摘要
选择南京市郊某镉污染酸性稻田土壤开展田间小区和大区示范试验,分别研究新型土壤调理剂ISS的水稻降镉(Cd)效果和水稻–伴矿景天轮作模式下土壤Cd减量修复效果。结果表明:与对照比较,1.5~4.5 t/hm^(2)施用量的ISS调理剂对水稻产量无显著性影响,但显著降低糙米Cd含量35.4%~54.3%,且降Cd效果随着ISS调理剂施用量的增加而增加;ISS调理剂停施1年后,糙米Cd含量仍显著降低32.2%~44.2%,且糙米Cd含量与上一年度无显著性差异;相同施用量条件下,ISS调理剂处理的糙米Cd含量与生石灰处理间也无显著差异,进一步说明ISS调理剂稻米降Cd效果的长效性与稳定性。常规水稻–伴矿景天轮作体系中,水稻糙米Cd含量为0.19 mg/kg,低于0.2 mg/kg的限量标准(GB 2762-2022);水稻和伴矿景天地上部可分别从土壤吸收11.1 g/hm^(2)和99.5 g/hm^(2)的Cd,秸秆离田的Cd移除量分别占耕层土壤Cd总量的1.00%和8.96%。水稻–伴矿景天轮作是一种污染土壤Cd减量修复潜力较大的“边生产边修复技术”。
In the moderate and light cadmium(Cd)polluted acidic paddy soils in the suburbs of Nanjing,two field experiments were conducted to study the reduction effects of soil conditioner ISS on rice Cd accumulation and the rice-Sedum plumbizincicola rotation on soil Cd content,respectively.Compared with the control treatment,1.5–4.5 t/hm^(2) of ISS applications had no significant effect on rice yield,but significantly reduced Cd concentration in brown rice by 35.4%–54.3%,and the reduction of Cd concentration in brown rice increased with the increase of ISS application rate.One year after the application of ISS was stopped,Cd concentration in brown rice was still significantly reduced by 32.2%–44.2%,and Cd concentration in brown rice was insignificantly different from that of the previous year.There was also insignificant difference in Cd concentrations in brown rice between ISS and quicklime treatments under the same application rate,which further demonstrated the long-term effect and stability of ISS conditioner on the reduction of rice Cd accumulation.In the rotation system of rice and hyperaccumulator Sedum plumbizincicola,Cd concentration in brown rice was 0.19 mg/kg which was lower than the limit standard of 0.2 mg/kg(GB 2762-2022).The total uptakes of Cd in the shoots of rice and Sedum plumbizincicola were 11.1 g/hm^(2) and 99.5 g/hm^(2),which accounted for 1.00% and 8.96% of the total Cd of soil,respectively.Thus,the rotation of rice-Sedum plumbizincicola is a“phytoremediation coupled with agro-production”technology with great potential for the reduction remediation of Cd polluted soil.
作者
周鑫
余贤安
张金福
周通
杨红飞
吴龙华
ZHOU Xin;YU Xian’an;ZHANG Jinfu;ZHOU Tong;YANG Hongfei;WU Longhua(School of Ecology and Environment,Anhui Normal University,Wuhu,Anhui 241002,China;State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 211135,China;Nanjing City Gaochun Arable Land Quality Protection Station,Nanjing 211300,China)
出处
《土壤》
北大核心
2025年第5期1115-1120,共6页
Soils
基金
南京市高淳区受污染耕地安全利用项目(2021-06)资助。
关键词
镉
水稻土
钝化修复
植物吸取修复
安全利用
Cadmium
Paddy soil
Immobilization remediation
Phytoextraction
Safe utilization
