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

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。

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 dee 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 fimction 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.