Zhao Yiru,Gao Yuqi,Wang Zhongqi,et al.Response of soil water content to rainfall events under different land use types on the loess tableland[J].Research of Soil and Water Conservation,2025,32(02):34-42.[doi:10.13869/j.cnki.rswc.2025.02.006]
黄土塬区不同土地利用方式土壤水分对次降雨的响应特征
- Title:
- Response of soil water content to rainfall events under different land use types on the loess tableland
- 文章编号:
- 1005-3409(2025)02-0034-09
- 分类号:
- S152.7
- 文献标志码:
- A
- 摘要:
- [目的]探究土壤水分对次降雨响应过程,揭示该地区不同土地利用方式的土壤水分特征,进而为缺水地区降水利用和农业水资源合理配置提供观测依据。[方法]对2021年黄土塬区苜蓿草地、休闲地、高产农田(正常施肥)和低产农田(长期不施肥)4种土地利用方式的土壤水分进行了定位监测,并分析其对大于30 mm的3次降雨事件响应过程。[结果]随着降雨量的增加,苜蓿草地、休闲地、高产农田和低产农田的降雨入渗和水分再分布深度也呈增大趋势,最大水分入渗深度分别为300,500,500,500 cm。不同土地利用方式土壤含水量具有明显的季节特征,月均土壤含水量呈现先增大后减小的趋势,最小值分别出现在8月、1月、1月和6月,最大值均在10月。雨季后,土壤水分仍处于再分布过程,12月底苜蓿草地、休闲地、高产农田和低产农田水分再分布深度分别达到400,700,800,700 cm; 土壤储水量变化滞后于降雨量,9—10月土壤储水量变化最强烈,苜蓿地、休闲地、高产农田和低产农田土壤储水量增幅分别为390.6,197.5,299.8,157.4 mm。[结论]4种土地利用方式中,亏缺严重的苜蓿草地土壤水分对降雨的响应最为敏感,最大响应深度可达400 cm,土壤储水量变化幅度也最大,水分再分布过程导致其变化滞后于降水量。
- Abstract:
- [Objective]The aims of this study are to explore the response of soil water to rainfall, to reveal the soil water characteristics of different land use types in this area, and to provide observation basis for rainfall utilization and rational allocation of agricultural water resources in water shortage areas. [Methods]The soil water contents(SWC)of alfalfa field, fallow field, fertilized cropland(normal fertilization)and unfertilized cropland(no fertilization)of the loess tableland in 2021 were monitored. The effects of three rainfall events(greater than 30 mm)on soil water content were analyzed. [Results]With the increase of rainfall, the infiltration and water redistribution depths of alfalfa field, fallow field, fertilized cropland and unfertilized cropland also showed an increasing trend, and the maximum water infiltration depths were 340, 500, 500 and 500 cm, respectively. The SWC of different land use types had obvious seasonal characteristics, the monthly average SWC generally showed an increasing trend first and then decreased, the minimum values appeared in August, January, January and June, respectively, and the maximum values appeared in October. Soil water was still in the process of redistribution after the rainy season, the water redistribution depths of alfalfa field, fallow field, fertilized cropland and unfertilized cropland reached 400, 700, 800 and 700 cm, respectively, at the end of December. The change of soil water storage lagged behind rainfall, which was the strongest from September to October, the increase amounts of soil water storage in alfalfa field, fallow field, fertilized cropland and unfertilized cropland were 390.6, 197.5, 299.8 and 157.4 mm, respectively. [Conclusion]Among the four land use types, the soil water of alfalfa field with severe deficit was the most sensitive to rainfall. The maximum response depth could reach 400 cm, and the change range of soil water storage was also the largest. The process of water redistribution led to its change lagging behind precipitation.
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备注/Memo
收稿日期:2024-06-13 修回日期:2024-07-16 接受日期:2024-07-18
资助项目:国家自然科学基金(42007011,41971049); 中国科学院西部青年学者项目(XAB2018B08)
第一作者:赵意茹(1999—),女,河南洛阳人,硕士研究生,研究方向为土壤水分运移。E-mail:zyr99111@163.com
通信作者:韩晓阳(1987—),男,山东聊城人,博士,副研究员,主要从事植被格局与土壤水碳关系研究。E-mail:xyhan11@nwafu.edu.cn