关键词: 土壤养分, 地形因子, 土地利用, 空间变异性

Abstract: Soil nutrient is the material guarantee of plant growth. Topography and human activities will affect the spatial distribution of soil characters. Taking Maoshan watershed in the black soil region of Northeast China as an example, this paper analyzed the spatial characteristics of soil nutrients by using GIS technology and geostatistics method, and also explored the effects of topographic factors, land use types and their interaction. The results showed that: ①The distribution of soil nutrients in Maoshan watershed accorded with the normal distribution. The variation coefficients of soil organic matter, alkaline hydrolysis nitrogen, available phosphorus and available potassium were 1734% ～ 4081%. ②The spatial distribution of soil nutrients increased from northwest to southeast, and the content of soil nutrients in the middle of the basin was higher than that in the east and west. ③Elevation and slope factors were negatively correlated with soil organic matter, alkaline hydrolysis nitrogen, available phosphorus and available potassium. Soil nutrients had no significant correlations with slope aspect. ④Elevation factors and land use types interactively affected soil nutrient properties. Slope, aspect factors and land use types interactively had no significant effects on these soil nutrient properties.

Key words: soil nutrient, topographic factors, land use, spatial variability