摘要
【目的】探讨酸性稻田土壤添加碱性物料的精准修复技术。【方法】基于利用三种碱性调酸物料(生石灰、石灰石粉、牡蛎壳粉)分别调节试验田土壤至两种不同目标pH,测定试验田土壤有效态Cd含量、土壤理化性质、稻米产量、稻米Cd含量。【结果】不同目标pH下施用三种碱性物料均使土壤有效态Cd含量较对照组显著降低,当目标pH为6.5时降低率在31.52%~45.68%,目标pH为7.0时降低率更为显著,降低范围在48.89%~50.45%。三种碱性物料的施入均具有改善土壤理化性质,保持土壤养分的作用。稻米Cd含量显著降低(P<0.05),其中施用石灰石粉调整土壤pH到7.0时降幅最高,达60.13%。碱性材料实施后导致水稻产量出现小幅度减产。【结论】研究区酸性稻田土壤Cd污染风险管控,建议以7.0为目标pH施入石灰石粉,以达到最佳综合修复效果。
【Objective】It is to explore the precise remediation technology of adding alkaline materials to acidic paddy soil.【Method】Based on the use of three alkaline acid regulating materials(quicklime,limestone powder,and oyster shell powder)to regulate the experimental soil to two different target pH values,the cadmium availability,soil physicochemical properties,rice yield,and rice cadmium content of the experimental soil were measured.【Result】The application of three alkaline materials at different target pH values significantly reduced the available cadmium content in the soil compared to the control group.When the target pH was 6.5,the reduction rates ranged from 31.52%to 45.68%,and when the target pH was 7.0,the reduction rates were more significant,ranging from 48.89%to 50.45%.The ap-plication of three alkaline materials had the effect of improving soil physicochemical properties and main-taining soil nutrients.The cadmium content in rice significantly decreased(P<0.05),with a maximum decrease of 60.13%when applying limestone powder to adjust the soil pH to 7.0.The implementation of alkaline materials resulted in a small reduction in rice yield.【Conclusion】It is suggested that applying limestone powder with a pH value of 7.0 as the target to achieve the best comprehensive restoration effect according to the risk control of Cd pollution in acidic paddy soil in the experimental area.
作者
陈艳秋
管权
李锐明
焦位雄
张丽
杨伟
杨正兰
林勇
CHEN Yanqiu;GUAN Quan;LI Ruiming;JIAO Weixiong;ZHANG Li;YANG Wei;YANG Zhengan;LIN Yong(Anning Planting Industry Service Center,Kunming 650300,China;Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China;Kunming Agricultural Product Quality Safety Center,Kunming 650100,China;Rural Energy and Environmental Protection Workstation,Shilin Yi Autonomous County,Kunming 652200,China)
出处
《湖南生态科学学报》
CAS
2023年第4期26-32,共7页
Journal of Hunan Ecological Science
基金
国家自然科学基金项目(41877403)。
关键词
酸性稻田
CD污染
碱性物料
修复效应
acidic soil
cadmium pollution
alkaline materials
remediation effect
