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[1]WANG Jiazhen,ZHANG Qiufen,PENG Hua,et al.Impact of Individual Rainfall on the Changes of Soil Water Content in Deep Layer of Different Land Uses[J].Research of Soil and Water Conservation,2023,30(03):69-75.[doi:10.13869/j.cnki.rswc.2023.03.039]

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Impact of Individual Rainfall on the Changes of Soil Water Content in Deep Layer of Different Land Uses

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 69-75 Column: Public date: 2023-04-10

Title:: Impact of Individual Rainfall on the Changes of Soil Water Content in Deep Layer of Different Land Uses

Author(s):: WANG Jiazhen^1,2, ZHANG Qiufen², PENG Hua³, LYU Xizhi²; (1.Zhengzhou University, Zhengzhou 450001, China; 2.Yellow River Conservancy Research Institute, Yellow River Conservancy Commission, Henan Key Laboratory of Ecological Environmental Protection and Restoration of the Yellow River Basin, Zhengzhou 450003, China; 3.Sichuan Qingshen County River and Lake Service Center, Meishan, Sichuan 620400, China)

Keywords:: Loess Plateau; vegetation type; rainfall grade; soil water content

CLC:: S152.7

DOI:: 10.13869/j.cnki.rswc.2023.03.039

Abstract:: [Objective]Water resources are shortage in the Loess Plateau. Exploring the impact of the individual rainfall on the change of soil water content in different land uses is of great significance to the theoretical exploration of the optimal allocation of regional water resources. [Methods] Based on the measured data of natural rainfall in runoff field of Nanxiaohegou in Qingyang, Gansu Province, and the observed data before and after rainfall under four land use patterns(agriculture, forest, grass and bare), the characteristics of soil water content changes in five different rainfall levels under different land use patterns were analyzed. [Results](1)The dynamic change of soil water content is closely related to land use pattern. Among the four land use patterns, forest land has better water storage capacity than bare land, but the soil water content in bare land fluctuates the most under different rainfall levels. With the increase of soil depth, the response of surface soil moisture to rainfall is obvious, and there is a certain lag between the middle layer and the deep layer.(2)Under specific rainfall conditions, the water exchange at different depths of soil has obvious demarcation point of water active layer. Under heavy rain and rainstorm conditions, there is an obvious demarcation point of water active layer at 40 cm depth. Under moderate rain conditions, except for the significant difference in soil water content after rain, under other land uses, soil water content appeares obvious demarcation point of water active layer from 60 cm.(3)Under different land use patterns, rainfall characteristic factors had the lowest correlation with surface soil water content, but had the highest correlation with middle and deep soil water content. Compared with bare land, forestland, grassland and agricultural land have the greater regulation effects on soil water. [Conclusion] The difference of soil infiltration response to rainfall under different land use patterns is closely related to the distribution of surface vegetation cover and underground vegetation root system. The gray correlation analysis of soil moisture changes provides the theoretical basis for the study of soil and water conservation in the Loess Plateau.

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Last Update: 2023-04-10