南方喀斯特矿区稻田土壤镉污染的原位营养修复效果研究  

Preliminary Study on Effect of Cadmium Contaminated in Paddy Fields of Karst Mining Area In-situ Remediation

作　　者：赵茹 邵国胜[3] 胡钧铭[2] 蒋鑫 刘顺翱 李婷婷[2] 韦翔华[1] 刘超[1,2] ZHAO Ru;SHAO Guosheng;HU Junming;JIANG Xin;LIU Shun'ao;LI Tingting;WEI Xianghua;LIU Chao(College of Agriculture,Guangxi University,Nanning 530004;Agricultural Resource and Environment Research Institute,Guangxi Academy of Agricultural Sciences/Guangxi Key Laboratory of Arable Land Conservation,Nanning 530007;China National Rice Research Institute,Hangzhou 311401)

机构地区：[1]广西大学农学院,南宁530004 [2]广西农业科学院农业资源与环境研究所/广西耕地保育重点实验室,南宁530007 [3]中国水稻研究所,杭州311401

出　　处：《中国农学通报》2024年第23期75-80,共6页Chinese Agricultural Science Bulletin

基　　金：农业农村部产地环境污染防控重点实验室开放基金“广西宜州镉污染稻田安全利用技术异地验证与定位监测”(19cdhj-16);广西农业科学院创新团队项目“农业逆境生态调控技术研究”(桂农科2021YT040)。

摘　　要：针对南方喀斯特矿区的镉污染问题,本研究旨在评估不同营养修复剂对污染稻田土壤的原位修复效果。通过设置3个处理组:对照组(T_(1),不添加修复剂)、无机营养修复剂组(T_(2))及有机无机营养修复剂组(T_(3)),利用梯度扩散薄膜法(DGT)分析了水稻根际土壤中镉的形态变化和生物有效性,并探讨了这些变化与土壤质量之间的相关性。研究结果显示:(1)营养修复剂显著影响了稻田土壤中镉的形态分布,促进了可交换态镉向残渣态镉的转化。具体来看,与对照组相比,T_(2)、T_(3)分别降低了可交换态镉含量占比14.71%、5.88%,增加了可还原态镉含量占比8.51%、6.38%。虽然T_(3)对残渣态镉含量的影响不明显,但T_(2)使其增加了10%。(2)T_(2)、T_(3)2种营养修复剂均显著降低了水稻收获期根际土壤中镉的生物有效性,T_(2)、T_(3)分别降低了54.21%、50.47%。(3)与对照组比较,T_(2)、T_(3)显著提升了土壤的有机质(7.37%、7.50%)、pH(5.29%、17.06%)和阳离子交换量(12.24%、11.10%)。营养型修复剂利于矿区镉污染稻田土壤修复并实现土壤质量同步提升。There is an urgent need for cadmium pollution transfer risk and soil nutrient restoration technology in rice field in karst mining area of South China.To explore the effect of nutritional passivator on cadmium(Cd)contaminated paddy soil in mining areas,and to clarify its effect on the morphological transformation,bioavailability and soil quality of cadmium in the rhizosphere soil of rice,the in-situ remediation experiment of paddy soil was carried out.Three treatments were set up,including no passivator(T_(1)),inorganic nutritional passivator(T_(2))and organic-inorganic nutritional passivator(T_(3)).The gradient diffusion film(DGT)technique was used to study the bioavailability of Cd and Cd transformation in rhizosphere soil of the paddy field,and the biological correlation between Cd transformation,bioavailability of Cd and soil quality was evaluated in rhizosphere soil of the paddy field.The results showed that:(1)nutritional passivator affected the ratio of cadmium formation in cadmium-contaminated paddy soil.Nutritional passivator could promote the transformation of exchangeable cadmium to residual cadmium in soil.Nutritional passivator reduced the proportion of exchangeable cadmium content.Compared with T_(1)(control),the T_(2)and T_(3)decreased the proportion of exchangeable cadmium content in soil by 14.71%and 5.88%,respectively.Nutritional passivator increased the proportion of reducible cadmium content.Compared with T_(1)(control),the T_(2)and T_(3)increased the proportion of reducible cadmium content in soil by 8.51%and 6.38%,respectively.Nutritional passivator increased the proportion of residual cadmium content.Compared with T_(1)(control),the T_(2)increased the proportion of residual cadmium content in soil by 10%,T_(3)had no obvious changes.(2)The bioavailability of Cd in rhizosphere soil of Cd-polluted paddy fields was reduced by treatment with nutritional passivator.Compared with T_(1)(control),the T_(2)and T_(3)treatments decreased bioavailability significantly by 54.21%and 50.47%at harvest stage

关 键 词：隔污染稻田 原位修复 Cd形态转化 营养修复剂 喀斯特矿区 

分 类 号：S-3[农业科学]