气候变化领域集成服务门户(CCPortal): Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest

CCPortal

DOI	10.1088/1748-9326/ab2612
	Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest
	Jiang Y.; Still C.J.; Rastogi B.; Page G.F.M.; Wharton S.; Meinzer F.C.; Voelker S.; Kim J.B.
发表日期	2019
ISSN	17489318
卷号	14 期号:7
英文摘要	At the ecosystem scale, water-use efficiency (WUE) is defined broadly as the ratio of carbon assimilated to water evaporated by an ecosystem. WUE is an important aspect of carbon and water cycling and has been used to assess forest ecosystem responses to climate change and rising atmospheric CO2 concentrations. This study investigates the influence of meteorological and radiation variables on forest WUE by analyzing an 18 year (1998-2015) half-hourly time series of carbon and water fluxes measured with the eddy covariance technique in an old-growth conifer forest in the Pacific Northwest, USA. Three different metrics of WUE exhibit an overall increase over the period 1998-2007 mainly due to an increase in gross primary productivity (GPP) and a decrease in evapotranspiration (ET). However, the WUE metrics did not exhibit an increase across the period from 2008 to 2015 due to a greater reduction in GPP relative to ET. The strength of associations among particular meteorological variables and WUE varied with the scale of temporal aggregation used. In general, vapor pressure deficit and air temperature appear to control WUE at half-hourly and daily time scales, whereas atmospheric CO2 concentration was identified as the most important factor controlling monthly WUE. Carbon and water fluxes and the consequent WUE showed a weak correlation to the Standard Precipitation Index, while carbon fluxes were strongly dependent on the combined effect of multiple climate factors. The inferred patterns and controls on forest WUE highlighted have implications for improved understanding and prediction of possible adaptive adjustments of forest physiology in response to climate change and rising atmospheric CO2 concentrations. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	carbon and water fluxes; climatic change; drought; old-growth coniferous forest; Water-use efficiency
语种	英语
scopus关键词	Carbon; Carbon dioxide; Climate change; Drought; Ecosystems; Efficiency; Plants (botany); Water supply; Climatic changes; Coniferous forests; Eddy covariance technique; Gross primary productivity; Meteorological variables; Standard precipitation indices; Water flux; Water use efficiency; Forestry; Coniferophyta
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154489
作者单位	Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR, United States; Atmospheric Earth and Energy Division, Lawrence Livermore National Laboratory, Livermore, CA, United States; USDA Forest Service, Pacific Northwest Research Station, Corvallis, OR, United States; Department of Plants, Soils and Climate, Utah State University, Logan, UT, United States
推荐引用方式 GB/T 7714	Jiang Y.,Still C.J.,Rastogi B.,et al. Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest[J],2019,14(7).
APA	Jiang Y..,Still C.J..,Rastogi B..,Page G.F.M..,Wharton S..,...&Kim J.B..(2019).Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest.Environmental Research Letters,14(7).
MLA	Jiang Y.,et al."Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest".Environmental Research Letters 14.7(2019).