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CR 76:115-130 (2018)  -  DOI:

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

Guoyang Guo1, Keyan Fang1,2,*, Jinbao Li3, Hans W. Linderholm2, Dawen Li1, Feifei Zhou1, Zhipeng Dong1, Yingjun Li1, Lei Wang1

1Institute of Geography, Key Laboratory of Humid Subtropical Eco-geographical Process (Ministry of Education), College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, PR China
2Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30 Gothenburg, Sweden
3Department of Geography, University of Hong Kong, Pokfulam, Hong Kong SAR
*Corresponding author:

ABSTRACT: 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.

KEY WORDS: Tree-ring · Stable carbon isotope · Intrinsic water-use efficiency · Pinus massoniana · Humid subtropical China

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Cite this article as: Guo G, Fang K, Li J, Linderholm HW and others (2018) Increasing intrinsic water-use efficiency over the past 160 years does not stimulate tree growth in southeastern China. Clim Res 76:115-130.

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