湖南益阳农业产业园区土壤硒元素分布及影响因素

On Selenium Distribution in Soil and Factors Influencing Such Distribution in Yiyang Agricultural Industrial Zone of Hunan Province

益阳市属于富硒土壤地区,为促进全市传统农业产业的提升发展,合理开发利用优质土地资源,打造富硒农产品品牌.选择市内18个农业产业园,开展1∶2000富硒土壤详细调查,对表层土壤1916件样品进行了硒元素及有效硒实验分析,结果表明:益阳地区表层土壤硒元素的分布整体呈中部高,东西两侧低的特点,18个工作区内表层土壤硒元素各区硒有效态含量变幅范围为0.001~10.619 mg/kg,平均值为0.027 mg/kg,表明区内土壤硒元素分布较不均匀,不同地质背景对土壤硒元素含量具有显著性影响,不同土壤类型和地质单元硒含量存在一定差异.

In order to promote the growth and development of traditional agricultural industry in Yiyang City,where abundant selenium is found in soils,it is necessary to rationally develop and utilize high-quality land resources,scientifically delimitate zone specific agricultural industrial zones for crop cultivation,and create a brand of selenium-rich agricultural products.18 agricultural industrial zones in the city have been selected for a detailed investigation on 1:2000 selenium-rich soils,and 1916 topsoil samples have been analyzed for selenium and effective selenium.Results show an average value of selenium of 0.54 mg/kg and a median value of 0.44 mg/kg in the topsoil of 18 working areas and a coefficient of variation of 169.51%,which concludes that selenium is unevenly distributed in soils of the area.The various geological backgrounds significantly affect the content of selenium in soils,and the selenium content of Quaternary and Cambrian soils is higher among the soil-forming rocks.