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在过去的三十年中,植被和干旱之间的联系正在减少

Delong Li¹, Li An^1,2, Shuai Zhong¹

¹Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.

Global change biology

|January 26, 2024

概括

随着时间的推移,植被对干旱变得越来越敏感. 虽然在全球范围内合减少了,但水多余地区现在面临着更高的干旱风险,影响未来的植被生存.

科学领域:

环境科学环境科学
气候变化研究气候变化研究
生态生态学生态生态学

背景情况:

干旱是植被死亡的主要原因,未来的气候变化预计将加剧这种影响.
目前用于评估植被干旱关系的方法,如相关系数,忽视了最佳干旱时间尺度的关键因素.
了解植被在不同时间尺度下对干旱的敏感性,对于预测生态系统反应至关重要.

研究的目的:

调查了三十年来 (1982-2015) 植被和干旱之间不断变化的联系.
确定植被反应的最佳干旱时间表,并分析其全球趋势.
评估水资源短缺地区与水资源多余地区的植被干旱联系如何转变.

主要方法:

利用卫星衍生的长期规范差异植被指数 (NDVI) 数据.
使用标准化降雨-蒸发指数 (SPEI) 来表示干旱条件.
应用了最佳干旱时间尺度识别方法来分析植被干旱合变化.

主要成果:

观察到植物对不同干旱时间尺度的反应的全球增加.
在最佳时间范围内,植被和干旱之间的总体相关性从1982年到2015年下降.
缺水地区的水资源合减少显著,而水资源余地区的水资源合增加趋势,尽管最初的合较低.

结论:

在全球范围内,植被和干旱的结合动态发生了转变,过剩水资源的地区表现出更高的脆弱性.
大气中二氧化碳的增加可能是这些观察到的变化背后的驱动因素.
调查结果提供了对未来植被干旱风险和气候变化下的敏感性的关键见解,强调需要考虑最佳干旱时间表.

关键词:

干旱时间表.这是一个长期趋势.趋势归因趋势归因植被干旱的结合植物干旱的结合缺水区是指缺水地区.过剩水的地区.

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