沈阳地区农田土壤重金属空间分布特征及现状评价

The spatial distribution features and the status evaluation of heavy metal in farmland soils in Shenyang area

该文采集沈阳地区56.7万hm2农田的2 256个点位的土壤样本,并对土壤中重金属铅、镉、汞、砷、铜、总铬含量进行测定,运用地统计学方法和ArcGIS软件分析了沈阳地区农田土壤重金属污染的水平空间分布及其变异,结果表明:沈阳地区农田表层土壤镉、汞元素含量的变异性大,镉、铜、砷元素分布呈现岛状分布;汞、铅及铬具有块状和连续分布特点;铬、铜元素有南高北低的特点,且94.40%的农田土壤处于清洁或尚清洁水平,4.31%的农田土壤处于污染水平,主要分布在于洪区、辽中县、东陵区及苏家屯区的局部地区。

In this paper,2 256 soil samples were collected in 0.567 million hm2 farmland of Shenyang area.The content of plumbum,chromium,mercury,arsenic,copper and chrome were determined in soil.The horizontal spatial distribution features and variation of heavy metal pollution were analyzed by using statistics method and ArcGIS software.The result showed that variability of chromium and mercury content were great.The distribution of chromium,copper and arsenic presented island-form,and the character of mercury,plumbum and chromium were lump-form and continuous distribution.The clearing soil was 94.40% in farmland of Shenyang area,and pollutional soil which mainly distributed in Yuhong District,Liaozhong County,Dongling District and part area of Sujiatun Distric was 4.31%.