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Increasing intrinsic water-use efficiency over the past 160 years does not stimulate tree growth in southeastern China

Journal article
Authors Guoyang Guo
Keyan Fang
Jinbao Li
Hans W. Linderholm
Dawen Li
Feifei Zhou
Zhipeng Dong
Yingjun Li
Lei Wang
Published in Climate Research
Volume 76
Issue 2
Pages 115-130
ISSN 0936577X
Publication year 2018
Published at Department of Earth Sciences
Pages 115-130
Language en
Links doi.org/10.3354/cr01526
Keywords Humid subtropical China, Intrinsic water-use efficiency, Pinus massoniana, Stable carbon isotope, Tree-ring
Subject categories Climate Research

Abstract

© 2018 Inter-Research. Understanding the responses of tree growth and intrinsic water-use efficiency (iWUE) to anthropogenic CO2 increase and climate warming provides important benchmarks for evaluating future forest dynamics under different scenarios of warming and CO2 changes. Relative to the short period of instrumental data of the past few decades, long-term tree-ring width and stable carbon isotopic (δ13C) data are invaluable in fully comprehending their interactions during the entire industrial era, since ~1850. Here, we present a tree-ring width chronology (1856 to 2015) and Δ13C series (1876-2015) of Pinus massoniana for Yongtai county of Fujian province, in humid subtropical China, a 'green island' relative to other dry subtropical areas of the world. Tree growth was limited by precipitation of the hydrological year (previous November to current October) (r = 0.568, p < 0.001), and the stable carbon isotope discrimination (Δ13C) was strongly correlated with relative humidity in September-October (r =-0.677, p < 0.001) of the current growing season. We found that the iWUE increased by 40.9% since 1876. Specifically, we found that the ci:ca ratio decreased during the study period whereas intercellular CO2 concentration (ci) increased. The negative relationship between basal area increment (BAI) and iWUE indicated that increasing iWUE may not lead to long-term enhancement of tree growth. Our results indicated a drought-induced limitation to tree growth in response to rising CO2, and that trees may mitigate the negative effects of a decrease in water availability through a reduction in stomatal conductance.

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