Spatial Variability of Soil Available Microelements of Cultivated Land in Xi’an

doi:10.11924/j.issn.1000-6850.casb19020054

Abstract

Abstract: To clarify the spatial distribution of soil available microelements of cultivated land in Xi’an and provide a basis for better fertilizer management, the spatial distribution characteristics of soil available iron (Fe), manganese (Mn), copper (Cu) and zinc (Zn) were studied by using the geostatistic method combined with GIS. The results showed that the average content of soil available Fe, Mn, Cu and Zn was 9.84, 12.95, 1.82 and 2.61 mg/kg, respectively. All these values were significantly higher than that in the second national soil survey. The contents of available Fe, Mn and Cu were moderately variable in space, however, Zn had strong variation. The optimal semi-variance model for the available Fe, Cu and Zn were spherical model and that for available Mn was Gaussian model. The analysis of the nugget coefficient showed that available Fe, Cu and Zn had strong spatial correlation, while Mn had a moderate spatial correlation. As to the spatial distribution, the contents of soil available Fe in the north and south of Xi’an were higher than that in other areas, the contents of available Cu in the west were higher than that in the east, and the spatial distribution of available Mn and Zn were complicated. In general, the contents of soil available Fe, Mn, Cu and Zn in the study area are rich. The contents of soil available Fe, Mn, Cu and Zn in most cultivated land are above the medium level, but there is still a certain proportion of cultivated land lacking available microelements. Therefore, it is necessary to take the regionalized and balanced fertilization technology in agricultural production.

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