Response of soil moisture variation to individual rainfall on the field slope in the loessial hilly-gully region
HE Zimiao, XIAO Peiqing, HAO Shilong, YANG Chunxia
1. School of Resources and Environment North China University of Water Resources and Electric Power, 450045, Zhengzhou, China;
2. Yellow River Institute of Hydraulic Research, Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of the Ministry of Water Resources, 450003, Zhengzhou, China;
3. Nanyang Normal University, Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, 473061, Nanyang, Henan, China
Abstract：[Background] The vertical variation and spatial variability of soil moisture have important effects on the process of rainfall, infiltration and runoff.[Methods] In order to study the relationship between rainfall and soil moisture response in the Loess Plateau, the vertical variation and spatial variability of soil moisture under 90 mm/h rainfall in Luoyu Valley watershed of Tianshui city was studied using dynamic monitoring and simulated rainfall method.[Results] For natural condition, the vertical change in soil moisture could be divided into four levels:the rapid change layer (0-20 cm),the active layer (20-30 cm),the second active layer (30-40 cm),and the relatively stable layer (deeper 40 cm).There was stratification in the vertical distribution of soil moisture, and the slope distribution of soil moisture had significant differences in slope position (P<0.05). Frequent exchange of soil moisture and air was also concentrated in the 0-40 cm soil layer range. During the rainfall, the activity of soil moisture was obviously enhanced, but the influence was mainly in the range of 0-30 cm soil layer, the influence of soil moisture by rainfall was negatively correlated with the soil depth. The change of soil moisture of 0-30 cm soil layer with time was not uniform, there were 3 periods of the rapid rise period, the stable period and the slight decline period. In deeper soil layer, there was a gradient difference in the vertical variation of soil moisture. Except for the surface soil, the rainfall infiltration only increases the soil moisture of each soil layer, while the proportion of soil moisture did not change,the distribution of soil moisture in the slope was more significant(P<0.01). With the increase of soil moisture of 0-30 cm soil layer, the runoff rate showed the trend of increase to a stable value. The sediment yield rate increased to a peak value, and then decreased, became stable gradually.[Conclusions] The research of the relationship between rainfall and soil moisture played an important role in explaining the redistribution of soil moisture and the migration of organic matter, and provided scientific basis and theoretical guidance for efficient utilization of water resources and vegetation restoration and ecological reconstruction in hilly-gully region of Loess Plateau.
何子淼1,2, 肖培青2, 郝仕龙1,3, 杨春霞2. 黄丘区野外坡面土壤水分变化对次降雨过程的响应[J]. 中国水土保持科学, 2018, 16(4): 16-24.
HE Zimiao, XIAO Peiqing, HAO Shilong, YANG Chunxia. Response of soil moisture variation to individual rainfall on the field slope in the loessial hilly-gully region. SSWC, 2018, 16(4): 16-24.
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2018, Vol. 16 
