太湖流域典型蔬菜地土壤氮磷钾养分空间变异性及分布规律

Spatial Variability and Distribution Pattern of Soil nitrogen, phosphorus and potassium in Vegetable field in Typical Area of Taihu Lake Watershed

采用传统统计和地统计学相结合的方法,以太湖典型地区宜兴市大浦镇湖滨公路以东50 hm2蔬菜地为研究对象,网格法(50 m×50 m)采集表层(0～20 cm)土壤156个,研究了土壤主要肥力参数(N、P、K)空间变异特征和分布规律.结果表明:全P、全N、NH4+-N、速效P和速效K有明显的空间变异结构,且在一定范围内存在空间相关性,其含量具有一定的渐变分布规律.研究区域土壤速效P普遍盈余,土壤N、K丰缺并存.Kriging插值法绘制了土壤养分空间分布图,研究结果为最终实施氮磷养分的分区管理和养分重点控制区的确定提供依据.

In the present investigation, 156 top layer soil samples （0-20 cm） were taken in a regular grid of 50 m by 50 m at 50 hm2 area of vegetable plot located at the east part of Taihui road in Dapu town, Yixing city. Characteristics of spatial variability of soil nutrients were studied using traditional statistics and geostatistics, The results showed： there were obviously semi-variance structure for spatial variability and distribution Pattern of soil total N, available P, available K. Their spatial variability exhibited a gradual change tendency, and spatial variation developed in larger scales. Their spatial variability exhibited a gradual change tendency, and spatial variation developed in larger scales. Soils were widely abundance in P and total N and available K deficient/enrichment were dependence on fields, Field nutrient distribution maps were generated using Kriging method and GIS technique, The results is useful in making regional soil nutrients management and building key control region .