矿区农田施用木炭和硫酸亚铁对水稻吸收累积镉砷的影响

Effects of Charcoal and Ferrous Sulfate Amendments on Rice Cd and As Uptake in a Contaminated Paddy Soil in Mining Area

通过田间小区试验,文章研究了矿区土壤连续2年施用木炭和硫酸亚铁对水稻吸收累积镉、砷的影响,测定不同处理条件下土壤重金属形态和水稻各器官重金属含量。结果表明:施用木炭和硫酸亚铁可以促进水稻的生长发育,增加水稻产量。添加木炭可以提高土壤pH,显著降低土壤中有效态镉含量,其最大降低幅度2016年为10.2%,2017年达到33.1%;添加硫酸亚铁处理可以显著降低土壤中有效态砷含量,其最大降低幅度2016年为34.2%,2017年达41.7%。添加木炭处理能显著降低水稻籽粒中镉含量,但是会增加籽粒中砷含量;叶面喷施硫酸亚铁能显著降低水稻籽粒中镉含量,同时也能降低水稻对于砷的吸收。

Field experiment was conducted to study the effects of adding charcoal and ferrous sulfate to the soil on accumulation of Cd and As in rice for two consecutive years. The speciation of heavy metal in soil and heavy metal uptake by rice under different treatments were determined. The results showed that the amendments of charcoal and ferrous sulfate could promote the rice growth and increase rice yield. The addition of charcoal could increase soil pH value, and significantly reduce the available cadmium content in soil, with the maximum reduction rate of 10.2% in 2016 and 33.1% in 2017, respectively. Adding ferrous sulfate treatments could significantly reduce the available arsenic content in soil, and its maximum reduction in2016 was 34.2%, up to 41.7% in 2017. Adding charcoal could significantly reduce the cadmium content in rice grains, but it would increase the arsenic content in the grains. Foliar spraying ferrous sulfate could significantly reduce the cadmium content in rice grains, but also reduce the rice arsenic absorption.