土壤调理剂对不同成土母质镉污染稻田的修复效果

Remediation Effects of Soil Conditioners on Cd Contaminated Paddy Fields from Different Soil Parent Materials

在湖南宁乡、湖北大治、江西九江3地选择由不同母质发育而成的镉污染土壤进行早、晚稻连续施用土壤调理剂的田间试验,考察土壤调理剂对土壤pH值、土壤Cd有效态含量、稻米Cd含量等的影响。结果表明:与不施土壤调理剂的对照相比,不同母质发育而成的土壤,施用土壤调理剂后其pH值提高了0.32~0.80个单位,土壤中有效Cd含量下降了22.05%~66.10%,稻米Cd含量减少了33.22%~65.96%;同时,施用土壤调理剂还能提高水稻的经济性状,增加水稻产量,土壤调理剂用量为100 kg/667m^2时,增产率为5.38%~8.10%;土壤调理剂用量为150 kg/667m^2时,增产率为9.32%~11.15%。这说明土壤调理剂可有效改善酸性土壤理化性质,降低土壤镉的可移动性,减少水稻镉吸收,提升稻谷产量,进而提高经济效益。

In order to study the effects of“Dasanyuan”soil conditioner on soil pH,soil available Cd content,and rice Cd content for spring and autumn rice planting,soil samples of Cd contaminated paddy fields from different parent materials were collected in Ningxiang of Hunan,Jiujiang of Jiangxi and Dazhi of Hubei.The results showed that compared with the control(no soil conditioner),adding“Dasanyuan”soil conditioner increased soil pH values by 0.32-0.80 units,decreased soil available Cd contents by 22.05-66.10%,and decreased rice Cd contents by 33.22-65.96%;it also improved the economic characters and yield of rice.Applied with 1500kg/hm2 and 2250kg/hm^2 of“Dasanyuan”soil conditioner,the rice yields increased 5.38%-8.10%and 9.32-11.15%,respectively.The above results indicate that“Dasanyuan”soil conditioner can effectively improve soil physical and chemical properties,lower the mobility of cadmium in soil,reduce cadmium uptake by rice,increase rice yield,and further enhance economic returns.