河南省睢县西南部土壤硒的地球化学特征及影响因素

Geochemical characteristics and influencing factors of soil Selenium in thesouthwest of Suixian, Henan Province

本文以表层、深层土壤的地球化学调查数据为基础,结合数理统计方法,对河南省睢县西南部农用地的土壤地球化学特征以及硒元素的分布规律和影响因素进行了探讨。结果表明,研究区土壤硒平均含量为0.24μg/g,其中Se>0.30μg/g的土壤面积约1200 hm2,占研究区总面积的11.65%;表层土壤中非金属元素(N、P、S)和金属元素(Mo、Cd、Cu、Hg、Zn)的含量与硒含量相关性较高,对硒含量的影响较大;土壤硒含量受成土母质的影响,与有机质呈显著的正相关关系,但与土壤pH关系不显著;垂向上土壤Se元素含量自上而下基本呈现逐渐减小的趋势。研究成果可为当地政府今后富硒土地规划利用、富硒农业的发展等提供科学依据。

Based on the geochemical survey data of surface and deep soil and the methods of mathematical statistics,the geochemical characteristics of soil and the distribution and influencing factors of selenium in the southwest agricultural land of Suixian,Henan Province were discussed.The results showed that the average soil selenium content in the study area was 0.24μg/g,and the soil area with Se>0.30μg/g was about 1200 hm2,accounting for 11.65%of the total area.The contents of nonmetallic elements(N,P,S)and metallic elements(Mo,Cd,Cu,Hg,Zn)in surface soil had a high correlation with selenium content,and had a great influence on selenium content.The content of selenium in soil was affected by the parent material,and had a significant posi⁃tive correlation with organic matter,but had no significant relationship with soil pH.The content of selenium in vertical soil showed a decreasing trend from top to bottom.The research results can provide scientific basis for the local government's future planning and utilization of Se-rich land and the development of Se-rich agriculture.