江西龙南地区富硒土壤资源开发可行性研究
A feasibility study of selenium-rich soil development in Longnan County of Jiangxi Province
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摘要: 多目标区域地球化学调查结果显示,江西龙南地区表层土壤Se 平均含量为0.34 mg/kg,总体足硒,局部富硒,且土壤中重金属元素含量处于安全水平?异常查证结果表明,富含硒的基岩是富硒土壤分布的控制因素?在研究区发现天然富硒水稻?富硒大豆优质农产品,其中大豆的富硒率达100%?土壤中有效Se 与总Se 呈极显著的正相关,总Se 含量增大可增加有效Se 量;有效Se 与阳离子交换量(CEC)?N?P呈较显著的正相关,土壤中粘土矿物及有机质对Se 有较强的吸附?络合作用,且土壤中有效Se 主要以亚硒酸盐形式存在?水稻?大豆中Se 的生物富集系数均与土壤Se?N呈显著负相关,与土壤K2O呈显著正相关?Abstract: The results of regional geochemical survey show that selenium content of topsoil is 0.34 mg/kg, which indicates that the soil in the study area is selenium-sufficient or selenium-rich. The results also show that the content of heavy metals in soil is at a safe level. Geochemical anomaly inspection reveals that the Se- rich bedrock controls the distribution of Se- rich soils. There are many kinds of selenium-rich and high-quality agricultural products in the study area, such as selenium-rich rice and soybean, with the proportion of the selenium-enriched soybean reaching 100%. There is a significant positive correlation between plant available selenium and total selenium, and a remarkable correlation between plant available selenium and soil CEC, N and P; the clay minerals and organic matters in soils have a strong adsorption and solidification function for selenium. The available selenium mainly exists in the form of selenite. The biological enrichment coefficients of selenium show a significant negative correlation with soil total selenium and nitrogen but a positive correlation with K2O.
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Keywords:
- selenium-rich /
- heavy metal element /
- soil development /
- transportation
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