Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13428 |
Relationships between individual-tree mortality and water-balance variables indicate positive trends in water stress-induced tree mortality across North America | |
Hember, Robbie A.1,2; Kurz, Werner A.2; Coops, Nicholas C.1 | |
2017-04-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Accounting for water stress-induced tree mortality in forest productivity models remains a challenge due to uncertainty in stress tolerance of tree populations. In this study, logistic regression models were developed to assess species- specific relationships between probability of mortality (P-m) and drought, drawing on 8.1 million observations of change in vital status (m) of individual trees across North America. Drought was defined by standardized (relative) values of soil water content (W-s,W- z) and reference evapotranspiration (ETr, z) at each field plot. The models additionally tested for interactions between the water-balance variables, aridity class of the site (AC), and estimated tree height (h). Considering drought improved model performance in 95 (80) per cent of the 64 tested species during calibration (cross-validation). On average, sensitivity to relative drought increased with site AC (i.e. aridity). Interaction between water-balance variables and estimated tree height indicated that drought sensitivity commonly decreased during early height development and increased during late height development, which may reflect expansion of the root system and decreasing whole-plant, leaf-specific hydraulic conductance, respectively. Across North America, predictions suggested that changes in the water balance caused mortality to increase from 1.1% yr(-1) in 1951 to 2.0% yr(-1) in 2014 (a net change of 0.9 +/- 0.3% yr(-1)). Interannual variation in mortality also increased, driven by increasingly severe droughts in 1988, 1998, 2006, 2007 and 2012. With strong confidence, this study indicates that water stress is a common cause of tree mortality. With weak-to-moderate confidence, this study strengthens previous claims attributing positive trends in mortality to increasing levels of water stress. This 'learn-as-we-go' approach - defined by sampling rare drought events as they continue to intensify - will help to constrain the hydraulic limits of dominant tree species and the viability of boreal and temperate forest biomes under continued climate change. |
英文关键词 | climate change drought drought-related tree mortality field plots forest productivity tree mortality water stress water stress-induced tree mortality |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396836800027 |
WOS关键词 | DROUGHT-INDUCED MORTALITY ; FOREST VEGETATION SIMULATOR ; PINYON-JUNIPER WOODLAND ; CANADIAN BOREAL FOREST ; CLIMATE-CHANGE ; DOUGLAS-FIR ; HYDRAULIC LIMITATION ; BRITISH-COLUMBIA ; LODGEPOLE PINE ; SCOTS PINE |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17869 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ British Columbia, Fac Forestry, 2424 Main Mall, Vancouver, BC V6T 1Z4, Canada; 2.Nat Resources Canada, Pacific Forestry Ctr, Canadian Forest Serv, 506 West Burnside Rd, Victoria, BC V8Z 1M5, Canada |
推荐引用方式 GB/T 7714 | Hember, Robbie A.,Kurz, Werner A.,Coops, Nicholas C.. Relationships between individual-tree mortality and water-balance variables indicate positive trends in water stress-induced tree mortality across North America[J]. GLOBAL CHANGE BIOLOGY,2017,23(4). |
APA | Hember, Robbie A.,Kurz, Werner A.,&Coops, Nicholas C..(2017).Relationships between individual-tree mortality and water-balance variables indicate positive trends in water stress-induced tree mortality across North America.GLOBAL CHANGE BIOLOGY,23(4). |
MLA | Hember, Robbie A.,et al."Relationships between individual-tree mortality and water-balance variables indicate positive trends in water stress-induced tree mortality across North America".GLOBAL CHANGE BIOLOGY 23.4(2017). |
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