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title: Water use efficiency in a primary subtropical evergreen forest in Southwest China
author: Song, Qing-Hai;  Fei, Xue-Hai;  Zhang, Yi-Ping;  Sha, Li-Qing;  Liu, Yun-Tong;  Zhou, Wen-Jun;  Wu, Chuan-Sheng;  Lu, Zhi-Yun;  Luo, Kang;  Gao, Jin-Bo;  Liu, Yu-Hong
Issued Date: 2017
Abstract: We calculated water use efficiency (WUE) using measures of gross primary production (GPP) and evapotranspiration (ET) from five years of continuous eddy covariance measurements (2009-2013) obtained over a primary subtropical evergreen broadleaved forest in southwestern China. Annual mean WUE exhibited a decreasing trend from 2009 to 2013, varying from similar to 2.28 to 2.68 g C kg H2O-1. The multiyear average WUE was 2.48 +/- 0.17 (mean +/- standard deviation) g C kg H2O-1. WUE increased greatly in the driest year (2009), due to a larger decline in ET than in GPP. At the diurnal scale, WUE in the wet season reached 5.1 g C kg H2O-1 in the early morning and 4.6 g C kg H2O-1 in the evening. WUE in the dry season reached 3.1 g C kg H2O-1 in the early morning and 2.7 g C kg H2O-1 in the evening. During the leaf emergence stage, the variation of WUE could be suitably explained by water-related variables (relative humidity (RH), soil water content at 100 cm (SWC_100)), solar radiation and the green index (Sgreen). These results revealed large variation in WUE at different time scales, highlighting the importance of individual site characteristics.
Source: SCIENTIFIC REPORTS
Related URLs: 10.1038/srep43031
Appears in Collections:全球变化研究组_期刊论文

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全文许可: Creative Commons 署名-非商业性使用-相同方式共享 3.0

Recommended Citation:
Song, Qing-Hai,Fei, Xue-Hai,Zhang, Yi-Ping,et al. Water Use Efficiency In A Primary Subtropical Evergreen Forest In Southwest China[J]. Scientific Reports,2017,7(X):-.

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