DU Haotian,JIAO Feng,YAO Jing,et al.Effects of Precipitation Changes on Soil Moisture Characteristics of Returning Farmland in Loess Hilly Region[J].Research of Soil and Water Conservation,2019,26(05):81-88.
黄土丘陵区降水变化对退耕草地土壤水分特征的影响
- Title:
- Effects of Precipitation Changes on Soil Moisture Characteristics of Returning Farmland in Loess Hilly Region
- Keywords:
- loess hills; returning farmland; soil moisture; precipitation change
- 分类号:
- S152.7
- 摘要:
- 在全球气候变化背景下，我国黄土高原的降水格局将呈现出季节波动增强和极端降水事件增加的趋势。土壤水分是黄土丘陵区的主要限制因子，降水变化所引起的土壤水分的改变必然对该区生态系统的结构和功能产生显著的影响。选取黄土丘陵区退耕草地为研究对象，连续定位观测自然恢复小区不同降雨梯度下（0，±20%，±40%，±60%，±80%）土壤水分动态变化，研究土壤水分变化特征及其对降水变化的响应。结果表明：（1）随年内季节性降水变化，退耕草地生长季内土壤含水量呈“W”形波动变化；（2）随降水梯度的增加，各土层土壤含水量变化趋势一致，均呈“M”型变化；（3）-20%下5—9月份土壤含水量均能保持较高水平，适当的干旱处理有助于维持较高的土壤含水量。但减雨超过40%或增雨超过60%都不利于土壤水分的积累；（4）0—30 cm土层土壤含水量对降水的响应最为明显，随着土层深度的增加响应逐渐减弱；维持和利用浅层地表水是植被恢复的关键。
- Abstract:
- In order to study the characteristics of soil water change and its response to precipitation changes, this paper takes the returned grassland in the Yanhe River Watershed of the Loess Plateau as the research object, and continuously conducts the positioning observation of soil moisture under different rainfall gradients (0,±20%, ±40%, ±60%, ±80%) in the natural restoration area. The results showed that:(1) with the change of seasonal precipitation during the year, the soil water content in the growing season showed the ‘W’ shape fluctuation; (2) with the increase of rainfall gradient, the soil moisture content of each soil layer showed the same trend, showing ‘M’ Type change; (3) soil moisture content can be maintained at a high level from May to September under -20% of rainfall, indicating that proper drought treatment can help maintain high soil water content. However, rainfall reduced by more than 40% or rainfall increased by more than 60% is not conducive to the accumulation of soil moisture; (4) the soil water content of 0-30 cm soil layer has the most obvious response to precipitation, and the response gradually decreases with the increase of soil depth. Maintaining and utilizing shallow surface water is the key to vegetation restoration.
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备注/Memo
收稿日期:2018-11-04;改回日期:2018-11-27。
基金项目:国家重点研发计划项目（2016YFA0600801）；科技基础性工作专项（2014FY210130）
作者简介:杜好田(1992-),男,河南新乡人,在读硕士,主要从事水土保持与环境效应监测评价。E-mail:duhaootian@163.com
通讯作者:焦峰(1967-),男,陕西省三原人,博士,副研究员,主要从事GIS应用、水土保持与环境效应监测评价。E-mail:Jiaof@ms.iswc.ac.cn