DOI: 10.1002/2016GL069416
论文题名: High atmospheric demand for water can limit forest carbon uptake and transpiration as severely as dry soil
作者: Sulman B.N. ; Roman D.T. ; Yi K. ; Wang L. ; Phillips R.P. ; Novick K.A.
刊名: Geophysical Research Letters
ISSN: 0094-8592
EISSN: 1944-8323
出版年: 2016
卷: 43, 期: 18 起始页码: 9686
结束页码: 9695
语种: 英语
英文关键词: drought
; eddy covariance
; photosynthesis
; soil moisture
; transpiration
; vapor pressure deficit
Scopus关键词: Carbon
; Carbon dioxide
; Drought
; Hydrostatic pressure
; Photosynthesis
; Soil moisture
; Soils
; Transpiration
; Climatic warming
; Eddy covariance
; Eddy covariance measurements
; Forest carbons
; Penman-Monteith equations
; Potential transpiration
; Soil water content
; Vapor pressure deficit
; Forestry
英文摘要: When stressed by low soil water content (SWC) or high vapor pressure deficit (VPD), plants close stomata, reducing transpiration and photosynthesis. However, it has historically been difficult to disentangle the magnitudes of VPD compared to SWC limitations on ecosystem-scale fluxes. We used a 13 year record of eddy covariance measurements from a forest in south central Indiana, USA, to quantify how transpiration and photosynthesis respond to fluctuations in VPD versus SWC. High VPD and low SWC both explained reductions in photosynthesis relative to its long-term mean, as well as reductions in transpiration relative to potential transpiration estimated with the Penman-Monteith equation. Flux responses to typical fluctuations in SWC and VPD had similar magnitudes. Integrated over the year, VPD fluctuations accounted for significant reductions of GPP in both nondrought and drought years. Our results suggest that increasing VPD under climatic warming could reduce forest CO2 uptake regardless of changes in SWC. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84990187877&doi=10.1002%2f2016GL069416&partnerID=40&md5=de37da79645b2dac12c7a9f514e1d43d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9555
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Public and Environmental Affairs, Indiana University, Bloomington, IN, United States
Recommended Citation:
Sulman B.N.,Roman D.T.,Yi K.,et al. High atmospheric demand for water can limit forest carbon uptake and transpiration as severely as dry soil[J]. Geophysical Research Letters,2016-01-01,43(18).