Distribution and Residue of Soil Total P and Available P under Different Land Use Types in Northwest Guizhou

XUE Xiaohui; XIONG Jinsong; WANG Yanlin

doi:10.15933/j.cnki.1004-3268.2017.07.008

Abstract：The research selected five land use types in the Guanmenshan small watershed in northwest Guizhou,and studied the distribution and residue characteristics of total P and available P in different land use types of soil,so as to provide a theoretical basis for local ecological environment protection and scientific application of phosphorus fertilizer.The results showed that the content of total P in the surface soil in shrub land was higher than that in arbor land,but the distribution of available P content was not regular.In the three positions of slop top,slop middle and slop bottom,the contents of total P and available P decreased with the increase of soil depth in the soil profiles of arbor and shrub lands,and were highest in 0-20 cm soil layer,total P contents in slope middle and slope bottom were higher than that in slope top in 0-60 cm soil layer;total P accumulated in 80-100 cm and 60-80 cm soil layer in the slop middle and slop top of arbor land respectively,but accumulation phenomenon did not appear in the slope bottom.For five land use types,the contents of total P and available P were highest in 0-20 cm soil layer,and decreased with the increase of soil depth,and the total P content was higher in the soil profile in orchard than that in other land use types;available P content was the highest in the soil profile in corn field,and lowest in arbor land.Residual rate of total P was the lowest in 0-80 cm soil layer in arbor land with 1 783.7 kg/ha,and highest in orchard with 3 416.0 kg/ha,which was significantly higher than that in other land use types;residual rate of available P was the lowest in shrub land,and highest in abandoned land,but the difference was not significant among different land use types.