How can terracing impact on soil moisture variation in China? A meta-analysis
How can terracing impact on soil moisture variation in China? A meta-analysis
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DOI：
10.1016/j.agwat.2019.105849
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发表时间：
2020-01-20
影响因子：
6.7
通讯作者：
Chen, Liding
中科院分区：
文献类型：
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作者：
Chen, Die;Wei, Wei;Chen, Liding
土壤水分在植被恢复和生态系统稳定中起着关键作用。梯田通过降低坡度和缩短坡长来调节水文过程。土壤水分变化对梯田化的响应强烈地受到土地利用、气候、地形和梯田特征的影响。在这项研究中，我们进行了荟萃分析，以检查土壤水分的反应，梯田在中国。对于中国的景观，梯田一般提高土壤水分12.9%。相对于其他梯田结构，水平沟表现出最大的节水效益，特别是在陡坡上。梯田在我国北方平原和南方干热河谷具有较高的蓄水效益。梯田蓄水效益随坡度的增加而增加，随土层深度的增加而降低。梯田结构间0-100 cm土壤水分差异较大，主要是由于不同微地形条件下蒸散量的差异所致。相比之下，土壤水分在100-200厘米的深度不同的土地利用类型，但不是梯田结构，只是因为根吸水总是不同的土地利用类型。在气候因子方面，降水对土壤水分变化起主导作用。
Soil moisture plays a key role in vegetation restoration and ecosystem stability. Terracing modulates hydrological processes by lowering the slope gradient and shortening the slope length. The response of soil moisture variation to terracing is strongly influenced by land use, climate, topography and terracing characteristics. In this study, we conducted a meta-analysis to examine the response of soil moisture to terracing in China. For China's landscapes, terracing generally improved the soil moisture by 12.9%. Relative to other terracing structures, level ditches showed the greatest water conservation benefits, especially on steep slopes. Terracing had higher water storage benefits in the northern plains and the southern dry-hot valleys of China. The benefits of water storage by terracing rose with increasing slope gradients above 15 degrees and fell with increasing depth of soil layers. Soil moisture in the 0-100 cm depth differed among terracing structures but not among land uses, mainly due to the differences in evapotranspiration under different micro-topographical conditions. In contrast, soil moisture at the depth of 100-200 cm differed among land use types but not among terracing structures, only because root water uptake always differed across land use types. Regarding climatic factors, precipitation played a dominant role in soil moisture variation.