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Selection: with tag vegetation [182 articles] 

 

Effects of fish in river food webs

  
Science, Vol. 250, No. 4982. (09 November 1990), pp. 811-814, https://doi.org/10.1126/science.250.4982.811

Abstract

Experimental manipulations of fish in a Northern California river during summer base flow reveal that they have large effects on predators, herbivores, and plants in river food webs. California roach and juvenile steelhead consume predatory insects and fish fry, which feed on algivorous chironomid larvae. In the presence of fish, filamentous green algae are reduced to low, prostrate webs, infested with chironomids. When the absence of large fish releases smaller predators that suppress chironomids, algal biomass is higher, and tall upright ...

 

Stay or go - How topographic complexity influences alpine plant population and community responses to climate change

  
Perspectives in Plant Ecology, Evolution and Systematics (November 2017), https://doi.org/10.1016/j.ppees.2017.09.008

Abstract

In the face of climate change, populations have two survival options − they can remain in situ and tolerate the new climatic conditions (“stay”), or they can move to track their climatic niches (“go”). For sessile and small-stature organisms like alpine plants, staying requires broad climatic tolerances, realized niche shifts due to changing biotic interactions, acclimation through plasticity, or rapid genetic adaptation. Going, in contrast, requires good dispersal and colonization capacities. Neither the magnitude of climate change experienced locally nor the ...

 

Early postfire vegetation recovery of Pinus brutia forests: effects offire severity, prefire stand age, and aspect

  
Turkish Journal of Agriculture and Forestry, Vol. 40 (2016), pp. 723-736, https://doi.org/10.3906/tar-1601-21

Abstract

Forests dominated by serotinous tree species are usually generalized to follow an autosuccessional model of postfire recovery. However, recent studies have suggested that prefire conditions, topography, and idiosyncrasies of the fire disturbance can have notable effects on how such forests respond to fire. We investigated the effects of fire severity, prefire stand age, and aspect (slope orientation) on the early postfire recovery of Pinus brutia forest. The study site was the area of 2008 Serik-Tasağıl Fire, one of the largest forest ...

 

Effects of slope angle and aspect on plant cover and species richness in a humid Mediterranean badland

  
Earth Surface Processes and Landforms, Vol. 39, No. 13. (October 2014), pp. 1705-1716, https://doi.org/10.1002/esp.3549

Abstract

Soil erosion is one of the most severe land degradation processes in the Mediterranean region. Although badlands occupy a relatively small fraction of the Mediterranean area, their erosion rates are very high. Many studies have investigated to what extent vegetation controls soil erosion rates. This study, however, deals with the impact of erosion on vegetation establishment. In semi-arid badlands of the Mediterranean, soil water availability constitutes the main limiting factor for vegetation development. As a consequence, south-facing slopes are typically less ...

 

How much does weather control fire size and intensity in the Mediterranean region?

  
Annales Geophysicae, Vol. 33, No. 7. (30 July 2015), pp. 931-939, https://doi.org/10.5194/angeo-33-931-2015

Abstract

This study investigates the synoptic conditions favorable to wildfires in the Mediterranean region, in terms of fire intensity and burnt area. As reported in the literature, Mediterranean large wildfires are associated with a blocking situation. However, this study shows the existence of two types of wildfires controlled by the blocking high intensity: (1) fast build-up of a weak blocking produces intense wildfires associated with strong winds which allow propagation over long distances; (2) longer build-up of strong blocking situation produces less ...

 

Size of wildfires in the Euro-Mediterranean region: observations and theoretical analysis

  
Natural Hazards and Earth System Science, Vol. 15, No. 6. (23 June 2015), pp. 1331-1341, https://doi.org/10.5194/nhess-15-1331-2015

Abstract

MODIS (Moderate Resolution Imaging Spectroradiometer) satellite observations of fire size and ERA-Interim meteorological reanalysis are used to derive a relationship between burnt area and wind speed over the Mediterranean region and Eastern Europe. The largest wildfire size does not show a strong response with respect to wind speed in Eastern Europe. In the Mediterranean, as intuitively expected, the burnt area associated with the largest wildfires is an increasing function of wind speed for moderate temperature anomalies. In situations of severe heatwaves, ...

