地形因子与土壤养分空间分布的相关性研究

Studying the Relations Between Topographical Factors and the Spatial Distributions of Soil Nutrients

运用地统计学和GIS技术,研究丘陵地区土壤养分的空间变异性,探讨地形因子对土壤养分含量空间分布的影响。结果表明,N、K的空间变异主要来自随机因素,而Mg及其他养分的空间变异性在一定程度上受地形等结构性因素的影响。OM、N、P、K几种大量元素与海拔呈显著正相关,Ca、Mg、S与海拔呈负相关;N与坡度呈显著正相关,Ca与坡度呈显著负相关;OM、N、P与坡向呈负相关,Ca、Mg与坡向呈显著正相关关系;而K、S与地形因子的相关性不显著。研究地形地貌与土壤养分之间的空间关系,为进一步合理地进行土地利用规划提供了理论依据,并且对土壤养分综合管理以及进行土壤改良和耕作都具有一定的指导作用。

Using Geostatistic and the technology of GIS to study the spatial variability of soil nutrients in the hill area. and to discuss how topographical factors can impact the spatial distribution of soil nutrients. The results showed that the spatial variability of N,K came from random factors, but to some extent Mg and the other nutrients＇ spatial variability was effected by structural factors. The correlativity between OM,N,P,K and altitude were remarkably positive, and Ca,Mg,S were negatively correlated to altitude; the correlation of N and slop was notability positive, but Ca was negative; OM,N,P were negatively related to aspect too, and Ca, Mg were positive; However, the correlation between K,S and topographical factors was not remarkable. To study the spatial relations between topography and soil nutrients would provide academic bases for land use and programming reasonably, and also have works on the guidance of the soil nutrients management and soil improvement and cultivation.