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[1]ZHANG Xue,DONG Jianguo,WANG Youke,et al.Soil Moisture of Rainwater Harvesting Ditches Under Different Rainfall Conditions in the Hilly Loess Region[J].Research of Soil and Water Conservation,2015,22(02):129-135.

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Soil Moisture of Rainwater Harvesting Ditches Under Different Rainfall Conditions in the Hilly Loess Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 02 Page number: 129-135 Column: Public date: 2015-04-28

Title:: Soil Moisture of Rainwater Harvesting Ditches Under Different Rainfall Conditions in the Hilly Loess Region

Author(s):: ZHANG Xue¹, DONG Jianguo¹, WANG Youke^1,2, GUO Xuxin³, ZHAO Ying³, WEI Xindong^1,4; 1. College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
3. Vocational Technical College of Yangling, Yangling, Shaanxi 712100, China;
4. College of Resources, Chang’an University, Xi’an 710054, China

Keywords:: soil moisture; rainfall infiltration; rain water harvesting ditch; hilly loess region

CLC:: S157.9

DOI:: -

Abstract:: To improve the effective utilization rate of rainfall in the loess hilly region of north Shaanxi Province, this paper examined the conservation effect of rainwater harvesting ditchs (RHD) filled with gravel, straw, branch or matrix compared with level terrace. The results showed that soil moisture presents no increase in the RHDs under the rainfall lesss than 6 mm. When the rainfall ranged from 6 to 10 mm, soil moisture content exhibited significant differences in 10 cm soil layer of RHD(p < 0.05). Under the condition of 25~40 mm rainfall, the average water content is 16.14% higher than the control in the vertical 0~40 cm soil layer on both sides of RHDs, the amounts of increment soil moisture by RHDs were in the order of straw(4.8%) > branch(3.5%) > stone(3.1%) > reference(2.4%) > matrix(2.3%). According to the data of disposable dammed-up, the water storage increased by 12.6%～17.5% in the 30—190 cm soil layer after daily above 40 mm rainfall compared to the control, more than 13% of water moisture can be maintained for nearly a month in 30 cm×30 cm×70 cm distance on both sides of RHD when there is no rain in the later period. The water influence depths of gravel, straw, branch, matrix ditches are 120, 160, 160, 130 cm, respectively, under the condition of 36.8 mm of typical month accumulative rainfall. In summary, RHDs filled with straw or branch not only improve water infiltration, at the same time, but also promote surrounding water distribution and storage， which shows better effects than the filled gravel or matrix.

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