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Selection: Allen:CD [8 articles] 

Publications by author Allen:CD.
 

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 ...

 

Climate-induced forest dieback: an escalating global phenomenon?

  
Unasylva, Vol. 60, No. 231-232. (2009), pp. 43-49

Abstract

Forests, which today cover 30 percent of the world’s land surface (FAO, 2006), are being rapidly and directly transformed in many areas by the impacts of expanding human populations and economies. Less evident are the pervasive effects of ongoing climatic changes on the condition and status of forests around the world. Recent examples of drought and heat-related forest stress and dieback (defined here as tree mortality noticeably above usual mortality levels) are being documented from all forested continents, making it possible ...

 

Darcy's law predicts widespread forest mortality under climate warming

  
Nature Climate Change, Vol. 5, No. 7. (18 May 2015), pp. 669-672, https://doi.org/10.1038/nclimate2641

Abstract

Nature Climate Change | Letter Print Share/bookmark Darcy's law predicts widespread forest mortality under climate warming Nathan G. McDowell & Craig D. Allen Affiliations Contributions Corresponding author Nature Climate Change 5, 669–672 (2015) https://doi.org/10.1038/nclimate2641 Received 23 July 2014 Accepted 07 April ...

 

On underestimation of global vulnerability to tree mortality and forest die-off from hotter drought in the Anthropocene

  
Ecosphere, Vol. 6, No. 8. (August 2015), art129, https://doi.org/10.1890/es15-00203.1

Abstract

Patterns, mechanisms, projections, and consequences of tree mortality and associated broad-scale forest die-off due to drought accompanied by warmer temperatures—“hotter drought”, an emerging characteristic of the Anthropocene—are the focus of rapidly expanding literature. Despite recent observational, experimental, and modeling studies suggesting increased vulnerability of trees to hotter drought and associated pests and pathogens, substantial debate remains among research, management and policy-making communities regarding future tree mortality risks. We summarize key mortality-relevant findings, differentiating between those implying lesser versus greater levels of ...

 

Watering the forest for the trees: an emerging priority for managing water in forest landscapes

  
Frontiers in Ecology and the Environment, Vol. 11, No. 6. (08 August 2013), pp. 314-321, https://doi.org/10.1890/120209

Abstract

Widespread threats to forests resulting from drought stress are prompting a re-evaluation of priorities for water management on forest lands. In contrast to the widely held view that forest management should emphasize providing water for downstream uses, we argue that maintaining forest health in the context of a changing climate may require focusing on the forests themselves and on strategies to reduce their vulnerability to increasing water stress. Management strategies would need to be tailored to specific landscapes but could include ...

 

Regional vegetation die-off in response to global-change-type drought

  
Proceedings of the National Academy of Sciences, Vol. 102, No. 42. (10 October 2005), pp. 15144-15148, https://doi.org/10.1073/pnas.0505734102

Abstract

Future drought is projected to occur under warmer temperature conditions as climate change progresses, referred to here as global-change-type drought, yet quantitative assessments of the triggers and potential extent of drought-induced vegetation die-off remain pivotal uncertainties in assessing climate-change impacts. Of particular concern is regional-scale mortality of overstory trees, which rapidly alters ecosystem type, associated ecosystem properties, and land surface conditions for decades. Here, we quantify regional-scale vegetation die-off across southwestern North American woodlands in 2002-2003 in response to drought and ...

 

A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests

  
Forest Ecology and Management, Vol. 259, No. 4. (05 February 2010), pp. 660-684, https://doi.org/10.1016/j.foreco.2009.09.001

Abstract

Greenhouse gas emissions have significantly altered global climate, and will continue to do so in the future. Increases in the frequency, duration, and/or severity of drought and heat stress associated with climate change could fundamentally alter the composition, structure, and biogeography of forests in many regions. Of particular concern are potential increases in tree mortality associated with climate-induced physiological stress and interactions with other climate-mediated processes such as insect outbreaks and wildfire. Despite this risk, existing projections of tree mortality are ...

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Temperature as a potent driver of regional forest drought stress and tree mortality

  
Nature Climate Change, Vol. 3, No. 3. (30 September 2012), pp. 292-297, https://doi.org/10.1038/nclimate1693

Abstract

As the climate changes, drought may reduce tree productivity and survival across many forest ecosystems; however, the relative influence of specific climate parameters on forest decline is poorly understood. We derive a forest drought-stress index (FDSI) for the southwestern United States using a comprehensive tree-ring data set representing AD 1000–2007. The FDSI is approximately equally influenced by the warm-season vapour-pressure deficit (largely controlled by temperature) and cold-season precipitation, together explaining 82% of the FDSI variability. Correspondence between the FDSI and measures ...

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