桂平富硒土地改良效果初步对比研究

A Preliminary Study of Improving Effect of Se-rich Soil in Guiping,Guangxi

桂平富硒土地中大量含有As、Cd、Pb等有毒有害元素,对于如何降低有毒有害元素含量和提高Se的利用率,成为了生态农业和土地改良中所关注的焦点。此次土地改良是使用石灰加有机肥相混合的方式,通过对桂平地区水稻、花生、火龙果等种植区土地改良前后的土壤和植物样品进行分析,结果显示:(1)改良后植物组织及果实中的Se含量均有所提高;(2)植物组织及果实对As、Cd、Pb的吸收量减少。As、Cd更多地被固定在土壤中,它们在土壤中的含量增加,而土壤中的Pb含量变化不大。这表明,桂平富硒土地通过改良能较好地提高硒的利用率,并为大规模富硒产业的培育提供技术保障。

The Se-rich soil in Guiping,Guangxi is rich in poisonous and harmful elements such as As,Cd and Pb.It has become a focus in ecological agriculture to reduce the content of the poisonous and harmful elements and enhance the utilization ratio of Se.The method of soil improvement is to use lime-organic fertilizer mixture.The soil and plant samples in the rice,peanut,and pitaya growing areas before and after soil improvement in Guiping are analyzed,respectively.The results show that after soil improvement,content of Se in fruits and seedlings increases,while contents of As,Cd and Pb reduces which indicates that utilization ratio of Se increases.