Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15729 |
Annual precipitation explains variability in dryland vegetation greenness globally but not locally | |
Anna M. Ukkola; Martin G. De Kauwe; Michael L. Roderick; Arden Burrell; Peter Lehmann; Andy J. Pitman | |
2021-06-22 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Dryland vegetation productivity is strongly modulated by water availability. As precipitation patterns and variability are altered by climate change, there is a pressing need to better understand vegetation responses to precipitation variability in these ecologically fragile regions. Here we present a global analysis of dryland sensitivity to annual precipitation variations using long-term records of normalized difference vegetation index (NDVI). We show that while precipitation explains 66% of spatial gradients in NDVI across dryland regions, precipitation only accounts for <26% of temporal NDVI variability over most (>75%) dryland regions. We observed this weaker temporal relative to spatial relationship between NDVI and precipitation across all global drylands. We confirmed this result using three alternative water availability metrics that account for water loss to evaporation, and growing season and precipitation timing. This suggests that predicting vegetation responses to future rainfall using space-for-time substitution will strongly overestimate precipitation control on interannual variability in aboveground growth. We explore multiple mechanisms to explain the discrepancy between spatial and temporal responses and find contributions from multiple factors including local-scale vegetation characteristics, climate and soil properties. Earth system models (ESMs) from the latest Coupled Model Intercomparison Project overestimate the observed vegetation sensitivity to precipitation variability up to threefold, particularly during dry years. Given projections of increasing meteorological drought, ESMs are likely to overestimate the impacts of future drought on dryland vegetation with observations suggesting that dryland vegetation is more resistant to annual precipitation variations than ESMs project. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
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/333670 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Anna M. Ukkola,Martin G. De Kauwe,Michael L. Roderick,et al. Annual precipitation explains variability in dryland vegetation greenness globally but not locally[J]. Global Change Biology,2021. |
APA | Anna M. Ukkola,Martin G. De Kauwe,Michael L. Roderick,Arden Burrell,Peter Lehmann,&Andy J. Pitman.(2021).Annual precipitation explains variability in dryland vegetation greenness globally but not locally.Global Change Biology. |
MLA | Anna M. Ukkola,et al."Annual precipitation explains variability in dryland vegetation greenness globally but not locally".Global Change Biology (2021). |
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