兰州市南北两山土壤养分空间分布及其影响因子

分析了兰州南北两山土壤有机质、全氮及全磷的空间分布特征并重点探讨了植被类型与坡向、海拔、坡度等环境因子对土壤有机质、全氮、全磷空间分布的影响.研究结果表明:兰州南北两山土壤有机质和全氮空间分布变异非常显著,空间变异系数分别为55.946%,49.597%,而全磷空间分布差异不显著,空间变异系数仅为8.935%.植被类型对土壤有机质、全氮质量分数有重要影响,其中对土壤有机质质量分数的影响达到显著水平.土壤全磷质量分数不受植被类型影响,仅取决于土壤黄土母质.阴坡土壤有机质、全氮、全磷质量分数均高于阳坡的,其中有机质、全氮质量分数差异达到了显著水平;海拔与土壤有机质、全氮、全磷质量分数均呈极显著的正相关性;坡度与土壤有机质、全氮、全磷质量分数呈负相关性,但相关性不显著.

Spatial distribution of soil nutrients in the south-north hills in Lanzhou and the affecting factors

The spatial distribution of soil organic matter, total nitrogen, total phosphorus of the Southnorth Hills in Lanzhou has been studied and the effects of vegetation types and environment factors such as aspect, altitude, gradient on spatial distribution of soil nutrients have been analyzed. The results showed a spatial variability of soil organic matter; total nitrogen was significant and spatial coefficient of variation is respectively 55.946%, 49.597%. However, the spatial variability of total phosphorus was not significant and the spatial coefficient of variation was 8.935%. Vegetation types affected the soil organic matter and total nitrogen contents and the effects on soil organic matter were significant. Environment factors affected soil nutrient contents, as well. Soil on south-facing slopes contained significantly less organic matter, total nitrogen and total phosphorus compared with north-facing slopes. Differences in organic matter and total nitrogen contents were significant. A significant correlation was found between the altitude and the contents of organic matter, total nitrogen and total phosphorus; that is to say, as altitude is higher, the contents of soil nutrients distinctly increased. The correlation with gradient and soil nutrients was of a negative, but not significant, correlation.