Abstract

Info

Title:: Spatial Variation Characteristics and Evaluation of Soil Available Zinc in a Typical Small Watershed of the Middle Hanjiang River

Author(s):: LI Heng-ming; YANG Miao-miao; The Station of Xi’an Information Technology of Mapping, Xi’an 710043, Shaanxi, China

Keywords:: available zinc; spatial variation; geostatistics; Kriging interpolation; land use type; aspect; Hanjiang River

Abstract:: In order to evaluate the distribution characteristics of soil available zinc in a typical small watershed of the middle Hanjiang River, the 207 soil samples were collected with the depths of 0-10, 10-20, 20-40 cm in Yujiehe small watershed by the means of grid method. Based on geostatistics and Kriging interpolation, combined with the effect of aspect, the spatial variation characteristics of soil available zinc were discussed, and the abundance of soil available zinc was evaluated. The results show that the content of soil available zinc decreases with the increase of soil depth; according to the variance test, the differences of spatial variations of content of soil available zinc at 0-10 cm soil depth are significant; the correlation of content of soil available zinc and aspect for forestland is significant and positive in 0-10, 20-0 cm soil depths; the correlation of content of soil available zinc and aspect for grassland is significant and negative in 0-10 cm soil depth, and extremely significant and negative in 10-20 and 20-40 cm soil depths; the storage of soil available zinc is 45-42 kg in 0-10 cm soil depth, and there are forestland, cropland and grassland in descending order; According to the comprehensive evaluation index of average density of soil available trace elements, the soil available zinc is rich in Yujiehe small watershed of the middle Hanjiang River.