基于富硒土壤的重金属污染风险及低累积水稻筛选OA

A heavy metal pollution risk investigation was conducted in the selenium-rich soil of Guigang,Guangxi.Three season field experi-ments were conducted to screen rice varieties with high accumulation of selenium and low accumulation of heavy metals,providing basic data and technical support for the development of selenium-rich soil resources and the safe production of selenium-rich agricultural products.The re-sults showed that:Se content in the surface soil of the experimental area reached the selenium-rich standard,and Cd content exceeded the risk screening value,with an exceeding rate of 55.00%;Cd in the surface soil mainly existed in the form of ion exchange,with strong activity and high ecological risk;Se content in the brown rice produced in the experimental area reached the selenium-rich rice standard,Cd content excee-ded the standard limit value,with an exceeding rate of 85.00%,and the inorganic arsenic content also exceeded the limit value,with an excee-ding rate of 50%;three seasons of screening rice varieties could produce selenium-rich rice when planted in the experimental area.For early rice,two varieties,Shenyou 9516 and Wanxiang 696,were selenium-rich and low cadmium varieties;for late rice,Yexiangyou 2 and Yexiangy-ouyousi were the superion selenium-rich and low cadmium varieties;Shenyou 9516 had the potential for selenium-rich,low cadmium,and low arsenic synchronously;Cd content in brown rice,which was screened for selenium-rich and low accumulation in the experimental area,still excee-ded the limit value.Other remediation measures need to be taken to ensure the safe production of selenium-rich soil in the experimental area.