globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13640
论文题名:
Reconciling seasonal hydraulic risk and plant water use through probabilistic soil–plant dynamics
作者: Feng X.; Dawson T.E.; Ackerly D.D.; Santiago L.S.; Thompson S.E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:9
起始页码: 3758
结束页码: 3769
语种: 英语
英文关键词: drought response ; plant hydraulic risk ; rainfall variability ; soil–plant feedback ; stochastic soil moisture dynamics
英文摘要: Current models used for predicting vegetation responses to climate change are often guided by the dichotomous needs to resolve either (i) internal plant water status as a proxy for physiological vulnerability or (ii) external water and carbon fluxes and atmospheric feedbacks. Yet, accurate representation of fluxes does not always equate to accurate predictions of vulnerability. We resolve this discrepancy using a hydrodynamic framework that simultaneously tracks plant water status and water uptake. We couple a minimalist plant hydraulics model with a soil moisture model and, for the first time, translate rainfall variability at multiple timescales – with explicit descriptions at daily, seasonal, and interannual timescales – into a physiologically meaningful metric for the risk of hydraulic failure. The model, parameterized with measured traits from chaparral species native to Southern California, shows that apparently similar transpiration patterns throughout the dry season can emerge from disparate plant water potential trajectories, and vice versa. The parsimonious set of parameters that captures the role of many traits across the soil–plant–atmosphere continuum is then used to establish differences in species sensitivities to shifts in seasonal rainfall statistics, showing that co-occurring species may diverge in their risk of hydraulic failure despite minimal changes to their seasonal water use. The results suggest potential shifts in species composition in this region due to species-specific changes in hydraulic risk. Our process-based approach offers a quantitative framework for understanding species sensitivity across multiple timescales of rainfall variability and provides a promising avenue toward incorporating interactions of temporal variability and physiological mechanisms into drought response models. © 2017 John Wiley & Sons Ltd
资助项目: X. F. was supported by the NOAA Climate and Global Change Postdoctoral Fellowship. S. E. T., D. D. A., and T. E. D. thank the NSF for supporting RAPID grant IOS 1441396. L. S. S. was supported by NSF grant 0817212 and 1548846 as well as Bureau of Land Management Project #61328. The authors would also like to thank William R. L. Anderegg and three anonymous reviewers for providing valuable feedback and suggestions.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60825
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Civil and Environmental Engineering, University of California, Berkeley, CA, United States; Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, Twin Cities, MN, United States; Department of Integrative Biology, University of California, Berkeley, CA, United States; Department of Environmental Sciences, Policy, and Management, University of California, Berkeley, CA, United States; Department of Botany & Plant Sciences, University of California, Riverside, CA, United States

Recommended Citation:
Feng X.,Dawson T.E.,Ackerly D.D.,et al. Reconciling seasonal hydraulic risk and plant water use through probabilistic soil–plant dynamics[J]. Global Change Biology,2017-01-01,23(9)
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