摘要
在宜兴地区随机采集13个土壤剖面和38个表层土壤样品，研究土壤全硒含量随土种和土壤深度的变化。结果表明，表土全硒变幅在0．33～2．25μg·g^-1之间，平均1．03μg·g^-1，80％以上的样品处于富硒水平。土种间表土硒含量存在显著差异，并且水田土壤显著高于早地；土壤全硒含量的剖面深度变化依土地利用方式而异，在早地土壤中呈线性递降，水稻土中呈指数递降，表土硒含量变异主要受有机质含量的控制。
Thirteen soil profiles and 38 soil samples from the plow layers of some randomly chosen crop fields in Yixing were collected in an experiment to study variation of total selenium in soils and soil profiles. The soil samples were digested in HNO3- -HClO4-HF （ V： V： V = 8：1：2） solution and concentrations of total Se were determined with atomic fluoresce spectroscope. Total Se of the tested top soil samples ranged from 0.33 to 2.25 μg·g^-1 and over 80% of the top soil samples exceeded 0.45μg·g^-1 ,the critical value for Se-rich soils. While Se accumulation in top soil was observed in all the soils tested, total Se varied with depth in soil profile, differed from soil to soil, and affected by land use. Total Se in dry croplands tended to be lower than in paddy fields and higher in soils rich in SOM and iron oxyhydrates. Statistical data show dominance of SOM in Se binding and accumulation in the studied soils. The findings here evidence that the area is high in top soil Se. However,translocation of Se from soil to plant or food crops needs further studies.
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2006年第3期61-64,共4页
Journal of Ecology and Rural Environment
基金
国土资源部
江苏省政府重大项目(EG0008)
关键词
江苏
宜兴
水稻土
全硒
分布
Jiangsu
Yixing
paddy soil
total selenium
distribution
