万源市土壤质量初步评价

本文采用综合判别指数法和内梅罗指数法分别对万源市土壤肥力质量和土壤环境质量进行评价。以土壤中Cu、Zn、Mn、Se、N、TFe2O3、K2O、Ni、P、Co十项指标对万源市土壤肥力质量进行评价，且进行质量分区。规划出万源市土壤营养元素优势区、土壤营养元素适宜区（包括良好区和一般区）及土壤营养元素劣势区，土壤营养元素优势区主要分布在庙子乡、大竹河一带，万源市大部分地区处于营养元素适宜区，西部少数地区及南部固军部分地带土壤处于营养元素劣势区。总体上呈现出东高西少的分布趋势。以Pb、Cd、Cr、As、Hg五项指标对上述分区进行了土壤环境质量评价。结果表明：营养元素优势区及良好区大部分地区土壤重金属元素累积达到轻污染级别。而营养元素一般区及劣势区其土壤较为清洁。从单项指标上来看，全区范围内，除Cd以外的其他重金属元素污染指数均小于1，无污染。

Primary Assessment of Soil Quality in Wanyuan

This paper adopted the Synthetical Discriminant Index and the Nemerow Synthetical Pollution Index to assess the quality of the soil fertility and the environmental quality in Wanyuan. Based on the ten elements Cu、 Zn 、 Mn 、 Se、 N 、 TFe2O3 、K2O、Ni、P、Co, we assessed the quality of the soil fertility and divided it into the different fertile districts. The dominant nutrients areas, the suitable nutrients areas（ the nicer and the general）, the absent nutrients areas was projected. The most dominant nutrients areas distributed in the zones of Miaozi and Dazhuhe, the suitable nutrients in the most areas of Wanyuan, the absent nutrients areas in a few zones of west and a few zones of Gujun. On the whole, it demonstrated that the content of nutrients is higher in the east, low in the west. And based on the five elements Pb、Cd 、Cr、As、Hg, we assessed the quality of the environment. The results showed： The most dominant and the nice nutrients areas belonged to the light pollution, and the general and the absent nutrients areas belonged to cleanness. Started with single index evaluation, except Cd the other elements＇pollution indexes is lower to 1, and showed that they didn＇t cause the soil pollution.