铁门关市土壤硒含量分布特征及影响因素探讨

Exploration on the distribution characteristics of soil selenium contenct in Tiemenguan city

为探讨新疆铁门关市土壤硒含量、空间分布特征和影响因素,系统采集分析了3916件表层土壤样品和59件上游山体岩石样品,测定了岩石样品硒和土壤样品硒、pH、水溶性盐总量、阳离子交换量、有机质、全氮磷钾和重金属元素等16个分析指标,采用皮尔逊相关性及主成分分析对土壤类型的指标进行综合研究。结果表明:研究区表层土壤硒含量均值为0.36mg·kg^(-1),富硒土壤面积113.12km^(2),无硒中毒和重金属污染土地。土壤硒元素主要来源于石炭系下统野云沟组灰岩、粉砂岩和砂岩,除了受成土母质、土壤类型的影响外,还受有机质、阳离子交换量、全氮磷钾等肥力指标的影响。对土地利用类型现状的研究发现,铁门关市具有提升富硒土地合理开发利用的潜力。

In order to explore the selenium content,spatial distribution characteristics and influencing factors of soil in Tiemenguan city,Xinjiang,3916 surface soil samples and 59 upstream mountain rock samples were systematically collected and analyzed.Sixteen analytical indicators such as selenium,pH,total water-soluble salt,cation exchange capacity,organic matter,total nitrogen,phosphorus,potassium and heavy metal elements in rock samples and soil samples were determined.Pearson correlation and principal component analysis were used to comprehensively study the indicators of soil types.The results showed that the average selenium content in the surface soil of the study area is 0.36 mg·kg^(-1),the selenium-rich soil area is 113.12 km^(2),and there is no selenium poisoning and heavy metal contaminated land.Soil selenium is mainly derived from limestone,siltstone and sandstone of the lower carboniferous Yeyungou formation.In addition to the influence of soil parent material and soil type,it is also affected by fertility indicators such as organic matter,cation exchange capacity,total nitrogen,phosphorus and potassium.The study on the current situation of land use types found that Tiemenguan city has the potential to improve the rational development and utilization of selenium-rich land.