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降雨对土壤呼吸的影响取决于先前的土壤湿度

Yajing Han¹, Gangsheng Wang¹, Lihua Xiong¹

¹State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China; Institute for Water-Carbon Cycles and Carbon Neutrality, School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China.

The Science of the total environment

|April 3, 2024

概括

在温带森林的生长季节,降雨可能会抑制土壤呼吸 (Rs),尤其是在土壤已经潮湿的时候. 先前的土壤湿度是影响这种反应的关键因素,改善了生态系统模型的预测.

科学领域:

生态生态学生态生态学
环境科学环境科学
土壤科学土壤科学

背景情况:

气候变化影响降雨模式,影响土壤呼吸 (Rs) 和碳储存.
了解Rs对降雨反应的驱动因素至关重要,但有限.

研究的目的:

为了调查Rs对降雨事件的反应的方向和大小.
确定温带森林生态系统中RS反应的关键决定因素.
评估先前的土壤湿度在调节卢比的作用.

主要方法:

对10年 (2004-2013) 的土壤呼吸和相关环境变量数据集的分析.
识别和分析了368个降雨事件.
统计建模以确定降雨量和土壤湿度对卢比的影响.

主要成果:

在生长季节的最佳和潮湿的土壤条件下,降雨抑制了Rs.
在非生长季节,降雨对卢比的影响很小.
之前的土壤湿度 (R ² = 0.37) 是生长季节的更强的预测因素,比降雨量 (R ² <0.01) 更强的预测因素.
包括先前的土壤湿度,提高了Rs的解释力 (R ²),从0.09变为0.45.

结论:

土壤呼吸对降雨的反应高度依赖于先前的土壤水分,特别是在生长季节.
先前的土壤湿度显著影响了下雨后的Rs变化的大小和方向.
将先行土壤湿度纳入生态系统模型可以提高预测准确性并减少不确定性.

关键词:

之前的土壤湿度土壤湿度.碳循环是一个碳循环.环境因素环境因素降雨量降雨量降雨量降雨事件降雨事件土壤呼吸系统土壤呼吸系统

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