新疆若羌县绿洲带土壤硒含量的空间分布及影响因素分析
Spatial distribution of selenium and its influencing factors in soils of oasis zone in Ruoqiang County, Xinjiang
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摘要: 为研究若羌县土壤Se含量、分布特征与土壤性质的关系，在研究区采集434个表层土壤样品，分析了若羌县土壤Se含量及其影响因素.结果表明，若羌县表层土壤Se含量变幅为0.06-0.47 mg·kg-1，平均值为0.18 mg·kg-1，总体属于中等、边缘及缺硒土壤，不存在硒中毒土壤.不同土壤类型中草甸土Se含量最高（0.23 mg·kg-1），盐土最低（0.13 mg·kg-1）.成土母质以洪积物发育的土壤Se含量最高（0.25 mg·kg-1），湖积物最低（0.14 mg·kg-1）.不同土地利用方式下，水田土壤Se含量最高（0.32 mg·kg-1）.研究区土壤MgO、有机碳Corg、黏粒含量、TN和铁锰氧化物是影响土壤Se含量的主要因素.Abstract: To evaluate selenium content and distribution, and to study its relationship with soil properties, 434 topsoil samples were collected. The results showed that selenium content ranged from 0.06 to 0.47 mg·kg-1 with average of 0.18 mg·kg-1. On the whole, the selenium level belonged to medium, marginal or deficient, with no Se-poisoning. Among soil types, meadow soil had the highest Se content(0.23 mg·kg-1), while saline soil had the lowest Se content(0.13 mg·kg-1). Among soil parent materials, the highest content was recorded in diluvial deposit with an average Se content by 0.25 mg·kg-1, while lake deposit was the lowest with an average by 0.14 mg·kg-1. In terms of land use, paddy soil had the highest Se content(0.32 mg·kg-1). MgO, Corg, clay contents, TN, iron and manganese oxides were the main factors, which affected soil selenium content.
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Key words:
- soil selenium content /
- influencing factors /
- Ruoqiang County
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