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- W2350865551 abstract "The Semivariogram theory was used to study spatial variability of soil salinity at 0～40cm and 40～80cm depths in a typical Yellow River Delta zone.The cross-semivariogram was then analyzed to explore co-regionalized relationships between soil salinity at both depths,and the apparent soil electrical conductivity measured through electromagnetic induction EM38.CoKriging method was further employed to improve the accuracy of soil salinity estimates by treating soil bulk electrical conductivity as auxiliary variable and soil salinity,at both layers,as primary variable.Results indicate that soil salinity at both layers exhibits moderate variation and spatial autocorrelation resulting from compound impact of structural and stochastic factors,and that stochastic factors are crucial in spatial heterogeneity of soil salinity.Co-regionalized variables show positive correlation among each other,and the spatial structure of co-regionalized variables is superior to individual component variables.Compared with ordinary Kriging method,the Root Mean Square Error(RMSE) from CoKriging decreases by 13.1%～17.8%,Average Standard Error(ASE) decreases by 5.83%～17.6%,and the coefficient of determination(RR) between observed and the predicted values increases by 37.6%～42.6%.The research results can serve as both theoretical and practical reference for precise quantification,scientific management and rational amelioration of saline soils in the Yellow River Delta." @default.
- W2350865551 created "2016-06-24" @default.
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- W2350865551 date "2008-01-01" @default.
- W2350865551 modified "2023-10-03" @default.
- W2350865551 title "Determination of spatial distribution of soil salinity by CoKriging and electromagnetic induction method" @default.
- W2350865551 hasPublicationYear "2008" @default.
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