基于GIS和地统计学的植烟土壤养分空间分析

Spatial analysis of tobacco soil nutrients based on GIS and geostatistics

为推进植烟土壤的精细管理与合理施肥,以辽宁昌图烟区为例,采用GIS和地统计学相结合的方法,对其植烟土壤养分的空间变异及分布特征进行了分析。研究结果表明,土壤有机质、碱解氮、速效磷和速效钾含量的空间变异函数均为球状模型。其中,土壤碱解氮具有强烈的空间相关性,说明其受母质、地形、土壤类型等结构因素影响较大;土壤有机质、速效磷和速效钾具有中等的空间相关性,说明其受结构因素和施肥、管理水平等随机因素共同影响。Kriging插值图较为直观地描述了昌图烟区植烟土壤养分的空间分布规律。

In order to promote accurate management and proper fertilization of tobacco soil, spatial analysis on tobacco soil nu- trients was conducted by GIS and geostatistics in the tobacco region of Changtu, Liaoning province. Results showed that, the semivariograms for soil organic matter, available nitrogen, phosphorus and potassium contents were all well fitted by spherical model. Soil available nitrogen had strong spatial correlation, indicating it was primarily controlled by structural factors like parent material, relief and soil type, while soil organic matter, available phosphorus, and potassium had moderate spatial cor- relation, suggesting they were co-affected by structural factors and random factors such as fertilization and field managements. The spatial distribution of tobacco soil nutrients in the tobacco region of Changtu was intuitively characterized by Kriging interpolation.