贵州铜仁碧江区耕地土壤硒富集分布特征及影响因素研究

Study on the characteristics and influencing factors of soil selenium enrichment and distribution in Bijiang District,Tongren City,Guizhou Province

硒是重要的人体必需微量元素,对特色农业发展起着重要的助力作用。碧江区土壤硒元素含量平均值超过贵州省及全国硒含量均值。富硒耕地面积达29.4268万亩,具有较大的富硒资源开发潜力。成土母岩为炭质页岩所形成的土壤中硒元素含量高于其他类型成土母岩所形成的土壤,强酸性土壤中硒元素含量平均值高于其他酸碱度等级土壤,水田中硒元素含量平均值显著高于旱地、果园、水浇地等其他类型土地。成土母质是土壤中硒元素的主要来源及影响因素,pH值、有机质、土壤质地等理化条件对土壤硒元素有一定影响。

Selenium is an important essential trace element for human body and plays an important role in the development of characteristic agriculture.The average selenium content in the soil of Bijiang is higher than the average selenium content in Guizhou province and the whole country.The cultivated land area rich in selenium has 294,268 mu,which has a great potential for developing selenium-rich resources.Carbon shale soils contain more selenium than other types of rock soils.The average content of selenium in the strongly acidic soil was higher than that in the soil with other pH grades.The average content of selenium in paddy field was significantly higher than that of other land types such as dry land,orchard and irrigated land.Soil parent material is the main source and influencing factor of selenium in soil,and physical and chemical conditions such as pH value,organic matter and soil texture have definite influence on soil selenium.