 

Hydrologic regulation of plant rooting depth

  
Proceedings of the National Academy of Sciences, Vol. 114, No. 40. (03 October 2017), pp. 10572-10577, https://doi.org/10.1073/pnas.1712381114

Abstract

[Significance] Knowledge of plant rooting depth is critical to understanding plant-mediated global change. Earth system models are highly sensitive to this particular parameter with large consequences for modeled plant productivity, water–energy–carbon exchange between the land and the atmosphere, and silicate weathering regulating multimillion-year-timescale carbon cycle. However, we know little about how deep roots go and why. Accidental discoveries of >70-m-deep roots in wells and >20-m-deep roots in caves offer glimpses of the enormous plasticity of root response to its environment, but the ...

 

Factors explaining the spatial distribution of hillslope debris flows: a case study in the Flysch Sector of the Central Spanish Pyrenees

  
Mountain Research and Development, Vol. 22, No. 1. (1 February 2002), pp. 32-39, https://doi.org/10.1659/0276-4741(2002)022[0032:fetsdo]2.0.co;2

Abstract

The spatial distribution of 961 debris flows in the Upper Aragón and Gállego valleys (Central Spanish Pyrenees) was analyzed. Most were located in the Flysch Sector (with a colluvium mantle derived from strongly tectonically modified materials), between 1000 and 1400 m above sea level, on 25?35° gradients with sunny exposure. These gradients were either hillslopes covered by frequently burned scrubland, abandoned fields, or reforested land, confirming the influence of land use and disturbed landscapes on the occurrence of debris flows. ...

 

The concept of potential natural vegetation: an epitaph?

  
Journal of Vegetation Science, Vol. 21, No. 6. (December 2010), pp. 1172-1178, https://doi.org/10.1111/j.1654-1103.2010.01218.x

Abstract

We discuss the usefulness of the concept of Potential Natural Vegetation (PNV), which describes the expected state of mature vegetation in the absence of human intervention. We argue that it is impossible to model PNV because of (i) the methodological problems associated to its definition and (ii) the issues related to the ecosystems dynamics.We conclude that the approach to characterizing PNV is unrealistic and provides scenarios with limited predictive power. In places with a long-term human history, interpretations of PNV need ...

 

How do root and soil characteristics affect the erosion-reducing potential of plant species?

  
Ecological Engineering (August 2017), https://doi.org/10.1016/j.ecoleng.2017.08.001

Abstract

[Highlights] [::] Fibrous roots are very effective in reducing flow erosion rates in sandy soils. [::] Soil texture and bulk density affects the erosion-reducing potential of plant roots. [::] Increasing soil bulk density hampers the erosion-reducing potential of fine roots. [::] Increasing sand content hampers the erosion-reducing potential of tap roots. [Abstract] Plant roots can be very effective in stabilizing the soil against concentrated flow erosion. So far, most research on the erosion-reducing potential of plant roots was conducted on loamy soils. However susceptible to incisive erosion ...

 

Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought?

  
New Phytologist, Vol. 178, No. 4. (1 June 2008), pp. 719-739, https://doi.org/10.1111/j.1469-8137.2008.02436.x

Abstract

Severe droughts have been associated with regional-scale forest mortality worldwide. Climate change is expected to exacerbate regional mortality events; however, prediction remains difficult because the physiological mechanisms underlying drought survival and mortality are poorly understood. We developed a hydraulically based theory considering carbon balance and insect resistance that allowed development and examination of hypotheses regarding survival and mortality. Multiple mechanisms may cause mortality during drought. A common mechanism for plants with isohydric regulation of water status results from avoidance of drought-induced ...

 

Resprouting as a key functional trait: how buds, protection and resources drive persistence after fire

  
New Phytologist, Vol. 197, No. 1. (January 2013), pp. 19-35, https://doi.org/10.1111/nph.12001

Abstract

[Summary] Resprouting as a response to disturbance is now widely recognized as a key functional trait among woody plants and as the basis for the persistence niche. However, the underlying mechanisms that define resprouting responses to disturbance are poorly conceptualized. Resprouting ability is constrained by the interaction of the disturbance regime that depletes the buds and resources needed to fund resprouting, and the environment that drives growth and resource allocation. We develop a buds-protection-resources (BPR) framework for understanding resprouting in fire-prone ...

