在不同的大气和土壤干旱条件下,触发值及其植被产量损失的动态
Chengyun Wang1, Jie Chen1, Lihua Xiong1
1State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan, Hubei 430072, PR China.
The Science of the total environment
|July 31, 2024
概括
土壤干旱对植被生产的威胁比大气干旱更大. 了解这些干旱触发值对于管理植被风险和水资源至关重要.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 环境科学 环境科学
背景情况:
- 大气和土壤干旱限制了植被生长和碳捕获.
- 在不同的干旱条件下,植物产量损失的关键触发值仍然不清楚.
研究的目的:
- 在大气和土壤干旱下调查植被产量损失的触发值.
- 分析这些触发值的动态和原因.
- 为干旱风险管理和水分配提供指导.
主要方法:
- 使用了Copula和贝叶斯方程框架.
- 模拟总初级产量,土壤湿度和蒸汽压力赤字 (1961-2018) 使用动态全球植被模型.
- 采用随机森林模型来探索值变化的驱动因素.
主要成果:
- 土壤干旱比大气干旱更严重地影响总初级生产,影响更大面积,损害概率更高.
- 与中国西部相比,在中国东部观察到更高的风险概率和更低的干旱触发值.
- 干旱触发值从1961年至2018年普遍下降,受二氧化碳施肥和温度变化的影响.
结论:
- 土壤干旱对植被生产的压力比大气干旱更大.
- 气候变化因素,如气温上升和二氧化碳受精效应的改变,调节干旱耐受性和触发值.
- 研究结果为在日益严重的干旱条件下对生态管理和水资源优化提供了关键的见解.
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