Terrestrial carbon balance in a drier world: the effects of water availability in southwestern North America

Global Change Biology
Joel A BiedermanSean P Burns

Abstract

Global modeling efforts indicate semiarid regions dominate the increasing trend and interannual variation of net CO2 exchange with the atmosphere, mainly driven by water availability. Many semiarid regions are expected to undergo climatic drying, but the impacts on net CO2 exchange are poorly understood due to limited semiarid flux observations. Here we evaluated 121 site-years of annual eddy covariance measurements of net and gross CO2 exchange (photosynthesis and respiration), precipitation, and evapotranspiration (ET) in 21 semiarid North American ecosystems with an observed range of 100 - 1000 mm in annual precipitation and records of 4-9 years each. In addition to evaluating spatial relationships among CO2 and water fluxes across sites, we separately quantified site-level temporal relationships, representing sensitivity to interannual variation. Across the climatic and ecological gradient, photosynthesis showed a saturating spatial relationship to precipitation, whereas the photosynthesis-ET relationship was linear, suggesting ET was a better proxy for water available to drive CO2 exchanges after hydrologic losses. Both photosynthesis and respiration showed similar site-level sensitivity to interannual changes in ET among ...Continue Reading

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Citations

Nov 26, 2016·Scientific Reports·Xuanlong MaGuillermo Ponce-Campos
Mar 16, 2017·Global Change Biology·Joel A BiedermanMichael L Goulden
Apr 1, 2018·The New Phytologist·Benjamin D StockerSonia I Seneviratne
Apr 22, 2019·The New Phytologist·Jordane GavinetJean-Marc Limousin
Jan 9, 2020·Ecology Letters·Gregory E MaurerScott L Collins
Jan 22, 2020·Scientific Reports·Melanie R KazenelJennifer A Rudgers
Nov 11, 2020·Trends in Plant Science·Flurin BabstRichard L Peters
Aug 23, 2021·Environmental Science and Pollution Research International·Yayi NiuYulong Duan

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