 

Fire as an evolutionary pressure shaping plant traits

  
Trends in Plant Science, Vol. 16, No. 8. (August 2011), pp. 406-411, https://doi.org/10.1016/j.tplants.2011.04.002

Abstract

Traits, such as resprouting, serotiny and germination by heat and smoke, are adaptive in fire-prone environments. However, plants are not adapted to fire per se but to fire regimes. Species can be threatened when humans alter the regime, often by increasing or decreasing fire frequency. Fire-adaptive traits are potentially the result of different evolutionary pathways. Distinguishing between traits that are adaptations originating in response to fire or exaptations originating in response to other factors might not always be possible. However, fire ...

 

Precipitation dominates fire occurrence in Greece (1900–2010): its dual role in fuel build-up and dryness

  
Natural Hazards and Earth System Science, Vol. 14, No. 1. (03 January 2014), pp. 21-32, https://doi.org/10.5194/nhess-14-21-2014

Abstract

Historical fire records and meteorological observations spanning over one century (1894–2010) were assembled in a database to collect long-term fire and weather data in Greece. Positive/negative events of fire occurrence on an annual basis were considered as the years where the annual values of the examined parameters were above (positive values) or below (negative values) the 95% confidence limits around the trend line of the corresponding parameter. To analyse the association of positive/negative events of fire occurrence with meteorological extremes, we ...

 

A global index for mapping the exposure of water resources to wildfire

  
Forests, Vol. 7, No. 1. (13 January 2016), 22, https://doi.org/10.3390/f7010022

Abstract

Wildfires are keystone components of natural disturbance regimes that maintain ecosystem structure and functions, such as the hydrological cycle, in many parts of the world. Consequently, critical surface freshwater resources can be exposed to post-fire effects disrupting their quantity, quality and regularity. Although well studied at the local scale, the potential extent of these effects has not been examined at the global scale. We take the first step toward a global assessment of the wildfire water risk (WWR) by presenting a ...

 

Remote sensing monitoring of land restoration interventions in semi-arid environments with a before–after control-impact statistical design

  
International Journal of Applied Earth Observation and Geoinformation, Vol. 59 (July 2017), pp. 42-52, https://doi.org/10.1016/j.jag.2017.02.016

Abstract

[Highlights] [::] A rapid, standardised and objective assessment of the biophysical impact of restoration interventions is proposed. [::] The intervention impact is evaluated by a before–after control-impact sampling design. [::] The method provides a statistical test of the no-change hypothesis and the estimation of the relative magnitude of the change. [::] The method is applicable to NDVI and other remote sensing-derived variables. [Abstract] Restoration interventions to combat land degradation are carried out in arid and semi-arid areas to improve vegetation cover and land productivity. Evaluating the success ...

 

Ancestral alliances: plant mutualistic symbioses with fungi and bacteria

  
Science, Vol. 356, No. 6340. (25 May 2017), eaad4501, https://doi.org/10.1126/science.aad4501

Abstract

[Taking a look at plant-microbe relationships] Ever since plants colonized land, they have evolved a range of mutualistic associations with bacteria and fungi. Indeed, such associations were probably required for plants to grow on harsh, nutrient-poor surfaces. Martin et al. review the spectrum of plant-microbe symbioses and their evolution, including evidence from the Rhynie Chert of the Devonian period and modern associations. Surprisingly, diverse functional plant-microbial symbioses have several common conserved features, including signaling pathways, immune evasion, and root development. [Structured Abstract] [::Background] Among the ...

 

Linking plant strategies and plant traits derived by radiative transfer modelling

  
Journal of Vegetation Science (12 April 2017), https://doi.org/10.1111/jvs.12525

Abstract

[Question] Do spatial gradients of plant strategies correspond to patterns of plant traits obtained from a physically based model and hyperspectral imagery? It has previously been shown that reflectance can be used to map plant strategies according to the established CSR scheme. So far, these approaches have been based on empirical links and lacked transferability. Therefore, we test if physically based derivations of plant traits may help in finding gradients in traits that are linked to strategies. [Location] A raised bog and minerotrophic fen ...

