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宁南黄土高原退耕还林(草)区包气带土壤水分运移特征及对降水的响应
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Journal Article
宁南黄土高原退耕还林(草)区包气带土壤水分运移特征及对降水的响应
2026
Overview
S152.7; [目的]研究退耕还林(草)条件下包气带土壤水变化特征及其对降水的响应.[方法]以宁南黄土丘陵地区退耕还林(草)条件下自然撂荒后的典型草地和未撂荒的农田为研究对象,基于2023年4-10月降水量与土壤含水率观测数据,分析包气带土壤水分运移特征及其对降水的响应.[结果]小雨事件对土壤补给的主要作用层在0～10 cm.而中雨事件对土壤补给的主要作用层在0～30 cm,中雨条件下农田与草地土壤水文特征均仅在10、30 cm产生了波动.农田和草地对降水事件的响应时间和响应程度均存在明显差异,农田土壤平均含水率最大值出现在0～30 cm土层,而草地出现在0～10 cm,降水对包气带土壤水的补给作用随着土层深度的增加而减弱.根据水量平衡分析可知,草地的蒸散发量(ET)远低于农田,但其深层渗漏量高于农田,退耕还林(草)有助于土壤深层包气带土壤水的入渗补给.[结论]本研究解释了宁南山区生态系统水分运动规律,为半干旱区生态脆弱地带生态环境建设规划提供了参考依据.
Publisher
中国地质学会永定河下游地区自然资源监测技术创新基地,河北廊坊 065000,中国科学院大学资源与环境学院,北京 100049%中国科学院地理科学与资源研究所/陆地水循环及地表过程重点实验室,北京 100101,中国科学院大学资源与环境学院,北京 100049,宁夏回族自治区基础地质调查院(宁夏回族自治区地质矿产中心实验室),银川 750021%中国科学院地理科学与资源研究所/陆地水循环及地表过程重点实验室,北京 100101
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