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中国西南地区一个原生亚热带常绿阔叶林的水分利用效率。

Water use efficiency in a primary subtropical evergreen forest in Southwest China.

机构信息

Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303, China.

Global Change Ecology Group, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303, China.

出版信息

Sci Rep. 2017 Feb 20;7:43031. doi: 10.1038/srep43031.

DOI:10.1038/srep43031
PMID:28216656
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5316949/
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 ~2.28 to 2.68 g C kg HO. The multiyear average WUE was 2.48 ± 0.17 (mean ± standard deviation) g C kg HO. 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 HO in the early morning and 4.6 g C kg HO in the evening. WUE in the dry season reached 3.1 g C kg HO in the early morning and 2.7 g C kg HO 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.

摘要

我们使用五年（2009-2013 年）连续涡度相关测量数据（GPP 和 ET）来计算水分利用效率（WUE），这些数据是在中国西南部的一个亚热带常绿阔叶林获得的。年度平均 WUE 呈现出从 2009 年到 2013 年的下降趋势，范围从~2.28 到 2.68g C kg H2O。多年平均 WUE 为 2.48±0.17（平均值±标准偏差）g C kg H2O。由于 GPP 的下降幅度小于 ET，因此在最干旱的年份（2009 年）WUE 大幅增加。在日尺度上，湿季 WUE 在清晨达到 5.1g C kg H2O，傍晚达到 4.6g C kg H2O。在旱季，清晨达到 3.1g C kg H2O，傍晚达到 2.7g C kg H2O。在叶片展叶阶段，WUE 的变化可以用与水分有关的变量（相对湿度（RH）、100cm 处的土壤含水量（SWC_100））、太阳辐射和绿指数（Sgreen）来适当解释。这些结果表明 WUE 在不同时间尺度上有很大的变化，突出了个别地点特征的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/4946ec13c4bd/srep43031-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/cc7de75730d9/srep43031-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/4b3deb3fc856/srep43031-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/0f86fe22b841/srep43031-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/b46832875159/srep43031-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/8edf70826509/srep43031-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/6885a2877639/srep43031-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/4946ec13c4bd/srep43031-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/cc7de75730d9/srep43031-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/4b3deb3fc856/srep43031-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/0f86fe22b841/srep43031-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/b46832875159/srep43031-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/8edf70826509/srep43031-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/6885a2877639/srep43031-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/75ae/5316949/4946ec13c4bd/srep43031-f7.jpg

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