 

Hybrid incompatibility caused by an epiallele

  
Proceedings of the National Academy of Sciences, Vol. 114, No. 14. (04 April 2017), pp. 3702-3707, https://doi.org/10.1073/pnas.1700368114

Abstract

[Significance] Deleterious mutations in different copies of a duplicated gene pair have the potential to cause hybrid incompatibility between diverging subpopulations, contributing to reproductive isolation and speciation. This study demonstrates a case of epigenetic gene silencing rather than pseudogene creation by mutation, contributing to a lethal gene combination on hybridization of two ecotypes of Arabidopsis thaliana. Our findings provide direct evidence that naturally occurring epigenetic variation can contribute to incompatible hybrid genotypes, reducing gene flow between subtypes of the same species. [Abstract] Hybrid incompatibility ...

 

What causes large fires in Southern France

  
Forest Ecology and Management, Vol. 294 (April 2013), pp. 76-85, https://doi.org/10.1016/j.foreco.2012.06.055

Abstract

[Highlights] [::] 0.8% Of fires were larger than 100 ha but accounted for 71% of total burned area. [::] On the whole area, the main cause was arson. [::] Occurrence mainly linked to shrubland population, minor road, fall-spring drought. [::] Burned area linked to shrubland fall–winter rain, summer drought, unemployment. [::] The areas the most affected were located to the East on the Mediterranean coast. [Abstract] In Southern France, where most wildfires occur, the fire size has never exceeded 6744 ha since 1991, whereas ...

 

Evolutionary and plastic responses to climate change in terrestrial plant populations

  
Evolutionary Applications, Vol. 7, No. 1. (January 2014), pp. 123-139, https://doi.org/10.1111/eva.12112

Abstract

As climate change progresses, we are observing widespread changes in phenotypes in many plant populations. Whether these phenotypic changes are directly caused by climate change, and whether they result from phenotypic plasticity or evolution, are active areas of investigation. Here, we review terrestrial plant studies addressing these questions. Plastic and evolutionary responses to climate change are clearly occurring. Of the 38 studies that met our criteria for inclusion, all found plastic or evolutionary responses, with 26 studies showing both. These responses, ...

 

Effects of invasive alien plants on fire regimes

  
BioScience, Vol. 54, No. 7. (2004), pp. 677-688, https://doi.org/10.1641/0006-3568(2004)054[0677:eoiapo]2.0.co;2

Abstract

Plant invasions are widely recognized as significant threats to biodiversity conservation worldwide. One way invasions can affect native ecosystems is by changing fuel properties, which can in turn affect fire behavior and, ultimately, alter fire regime characteristics such as frequency, intensity, extent, type, and seasonality of fire. If the regime changes subsequently promote the dominance of the invaders, then an invasive plant–fire regime cycle can be established. As more ecosystem components and interactions are altered, restoration of preinvasion conditions becomes more ...

 

The effects of air pollutants on vegetation and the role of vegetation in reducing atmospheric pollution

  
In The Impact of Air Pollution on Health, Economy, Environment and Agricultural Sources (26 September 2011), pp. 241-280, https://doi.org/10.5772/17660
edited by Mohamed Khallaf

Abstract

[Excerpt: Introduction] The main air pollutants are represented by gases forms, particles in suspension, different ionizing radiation and noise. [\n] gases forms are: oxidized and reduced forms of carbon (CO2, CO, CH4), of nitrogen (NO2, NO, N2O4, NH3, NH4+), SO2, O3, C6H6 vapours, Hg, volatile phenols, Cl2, etc. [\n] The particulate forms are: PM10 and PM2.5 particulate matter, heavy metals with toxic effect (Pb, Ni, Cd, As), polycyclic aromatic hydrocarbons PAHs, etc. [\n] Atmospheric pollutants have a negative effect on the plants; they can ...

 

No saturation in the accumulation of alien species worldwide

  
Nature Communications, Vol. 8 (15 February 2017), 14435, https://doi.org/10.1038/ncomms14435

Abstract

Although research on human-mediated exchanges of species has substantially intensified during the last centuries, we know surprisingly little about temporal dynamics of alien species accumulations across regions and taxa. Using a novel database of 45,813 first records of 16,926 established alien species, we show that the annual rate of first records worldwide has increased during the last 200 years, with 37% of all first records reported most recently (1970–2014). Inter-continental and inter-taxonomic variation can be largely attributed to the diaspora of ...

