Spatial variability analysis of soil infiltration by calculating simplified G-A infiltration parameters using soil compaction
Liu Shanshan1,2, Xu Di1,2, Bai Meijian1,2, Li Yinong1,2, Wen Xinmin3
1.National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China; 2.Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 3. 222 Regiment Field of Xinjiang Production and Construction Corps, Fukang, Xinjiang 831500, China
In order to analyze the spatial variability of soil infiltration and provide guidance for irrigation system design and management, based on the observed data of initial water content, soil compaction, clay content and soil infiltration at typical points, the rationality of calculating simplified G-A infiltration parameters using soil compaction were analyzed by means of multiple linear regression me-thod. Furthermore, spatial variability of soil infiltration was also discussed using semi-variance analysis at different basin sizes. The results show that there is a high correlation among soil compaction, soil texture, soil structure and soil water content, meanwhile satisfactory significance was reached in its regression relevance with soil infiltration parameters. Thus it is feasible to calculate simplified G-A infiltration parameters using soil compaction. When the basin size expanded from 0.5 hm2 to 3.0 hm2, the variation coefficient of G-A infiltration parameters were between 0.1 and 1.0. Medium spatial variability of G-A infiltration parameters were found at different basin sizes. The semi-variogram of G-A infiltration parameters could be described by spherical model, and the spatial structural correlation were medium. No significant differences in spatial variation of infiltration parameters were found among different basin sizes.
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