在干旱地区的热干旱期间,土壤湿度主导了总初级生产率的变化
Ruonan Qiu1, Ge Han2, Siwei Li1
1School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China.
The Science of the total environment
|July 23, 2023
概括
土壤水分,而不是蒸汽压力赤字,是炎热干旱期间植被生产力的首要驱动因素. 了解这种关系对于预测生态系统对气候变化的反应至关重要.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 水文学的水文学
背景情况:
- 由于气候变化,热干旱的特点是高蒸汽压力赤字 (VPD) 和低土壤湿度 (SM),正在增加.
- 这些条件对陆地生态系统和人类社会构成重大风险,因为它们增加了对植被的水压力.
研究的目的:
- 研究高VPD和低SM对植被生产率 (总初级生产率 - GPP) 的个人影响.
- 解开合的气象因素对GPP的影响.
- 了解植被对美国西南部热干旱的反应.
主要方法:
- 使用的土壤湿度主动和被动 (SMAP) 卫星数据用于SM和GPP.
- 用VPD和其他气象变量的 gridMET数据.
- 应用了部分相关性分析,部分最小平方回归和捆绑方法来分离月度和每日GPP的变量影响.
主要成果:
- 发现土壤湿度异常对GPP异常的影响比VPD异常在每月和每日两种尺度上都更大.
- 随着土壤水含量异常的增加,GPP异常也随之增加,特别是在每日尺度上.
- VPD的增加对GPP异常没有显著影响.
- 土壤湿度是影响植物类型和干旱区GPP变化的主要因素,其次是VPD或最高温度.
结论:
- 土壤水分是决定热干旱条件下的植被生产力的关键因素.
- 研究结果强调了土壤水分在陆地生态系统对气候变化的适应性中的关键作用.
- 这项研究对于改善未来面临热干旱的干旱地区的植被生产率预测至关重要.
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