 

Strengthening protected areas for biodiversity and ecosystem services in China

  
Proceedings of the National Academy of Sciences, Vol. 114, No. 7. (14 February 2017), pp. 1601-1606, https://doi.org/10.1073/pnas.1620503114

Abstract

[Significance] Following severe environmental degradation from rapid economic development, China is now advancing policies to secure biodiversity and ecosystem services. We report the first nationwide assessment, showing that protected areas (PAs) are not well delineated to protect either biodiversity or key ecosystem services. This serious deficiency exists in many countries. We propose creating a national park system in China to help guide development along a path of green growth, improving the well-being of both people and nature. This involves establishing new, strictly ...

 

Spatial vegetation patterns and imminent desertification in Mediterranean arid ecosystems

  
Nature, Vol. 449, No. 7159. (13 September 2007), pp. 213-217, https://doi.org/10.1038/nature06111

Abstract

Humans and climate affect ecosystems and their services1, which may involve continuous and discontinuous transitions from one stable state to another2. Discontinuous transitions are abrupt, irreversible and among the most catastrophic changes of ecosystems identified1. For terrestrial ecosystems, it has been hypothesized that vegetation patchiness could be used as a signature of imminent transitions3, 4. Here, we analyse how vegetation patchiness changes in arid ecosystems with different grazing pressures, using both field data and a modelling approach. In the modelling approach, ...

 

A review of the combination among global change factors in forests, shrublands and pastures of the Mediterranean Region: beyond drought effects

  
Global and Planetary Change, Vol. 148 (January 2017), pp. 42-54, https://doi.org/10.1016/j.gloplacha.2016.11.012

Abstract

[Highlights] [::] Different global change factors combine causing unprecedented ecological effects. [::] Much more complex interactions arise when combinations occur together. [::] Drought should be considered when designing and applying management policies. [::] Conserving Mediterranean terrestrial ecosystems is a collective effort. [Abstract] Climate change, alteration of atmospheric composition, land abandonment in some areas and land use intensification in others, wildfires and biological invasions threaten forests, shrublands and pastures all over the world. However, the impacts of the combinations between global change factors are not well understood despite ...

 

Temperature extremes: effect on plant growth and development

  
Weather and Climate Extremes, Vol. 10, Part A (2015), pp. 4-10, https://doi.org/10.1016/j.wace.2015.08.001

Abstract

Temperature is a primary factor affecting the rate of plant development. Warmer temperatures expected with climate change and the potential for more extreme temperature events will impact plant productivity. Pollination is one of the most sensitive phenological stages to temperature extremes across all species and during this developmental stage temperature extremes would greatly affect production. Few adaptation strategies are available to cope with temperature extremes at this developmental stage other than to select for plants which shed pollen during the cooler ...

 

Potential impact of climatic change on the distribution of forest herbs in Europe

  
Ecography, Vol. 27, No. 3. (June 2004), pp. 366-380, https://doi.org/10.1111/j.0906-7590.2004.03823.x

Abstract

The aim of this study is to evaluate the possible consequences of climate change on a representative sample of forest herbs in Europe. A fuzzy climatic envelope was used to predict the location of suitable climatic conditions under two climatic change scenarios. Expected consequences in terms of lost and gained range size and shift in distribution for 26 forest herbs were estimated. These results were combined in an Index of Predicted Range Change for each species. Finally, the effects of habitat ...

 

Modelling potential impacts of climate change on the bioclimatic envelope of species in Britain and Ireland

  
Global Ecology and Biogeography, Vol. 11, No. 6. (November 2002), pp. 453-462, https://doi.org/10.1111/j.1466-8238.2002.00304.x

Abstract

[Aim] Climate change has the potential to have significant impacts on the distribution of species and on the composition of habitats. This paper identifies the potential changes in the future distribution of species under the UKCIP98 climate change scenarios, in order that such changes can be taken into account in conservation management. [Location] The model was applied to Britain and Ireland. [Methods] A model based on an artificial neural network was used to predict the changing bioclimate envelopes of species in Britain and ...

 

Complex responses to global change at alpine treeline

  
Physical Geography, Vol. 22, No. 4. (1 July 2001), pp. 333-342, https://doi.org/10.1080/02723646.2001.10642747

Abstract

A focus of geography is the study of complexity: we include many interacting processes when we study places. Another view of complexity in geography is that complex pattern, in particular spatial pattern, can arise from few or simple interactions, if they are nonlinear. Environmental responses to global change are likely to be nonlinear and thus complex. Shifts in ecotones–the boundaries of vegetation types or biomes–may be indicative of such complex response to global change. One reason for expecting nonlinearity is that ...

