气候变化领域集成服务门户(CCPortal): Implementing Plant Hydraulics in the Community Land Model, Version 5

CCPortal

DOI	10.1029/2018MS001500
	Implementing Plant Hydraulics in the Community Land Model, Version 5
	Kennedy D.; Swenson S.; Oleson K.W.; Lawrence D.M.; Fisher R.; Lola da Costa A.C.; Gentine P.
发表日期	2019
ISSN	19422466
起始页码	485
结束页码	513
卷号	11 期号:2
英文摘要	Version 5 of the Community Land Model (CLM5) introduces the plant hydraulic stress (PHS) configuration of vegetation water use, which is described and compared with the corresponding parameterization from CLM4.5. PHS updates vegetation water stress and root water uptake to better reflect plant hydraulic theory, advancing the physical basis of the model. The new configuration introduces prognostic vegetation water potential, modeled at the root, stem, and leaf levels. Leaf water potential replaces soil potential as the basis for stomatal conductance water stress, and root water potential is used to implement hydraulic root water uptake, replacing a transpiration partitioning function. Point simulations of a tropical forest site (Caxiuanã, Brazil) under ambient conditions and partial precipitation exclusion highlight the differences between PHS and the previous CLM implementation. Model description and simulation results are contextualized with a list of benefits and limitations of the new model formulation, including hypotheses that were not testable in previous versions of the model. Key results include reductions in transpiration and soil moisture biases relative to a control model under both ambient and exclusion conditions, correcting excessive dry season soil moisture stress in the control model. PHS implements hydraulic gradient root water uptake, which allows hydraulic redistribution and compensatory root water uptake and results in PHS utilizing a larger portion of the soil column to buffer shortfalls in precipitation. The new model structure, which bases water stress on leaf water potential, could have significant implications for vegetation-climate feedbacks, including increased sensitivity of photosynthesis to atmospheric vapor pressure deficit. ©2019. The Authors.
英文关键词	Brazil; Caxiuana; Community Land Model; plant hydraulics; root water uptake; throughfall exclusion; water stress
语种	英语
scopus关键词	Atmospheric structure; Forestry; Hydraulics; Soil moisture; Transpiration; Vegetation; Brazil; Caxiuana; Community land models; Root-water uptake; Throughfall exclusion; Water stress; Climate models; air-soil interaction; climate modeling; hydraulic property; root system; soil column; soil moisture; stomatal conductance; throughfall; transpiration; vegetation cover; water stress; Brazil
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156953
作者单位	Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States; National Center for Atmospheric Research, Boulder, CO, United States; Centro de Geociências, Universidade Federal do Pará, Belém, Pará, Brazil
推荐引用方式 GB/T 7714	Kennedy D.,Swenson S.,Oleson K.W.,et al. Implementing Plant Hydraulics in the Community Land Model, Version 5[J],2019,11(2).
APA	Kennedy D..,Swenson S..,Oleson K.W..,Lawrence D.M..,Fisher R..,...&Gentine P..(2019).Implementing Plant Hydraulics in the Community Land Model, Version 5.Journal of Advances in Modeling Earth Systems,11(2).
MLA	Kennedy D.,et al."Implementing Plant Hydraulics in the Community Land Model, Version 5".Journal of Advances in Modeling Earth Systems 11.2(2019).