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生态系统用水效率对高山草原土壤水的值反应

Tingting Li¹, Dashuan Tian¹, Yicheng He²

¹Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the total environment

|November 7, 2023

概括

生态系统的用水效率 (WUE) 不线性地对土壤水作出反应,并确定了最佳值. 极端降水可能会改变这种平衡,影响高山草原的碳和水循环.

科学领域:

生态生态学生态生态学
环境科学环境科学
气候科学气候科学

背景情况:

生态系统的用水效率 (WUE) 与碳吸收 (GEP) 和水损失 (Tr/ET) 有关.
对于WUE对不同降水,特别是极端事件的反应,还没有完全理解.
之前的研究表明,WUE随着降水量增加而下降,但非线性不清楚.

研究的目的:

研究生态系统WUE对土壤水变化的非线性反应.
确定阿尔卑斯山草原中WUE的最佳土壤水值.
了解极端降水事件如何影响WUE和碳水合.

主要方法:

在阿尔卑斯山草原进行了一项为期5年的降水减半实验.
年间降水波动造成了广泛的土壤和水的状况.
分析了对土壤水的反应WUE (WUE_Tr和WUE_ET) 的二次模式.

主要成果:

生态系统WUE表现出对土壤水的一致的二次反应,最佳值在25.0-28.4%之间.
在最佳值以下,增加的土壤水增加了WUE;在此以上,WUE下降了.
植物生物学因素对整个研究范围的生态系统WUE的影响最小.

结论:

这项研究揭示了WUE生态系统的非线性关系和最佳水值.
未来极端降水事件可能会超过这些值,改变高山草原的碳和水流动力学.
了解这些门对于预测生态系统对气候变化的反应至关重要.

关键词:

阿尔卑斯山草原的草地生态系统的用水效率使用效率.蒸发转化是指蒸发转化.生态系统生产率总值透气透气透气水位的水位值.

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