 

The human dimension of fire regimes on Earth

  
Journal of Biogeography, Vol. 38, No. 12. (2011), pp. 2223-2236, https://doi.org/10.1111/j.1365-2699.2011.02595.x

Abstract

Humans and their ancestors are unique in being a fire-making species, but ‘natural’ (i.e. independent of humans) fires have an ancient, geological history on Earth. Natural fires have influenced biological evolution and global biogeochemical cycles, making fire integral to the functioning of some biomes. Globally, debate rages about the impact on ecosystems of prehistoric human-set fires, with views ranging from catastrophic to negligible. Understanding of the diversity of human fire regimes on Earth in the past, present and future remains rudimentary. ...

 

Sensitivity of burned area in Europe to climate change, atmospheric CO2 levels, and demography: a comparison of two fire-vegetation models

  
Journal of Geophysical Research: Biogeosciences, Vol. 120, No. 11. (1 November 2015), pp. 2256-2272, https://doi.org/10.1002/2015jg003036

Abstract

Global environmental changes and human activity influence wildland fires worldwide, but the relative importance of the individual factors varies regionally and their interplay can be difficult to disentangle. Here we evaluate projected future changes in burned area at the European and sub-European scale, and we investigate uncertainties in the relative importance of the determining factors. We simulated future burned area with LPJ-GUESS-SIMFIRE, a patch-dynamic global vegetation model with a semi-empirical fire model, and LPJmL-SPITFIRE, a dynamic global vegetation model with a ...

 

Forecasting the outbreak of moorland wildfires in the English Peak District

  
Journal of Environmental Management, Vol. 90, No. 8. (25 June 2009), pp. 2642-2651, https://doi.org/10.1016/j.jenvman.2009.02.011

Abstract

Warmer, drier summers brought by climate change increase the potential risk of wildfires on the moorland of the Peak District of northern England. Fires are costly to fight, damage the ecosystem, harm water catchments, cause erosion scars and disrupt transport. Fires release carbon dioxide to the atmosphere. Accurate forecasts of the timing of fires help deployment of fire fighting resources. A probit model is used to assess the chance of fires at different times of the year, days of the week ...

 

The sensitivity of global wildfires to simulated past, present, and future lightning frequency

  
Journal of Geophysical Research: Biogeosciences, Vol. 119, No. 3. (March 2014), pp. 312-322, https://doi.org/10.1002/2013jg002502

Abstract

In this study, components of the Max Planck Institute Earth System Model were used to explore how changes in lightning induced by climate change alter wildfire activity. To investigate how climate change alters global flash frequency, simulations with the atmospheric general circulation model ECHAM6 were performed for the time periods preindustrial, present-day, and three future scenarios. The effect of changes in lightning activity on fire occurrence was derived from simulations with the land surface vegetation model JSBACH. Global cloud-to-ground lightning activity ...

 

Measuring moisture content in living chaparral: a field user's manual

  
Vol. PSW-036 (1979)

Abstract

This manual standardizes procedures for determining the moisture content of living chaparral for use in a proposed statewide system of monitoring living fuel moisture. The manual includes a comprehensive examination of fuel moisture variations in California chaparral, and describes techniques for sampling these variations. Equipment needed to sample and determine living fuel moisture is discussed. Detailed procedures for collecting living fuel samples and processing the samples for moisture content are provided. [Excerpt: Procedures] Of the several methods available for determining the moisture con- tent ...

 

Estimating live fine fuels moisture content using meteorologically-based indices

  
International Journal of Wildland Fire, Vol. 10, No. 2. (2001), pp. 223-240, https://doi.org/10.1071/WF01022

Abstract

Field measurements of moisture content of several fine fuels (shrub vegetation and live foliage) were performed in Central Portugal and in Catalunya (NE Spain) for 1–10 years. Seasonal and interannual variation of live fine fuels of several species in two regions of the Iberian Peninsula are analysed. The species were grouped in three sets according to their relatively high, intermediate or low seasonal variability. Meteorological data from nearby stations were collected in each study area and used in the evaluation of ...

