贵州省长顺县耕地土壤硒元素分布及其影响因素分析

Analysis on Soil Selnium Distribution and Its Influencing Factors in Changshun County,Guizhou Province

耕地质量地球化学调查表明,长顺县表层土壤硒含量为0.06~5.68 mg/kg,均值为0.64 mg/kg,硒地球化学等级中等偏上;空间分布呈弱分异型,高值区整体呈南北向带状分布;垂向上土壤硒含量随深度增加;区内不同土壤类型、土地利用类型硒含量差异较小;富硒土壤分布与易风化的碳酸盐岩,特别是含煤岩系地层及硅质岩的地层分布一致;土壤Se含量与V、Cr、Cu、Mo、Ni金属元素以及有机质含量具有显著正相关性,与土壤p H呈负相关,与铁氧化物及硅铝氧化物皆有线性相关性。

The cultivated land quality geochemical survey shows that the selenium content of the surface soil ranged from 0.06 mg/kg to 5.68 mg/kg,with an average value of 0.64 mg/kg.Selenium geochemistry grade is medium to above in Changshun county The spatial distribution is weakly differentiated,and the high-value area is spread in north-south direction.The content of selenium in vertical soil increased with the depth.The difference of selenium content among different soil types and land use types was small.The distribution of seleniumrich soils is consistent with that of easily weathered carbonate rocks,especially the coal-bearing strata and siliceous rocks.The content of Se in soil was positively correlated with the content of V,Cr,Cu,Mo,Ni and organic matters,negatively correlated with the pH of soil,and linearly correlated with iron oxides and Si-Al oxides.