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Are Northeastern U.S. forests vulnerable to extreme drought?

Ecological Processes 2017年第1期6卷 351-363页

作者： Adam P.Coble Matthew A.Vadeboncoeur Z.Carter Berry katie a.jennings Cameron D.McIntire John L.Campbell Lindsey E.Rustad Pamela H.Templer Heidi Asbjornsen Department of Natural Resources and the Environment University of New Hampshire56 College Rd.114 James HallDurhamNH 03824USA. Earth Systems Research Center University of New Hampshire8 College RoadDurhamNH 03824USA. Northern Research Station USDA Forest Service271 Mast RoadDurhamNH 03824USA. Department of Biology Boston University5 Cummington MallBostonMA 02215USA.

In the Northeastern U.S.,drought is expected to increase in frequency over the next century,and therefore,the responses of trees to drought are important to *** is recent debate about whether land-use change or moisture availability is the primary driver of changes in forest species composition in this *** argue that fire suppression from the early twentieth century to present has resulted in an increase in shade-tolerant and pyrophobic tree species that are drought intolerant,while others suggest precipitation variability as a major driver of species *** this debate,an emerging hypothesis is that mesophication and increases in the abundance of mesophytic genera(e.g.,Acer,Betula,and Fagus)resulted in forests that are more vulnerable to *** review examines the published literature and factors that contribute to drought vulnerability of Northeastern *** assessed two key concepts related to drought vulnerability,including drought tolerance(ability to survive drought)and sensitivity(short-term responses to drought),with a focus on Northeastern *** assessed drought-tolerance classifications for species,which revealed both consistencies and inconsistencies,as well as contradictions when compared to actual observations,such as higher mortality for drought-tolerant *** to drought sensitivity,recent work has focused on isohydric/anisohydric regulation of leaf water ***,based on the review of the literature,we conclude that drought sensitivity should be viewed in terms of multiple variables,including leaf abscission,stomatal sensitivity,turgor pressure,and dynamics of non-structural *** considered drought sensitive(e.g.,Acer,Betula,and Liriodendron)may actually be less prone to drought-induced mortality and dieback than previously considered because stomatal regulation and leaf abscission in these species are effective at preventing water potential from reaching critica

关键词： Acer Betula Drought sensitivity Drought tolerance Quercus Northeastern U.S. Temperate deciduous

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