湄潭县茶园土壤重金属铬元素含量的空间分布特征

Spatial Distribution Characteristic of Cr in Tea Plantation Soil of Meitan County

为湄潭茶叶产地环境及安全生产管理、规划和预测预警提供指导依据,采用数理统计与地统计学空间分析方法,研究了湄潭县茶园土壤中的重金属铬的空间分布特征,并在地理信息系统支持下绘制了空间分布图。结果表明:湄潭县茶园土壤中铬含量分布具有较好的空间性,空间变异主要受母质、土壤性质等内在因素的影响,人为生产活动尚未对该地区土壤带来额外的铬污染;茶园土壤铬含量服从正态分布,总体平均值低于国家标准,土壤铬污染现象不严重,但F、G、L区有超标现象。通过Kriging分析,铬的高值区大致在西部F区与K区交界处,而东部G区和L区向四周呈辐射状逐渐降低,铬高值区受区域因素的影响较大。

The spatial distribution characteristics and map of Cr in tea plantation soil of Meitan county was studied and drawn by using the methods of mathematical statistics and spatial analysis based on geographical information system to provide the guiding basis for management,planning and forecast of environment and safe production of tea producing area in Meitan county.The results showed that Cr distribution in tea plantation soil was of good spatiality,Cr spatial variance was mainly affected by internal factors such as parent material,soil characteristics,et al.,human activities had not produced additional Cr pollution.The content of Cr in tea plantation soil of Meitan county accords with normal distribution and its overall mean value was below national standard.The Cr pollution was not severe but its content in F,G and L zones was higher than national standard.The area with high Cr content was at the junction of western F and K zones,and the Cr content in eastern G and L zones decreased from the central to the margin,which indicated the areas with high Cr content were mainly affected by regional factor.