Abstract:

In order to study on the law of spatial variability of the farmland trace elements in Dongting Lake area, the spatial variability of five kinds of trace elements of the cultivated soil arable layer in Dongting Lake area (Yuanjiang City) was studied by using on geo-statistics and GIS technology. The results were as follows: the contents of the five trace elements (B, Cu, Zn, Fe, and Mn) accorded with normal distribution, but the difference in the ranges of the five elements was large between 1.13 km and 25.58 km. The content distribution of the two elements (Mn, Fe) accorded with an index model and the content distribution of the other three elements (Zn, Cu and B) accorded with a spherical model. The spatial correlation of the element (Mn) was subjected to a smaller man-made factor. On the contrary, the other three elements (B, Cu, and Zn) were suffered from a greater human impact. The general trend of the contents of Cu and Fe were gradually decreased from the northeast to the southwest and they were the highest in the middle part of the study area. The general trends of the content of Zn and the content of B were respectively gradually decreased from the west to the east and the southwest to the northeast in the study area. It was suitable for Yuanjiang City to develop superior agricultural products industry for the reasons that the trace elements were enrichment, the quality of the soil was good and there was no major contaminated area.