岷江上游高原植被类型与景观特征对土壤性质的影响

土壤空间异质性是土壤的重要属性之一采用地统计学的理论和方法与传统统计学原理，研究了青藏高原东缘高原面土壤性质的空间异质性及其理化因子和植被类型、景观位置的相关性。变异函数分析结果表明，土壤水分与养分元素具有明显的空间异质性由于植被类型与景观性质的影响，利用传统统计学方法，对研究的样地进行了分类统计，结果表明，植被类型与土壤养分之间的相关性很大，海拔高度也是影响养分与水分分布的一个重要因子，灌丛群落类型土壤质量指数高；不同坡位对养分的影响具有相同的趋势，对于不同海拔的地貌来说，丘陵组下坡位>上坡位>中坡位，而低山组为下坡位>中坡位>上坡位；坡面尺度上土壤养分的空间变异受景观性质与生态系统类型的综合影响。

Effects of vegetation types and landscape features on soil properties at the plateau in the upper reaches of Minjiang River

Spatial heterogeneity is one of the important properties of oil. In this paper, the classical statistics method and the principles of geostatistics were used to study the spatial heterogeneity of soil properties on the Tibet plateau in the upper reaches of Minjiang River, and the relationship between vegetation type, landscape position and soil factors. Semivariogram analyses showed that there existed high degrees of spatial heterogeneity in soil moisture and soil nutrients. The test quadrats were assorted into three groups according to the landscape position and vegetation types, and then statistical analyses were made. The taxon results showed that different vegetation types had great effects on soil nutrients, and elevation was also an important factor influencing soil properties. A comprehensive index of soil properties showed that shrubs had the highest soil quality. The same trend of soil nutrients was found in the category of landscape positions. The soil nutrient contents decreased in the order of lower slope > upper slope > middle slope for the lower altitude hill, and lower slope > middle slope > upper slope for the high altitude hill. The results elucidated that the spatial heterogeneity of soil property was the result of the interaction between landscape factors and vegetation types.