石灰降低稻米镉含量的效果及其影响因素  

Effects of Lime on Reducing Cadmium Content in Rice and Its Influencing Factors

作　　者：胡召华 靳磊 朱捍华[3] HU Zhao-hua;JIN Lei;ZHU Han-hua(Agriculture Commission of Xiangtan City, Xiangtan 411100, PRC;Hunan Academy of Microbiology, Changsha 410009, PRC;Institute of Subtropical Agriculture, the CAS, Changsha 410125, PRC)

机构地区：[1]湘潭市农业委员会,湖南湘潭411100 [2]湖南省微生物研究院,湖南长沙410009 [3]中国科学院亚热带农业生态研究所,湖南长沙410125

出　　处：《湖南农业科学》2017年第8期20-23,共4页Hunan Agricultural Sciences

基　　金：中国科学院STS项目(KFJ-STS-ZDTP-008)

摘　　要：为探明施石灰降低镉污染酸性稻田米镉含量的效果及其影响因素,在湘潭市16个不同地点,开展石灰施用试验。以稻米镉含量的降幅为主要评价指标,分析了管理措施和土壤环境条件对施石灰降低稻米镉含量效果的影响。试验结果显示,施用生石灰750~1 800 kg/hm^2,土壤pH值平均提升0.16个单位,稻米镉平均含量由对照的0.29 mg/kg降至0.13 mg/kg。石灰施用量以1 800 kg/hm^2最佳,其稻米平均降幅可达58.3%。土壤本底pH值低于6.5时,随pH值的升高,施石灰降低稻米镉含量的效果增强。而随着土壤有机质含量和CEC的升高,施石灰降低稻米镉含量的效果呈明显的减弱趋势。In order to find out the effect of lime on reducing cadmium content in rice field polluted by acid cadmium pollution and its influencing factors,the lime test was carried out at16different sites in Xiangtan.Taking the decline of cadmium content of rice as the main evaluation index,the effects of management measures and soil environment conditions on the effect of lime on reducing cadmium content in rice were analyzed.The results showed that applying the lime750-1800kg/hm2,the soil pH value increased by0.16units on average,and the average cadmium content of rice decreased from0.29mg/kg to0.13mg/kg.The optimum amount of lime was1800kg/hm2,and the average decrease of cadmium content in rice was58.3%.When soil background pH value was lower than6.5,with the increase of pH value,the effect of lime on lower the cadmium content in rice was enhanced.With the increase of soil organic matter content and CEC,the effect of lime on lower the cadmium content of rice decreased obviously.

关 键 词：石灰 土壤 镉污染 水稻 管理措施 土壤环境条件 

分 类 号：S511[农业科学—作物学]