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大规模的森林砍伐会导致中国干旱地区的土壤缺水危机吗?

Qiuming Wang¹, Hongyan Liu¹, Boyi Liang²

¹College of Urban and Environmental Sciences, and PKU Saihanba Station, Peking University, Beijing 100871, China.

Science bulletin

|March 19, 2024

概括

中国北部的大规模植树造林已经降低了土壤水含量 (SWC),特别是宽叶森林. 对水资源的长期影响取决于土地使用,树木类型和降水量.

科学领域:

环境科学环境科学
森林生态森林生态
水文学的水文学

背景情况:

干旱地区的森林植被面临着水消耗带来的挑战.
植被反可以抵消通过增加降水而导致的土壤水损失.
像中国自1978年以来的大规模造林项目,提供了重要的案例研究.

研究的目的:

为了评估土壤水含量 (SWC) 变化与植树树立的年龄在中国北部.
研究树种,降水和土地利用转换对SWC的影响.
为干旱地区的生态恢复和水资源管理政策提供信息.

主要方法:

对来自中国北部98个地点的1226个观测结果进行了系统的元分析.
对土壤含水量长期现场数据的分析.
基于树年龄,树种类型,降水量和土地使用历史,对植树造林影响的统计评估.

主要成果:

土壤中的水含量随着针叶树和宽叶树林的长期生长而显著减少.
宽叶森林的SWC下降率 (3.2毫米十年-1) 比针叶森林 (0.6毫米十年-1) 高.
在降水量较低的地区和从草原转化为森林时,SWC增加,特别是在针叶植物物种.

结论:

中国北部的森林植被可能导致长期的区域土壤水资源短缺.
植树对水资源的影响取决于以前的土地使用,树种和当地降水模式.
调查结果强调需要仔细考虑生态恢复政策和干旱地区的水资源管理.

关键词:

森林化是为了树林的复兴.干旱和半干旱地区.土地使用变化土地使用变化土壤水水土壤水水种植树木种植树木

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