松辽平原土壤环境背景值区域特征及分布规律

一、前言 “松辽平原土壤环境背景值调查研究”列入国家“六五”重点攻关课题,由辽宁、吉林、黑龙江三省环境监测中心站、中国科学院林业土壤研究所、长春地理所、高能物理所等十六个单位组成协作组,对松辽平原24.6万km~2土地,采土壤剖面1025个,土壤样品3284个,进行35项元素及土壤性质的分析测试,共获得数据七万余个,提出了松辽平原土壤背景值及背景图。本文从土壤地球化学观点出发对该区土壤背景值区域特征及分布规律作一些探讨,至于详细采样布点设计,所用分析方法与质量控制以及分布类型检验方法等,请参阅“松辽平原土壤背景值调查研究”报告,此处从略。

Regional Features of Soil Background Values and Their Distributive Rules in the Songhuajiang-Liaohe Rivers Plain

This paper surveys background values of seme trace elements in soils of Songhuajiang-Liaohe rivers plain, and finds out their regional features and distributive rules. Background values of some trace element contents in various soil groups of the said region reads in order as follows: paddy soll>bog soil>side bleached soils>brown soil>dark brown forest soils>meadow soils>black soils>cinnamon soils>chernozem>halogenic soils>dark cas-tanozems>aeolian sandy soils, as is coincident approximately with natural geographical rules from east to west.The soil background values in the region is low, as compared with normal ones in the world as well as in other regions of China. The variance coefficients of these values are mostly below 0.5; migration coefficients of the elements in soil profiles are 0.9-1.1. In this paper causes of mentioned rules have been discussed.