Effects of canal lining on soil organic matters in Jing Huiqu Irrigation District and their spatial variability
WEI Xue1,2,3,4, ZHOU Beibei1,2,3,4, WANG Quanjiu1,2,3,4
1.Institute of Water Resources and Hydro-electric Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 2.State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area, Xi′an, Shaanxi 710048, China; 3.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 4.State Key Laboratory of Soil Erosion and Dryland Farming on the Losses Plateau, Yangling, Shaanxi 712100, China
In order to fully understand the impact of water-saving irrigation canal lining on soil quality, spatial and temporal variation characteristics of soil organic matter(SOM)and soil particles in both sides of lining canals are investigated in trunk and branch canals Jing Huiqu Irrigation District, Shaanxi Province by using traditional statistics, geostatistics and GIS. The results show that SOM in both sides of lining canals is 18.96-162.92 mg/kg with an average of 86.07 mg/kg, particularly, SOM is the maximum for cast-in-place concrete lining canals, and is the minimum for composite geomembrane lining cannels, is in between for masonry ling cannels. Based on a variogram analysis the semivariance function of SOM can be best fitted by using an exponential function with a 21.7 km range. The spatial covariance has a second-order trend and anisotropy on the spatial variability in the study area; and the spatial heterogeneity, caused by the relevant part of the overall spatial variability, accounted for a smaller proportion, presenting of moderate dependence on space and belonging to moderate variability. Using the ordinary Kriging interpolation method, the spatial distribution of SOM and soil particles are obtained; and the characteristics of the spatial distribution and influencing factors are analyzed.
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