 

Remotely sensed Live Fuel Moisture retrieval using Radiative Transfer Models

  
(2012)

Abstract

La presente tesis doctoral ha tenido como objetivo principal el estimar el contenido de humedad de la vegetación viva (LFMC) en el contexto de la evaluación del riesgo de incendio. El área de estudio ha sido la comprendida por la región Mediterránea y Eurosiberiana, ambas localizadas en el territorio peninsular español. La teledetección espacial es una herramienta útil y prometedora para estimar parámetros biofísicos. Por lo tanto, las imágenes de satélite procedentes del programa MODIS (MODerate-resolution Imaging Spectroradiometer) a 500m ...

 

Comparison between energy balance and mass balance models for actual evapotranspiration assessment

  
In Remote Sensing for Agriculture, Ecosystems, and Hydrology XI, Vol. 7472 (2009), 747212, https://doi.org/10.1117/12.830229

Abstract

The assessment of the water needs for a specific crop has a fundamental importance in the management of water resources. The application of empirical models able to retrieve estimates of the actual evapotranspiration (ETa) to assess the need for water could give a valid tool for the planning of water supply, avoiding unnecessary water losses. In this context, two independent models for estimating actual evapotranspiration were compared. The first model is based on an energy balance and uses remotely sensed data ...

 

Global fire size distribution is driven by human impact and climate

  
Global Ecology and Biogeography, Vol. 24, No. 1. (January 2015), pp. 77-86, https://doi.org/10.1111/geb.12246

Abstract

[Aim] In order to understand fire's impacts on vegetation dynamics, it is crucial that the distribution of fire sizes be known. We approached this distribution using a power-law distribution, which derives from self-organized criticality theory (SOC). We compute the global spatial variation in the power-law exponent and determine the main factors that explain its spatial distribution. [Location] Global, at 2° grid resolution. [Methods] We use satellite-derived MODIS burned-area data (MCD45) to obtain global individual fire size data for 2002–2010, grouped together for each 2° grid. A ...

 

Recent advances and remaining uncertainties in resolving past and future climate effects on global fire activity

  
Current Climate Change Reports, Vol. 2, No. 1. (2016), pp. 1-14, https://doi.org/10.1007/s40641-016-0031-0

Abstract

Fire is an integral component of the Earth system that will critically affect how terrestrial carbon budgets and living systems respond to climate change. Paleo and observational records document robust positive relationships between fire activity and aridity in many parts of the world on interannual to millennial timescales. Observed increases in fire activity and aridity in many areas over the past several decades motivate curiosity as to the degree to which anthropogenic climate change will alter global fire regimes and subsequently ...

 

Climate change and the eco-hydrology of fire: will area burned increase in a warming western U.S.?

  
Ecological Applications (August 2016), https://doi.org/10.1002/eap.1420

Abstract

Wildfire area is predicted to increase with global warming. Empirical statistical models and process-based simulations agree almost universally. The key relationship for this unanimity, observed at multiple spatial and temporal scales, is between drought and fire. Predictive models often focus on ecosystems in which this relationship appears to be particularly strong, such as mesic and arid forests and shrublands with substantial biomass such as chaparral. We examine the drought-fire relationship, specifically the correlations between water-balance deficit and annual area burned, across ...

 

Social semantics: altruism, cooperation, mutualism, strong reciprocity and group selection

  
Journal of Evolutionary Biology, Vol. 20, No. 2. (1 March 2007), pp. 415-432, https://doi.org/10.1111/j.1420-9101.2006.01258.x

Abstract

From an evolutionary perspective, social behaviours are those which have fitness consequences for both the individual that performs the behaviour, and another individual. Over the last 43 years, a huge theoretical and empirical literature has developed on this topic. However, progress is often hindered by poor communication between scientists, with different people using the same term to mean different things, or different terms to mean the same thing. This can obscure what is biologically important, and what is not. The potential for ...

 

Plant responses to increasing CO2 reduce estimates of climate impacts on drought severity

  
Proceedings of the National Academy of Sciences, Vol. 113, No. 36. (06 September 2016), pp. 10019-10024, https://doi.org/10.1073/pnas.1604581113

Abstract

[Significance] We show that the water savings that plants experience under high CO2 conditions compensate for much of the effect of warmer temperatures, keeping the amount of water on land, on average, higher than we would predict with common drought metrics, and with a different spatial pattern. The implications of plants needing less water under high CO2 reaches beyond drought prediction to the assessment of climate change impacts on agriculture, water resources, wildfire risk, and vegetation dynamics. [Abstract] Rising atmospheric CO2 will make Earth ...

