Water use efficiency in a primary subtropical evergreen forest in Southwest China
| 论文编号: | |||||||||
| 作者: | Song QH | ||||||||
| 刊物名称: | Scientific Reports | ||||||||
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| 论文题目英文: | Water use efficiency in a primary subtropical evergreen forest in Southwest China | ||||||||
| 年: | Feb 2017 | ||||||||
| 卷: | 7 | ||||||||
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| 页: | 43031 | ||||||||
| 联系作者: | Song QH; Zhang YP | ||||||||
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| 影响因子: | 5.228 | ||||||||
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| 摘要: | 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 ~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. | ||||||||
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