基于GIS和地统计学的低丘红壤地区三种土壤性质空间变异性研究

以浙江省金华市为例,采用地统计学和GIS相结合的方法,对低丘红壤地区土壤有机质、有效N、有效K3种主要性质的空间变异特性进行研究。研究表明,通过平方根转换后,三者都呈很好的正态分布。有机质的变异函数曲线的理论模型较好地符合球状模型,有效N和有效K则符合指数模型。三者都属于中等空间相关性,同时受到结构性因素和随机性因素的共同影响。通过分析3种土壤性质的各向异性,发现不同的土壤性质有不同的空间分布,同一土壤性质在不同的方向上也有不同的空间变异性。

On spatial variance of three soil characteristics in red soil hilly region based on GIS and geostatistics

The spatial variability of organic matter, available N and available K in red soil hilly region of Jinhua County, Zhejiang Province were studied by GIS and geostatistics. The results showed that:The contents of the three soil characteristics all showed good normal distributions after being transformed by square. The theoretical spherical model was accord with soil organic matter, while the exponential model was accord with soil available N and available K. The three soil characteristics all showed moderate spatial dependence, and their contents were influenced by both the intrinsic and extrinsic factors. The three soil characteristics showed different spatial distribution patterns and each nutrient also showed different spatial variability at different direction.