Prolonged warming and drought modify belowground interactions for water among coexisting plants

Tree Physiology
Charlotte GrossiordNate G McDowell

Abstract

Understanding how climate alters plant-soil water dynamics, and its impact on physiological functions, is critical to improved predictions of vegetation responses to climate change. Here we analyzed how belowground interactions for water shift under warming and drought, and associated impacts on plant functions. In a semi-arid woodland, adult trees (piñon and juniper) and perennial grasses (blue grama) were exposed to warming and precipitation reduction. After 6 years of continuous treatment exposure, soil and plant water isotopic composition was measured to assess plant water uptake depths and community-level water source partitioning. Warming and drought modified plant water uptake depths. Under warming, contrasting changes in water sources between grasses and trees reduced belowground water source partitioning, resulting in higher interspecific competition for water. Under drought, shifts in trees and grass water sources to deeper soil layers resulted in the maintenance of the naturally occurring water source partitioning among species. Trees showed higher water stress, and reduced water use and photosynthesis in response to warming and drought. This case study demonstrates that neighboring plants shift their competitive int...Continue Reading

References

May 24, 1995·Biochimica Et Biophysica Acta·G Schatz
Mar 26, 2003·Tree Physiology·Paula C. JacksonFabio Causin
Nov 23, 2006·Rapid Communications in Mass Spectrometry : RCM·Romain L BarnardNina Buchmann
Jan 12, 2007·Oecologia·José Ignacio QuerejetaJuan José Jiménez-Osornio
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Jun 10, 2008·Ecological Applications : a Publication of the Ecological Society of America·A G WestJ R Ehleringer
Dec 31, 2015·Plant, Cell & Environment·Lucas A CernusakGraham D Farquhar
Sep 10, 2016·The New Phytologist·Charlotte GrossiordNate G McDowell
May 31, 2017·Plant, Cell & Environment·Charlotte GrossiordNate G McDowell

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Citations

Oct 8, 2021·Nature·Gonzalo Miguez-Macho, Ying Fan

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