贵州省万山区耕地土壤硒元素分布特征与相关性分析

硒是环境中重要的生命元素，缺硒和硒过剩都将引起生物及人体的不良反应。本文以贵州省万山区耕地土壤为研究对象，通过系统采样及化验分析耕地土壤硒含量，结果发现万山区耕地土壤硒含量在005801 mg/kg，平均值为050 mg/kg，总体上达到富硒区标准，富硒土壤面积2278万亩，占万山区耕地总面积的7743%，硒元素高值区分布在万山区东部的熬寨乡。同时，对影响万山区耕地土壤硒元素含量的相关性进行研究，得知影响土壤硒含量的主要因素是成土母岩、土壤类型，土地利用方式，土壤硒含量只与Hg、Cd、Mo、SOM呈弱相关性，与其余元素均无相关性。本研究成果对万山区土地合理规划利用，富硒产业的科学发展具有重要价值。

Distribution characteristics and correlation analysis of selenium element of cultivated land soil in Wanshan District,Guizhou Province

Selenium is an important element of life in the environment. Both the lack of selenium and the excess of selenium will cause adverse reactions in biology and human body. In this paper, it takes the cultivated land soil in Wanshan district of Guizhou province as the research object. Through systematic sampling and laboratory analysis of the selenium content in cultivated land, it was found that the selenium content in cultivated land in Wanshan ranged from 0.05 to 8.01 mg/kg, with an average of 0.50 mg/kg. In general, it meets the standard of selenium-rich area. The selenium-rich soil area is 227 800 mu, accounting for 77.43% of the total cultivated land area in Wanshan district. The high value area of selenium is distributed in Aozhai township in the east of Wanshan district. At the same time, the correlation of soil selenium content in cultivated land in Wanshan was studied, and it was found that the main factors affecting soil selenium content were soil forming rock, soil type and land utilization type.Soil selenium content was only weakly correlated with Hg, Cd, Mo and SOM, but not with other elements.The research results have important value for the rational planning and utilization in Wanshan district and the scientific development of selenium-enriched industry.