植烟土壤pH和中量元素空间变异研究

Spatial Variability of Tobacco Soil pH and Middle-Elements

为推进植烟土壤的精细管理与精准施肥,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pH和有效态中量元素的空间变异及分布特征进行了分析。研究表明,土壤pH和有效态钙、镁、硫含量的空间变异函数分别为指数、球形、高斯、高斯模型,它们都具有中等的空间相关性,其变异均受地形、土壤类型等结构因素和施肥、管理水平等随机因素共同影响。克里格(Kriging)插值图较为直观的描述了昌图烟区植烟土壤的pH和有效态中量元素的空间分布格局,为昌图烟田的分区管理提供了依据。

In order to promote the accurate management and proper fertilization of tobacco soil, spatial analysis on tobacco soil pH and middle-element was made by GIS and geostatistics in the tobacco region of Changtu,Liaoning province. The results showed that, the semivariograms for soil pH, available Ca, Mg and S contents were well fitted by exponential, spherical, gaussian and gaussian models, respectively. The four variables all had the moderate spatial correlation, indicating them co-affected by structural factors like terrain and soil type and random factors such as fertilization and field managements. The spatial distribution pattern of tobacco soil pH and available middle-elements in the tobacco region of Changtu was intuitively characterized by Kriging interpolation, which provided scientific basis for tobacco field management by regions.