 

Ecology: more is less

  
Nature, Vol. 537, No. 7618. (31 August 2016), pp. 42-42, https://doi.org/10.1038/537042a

Abstract

[Excerpt] Plants compete for the same resources, such as nutrients, light and water. Because these resources are often limited, the coexistence of plant species requires the creation of trade-offs in resource use. In this issue, Harpole et al. report that increasing a limited nutrient in grassland can eliminate these potential trade-offs, reducing overall species diversity (W. S. Harpole et al. Nature 537, 93–96; 2016). [\n] The authors considered 45 grassland sites across 6 continents, and measured species diversity in response to various ...

 

Size asymmetry of resource competition and the structure of plant communities

  
Journal of Ecology, Vol. 104, No. 4. (July 2016), pp. 899-910, https://doi.org/10.1111/1365-2745.12557

Abstract

Plant communities show two general responses to gradients of soil resources: a decrease in species richness at high levels of resource availability and an associated shift in species composition from small and slow-growing species to large and fast-growing species. Models attempting to explain these responses have usually focused on a single pattern and provided contradicting predictions concerning the underlying mechanisms. [\n] We use an extension of Tilman's resource competition model to investigate the hypothesis that both patterns may ...

 

Size asymmetry of resource competition and the structure of plant communities: commentary on DeMalach et al 2016

  
Journal of Ecology, Vol. 104, No. 4. (July 2016), pp. 911-912, https://doi.org/10.1111/1365-2745.12591

Abstract

[Excerpt] The hump-back relationship between diversity and productivity is one of the well-known patterns in ecology that have defied unequivocal explanation (Mittelbach et al. 2001; Šímová, Li & Storch 2013). While it has often been argued that the decline of species richness under high productivity is due to more intense competition, it has never been made fully clear why extinction under high productivity should be more likely compared to low productivity. DeMalach et al. (2016) present a simple and elegant explanation: it ...

 

Competition for light causes plant biodiversity loss after eutrophication

  
Science, Vol. 324, No. 5927. (30 April 2009), pp. 636-638, https://doi.org/10.1126/science.1169640

Abstract

Human activities have increased the availability of nutrients in terrestrial and aquatic ecosystems. In grasslands, this eutrophication causes loss of plant species diversity, but the mechanism of this loss has been difficult to determine. Using experimental grassland plant communities, we found that addition of light to the grassland understory prevented the loss of biodiversity caused by eutrophication. There was no detectable role for competition for soil resources in diversity loss. Thus, competition for light is a major mechanism of plant diversity ...

 

The International Plant Sentinel Network: a tool for regional and national plant protection organizations

  
EPPO Bulletin, Vol. 46, No. 1. (April 2016), pp. 156-162, https://doi.org/10.1111/epp.12283

Abstract

[Excerpt:Introduction] A 2011 global survey of botanic gardens and arboreta, which included 204 respondents from 146 institutes, revealed that the botanic garden community has the potential to play a significant role in safeguarding plant health. However, responding institutes cited a lack of available training, resources and coordination to support any such work (Kramer & Hird 2011). Since its launch in November 2013, the International Plant Sentinel Network (IPSN) has been working to provide this support and illustrate the usefulness of such a ...

 

Community genetics: resource addition has opposing effects on genetic and species diversity in a 150-year experiment

  
Ecology Letters, Vol. 12, No. 2. (February 2009), pp. 165-170, https://doi.org/10.1111/j.1461-0248.2008.01273.x

Abstract

We used the Park Grass Experiment, begun in 1856, to test alternative hypotheses about the relationship between genetic diversity and plant species diversity. The niche variation hypothesis predicts that populations with few interspecific competitors and hence broader niches are expected to contain greater genetic diversity. The coexistence hypothesis predicts that genetic diversity within species favours coexistence among species and therefore species and genetic diversity should be positively correlated. Amplified Fragment Length Polymorphism (AFLP) markers were used to measure the genetic diversity ...

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