硅钙镁肥对不同母质稻田土壤水稻Cd吸收累积的影响及其差异研究  

Study on the Differences of the Effects of Si-Ca-Mg Fertilizer on Uptake and Accumulation of Cadmium in Rice Plants on Different Soil Types

作　　者：李欣阳 龙坚 董霞 蒋凯 王树兵 刘文辉 侯红波 彭佩钦[1,2] 廖柏寒 LI Xin-yang;LONG Jian;DONG Xia;JIANG Kai;WANG Shu-bing;LIU Wen-hui;HOU Hong-bo;PENG Pei-qin;LIAO Bo-han(College of Environmental Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Engineering Laboratory for Control of Rice Quality and Safety,Central South University of Forestry and Technology,Changsha410004,China,3.Agricultural Integrated Service Center of Changsha County,Huang Xing Town,Changsha 410100,China,4.AgriculturalIntegrated Service Center of Ningxiang City,Shuang Jiangkou Town,Changsha 410601,China)

机构地区：[1]中南林业科技大学环境科学与工程学院,湖南长沙410004 [2]中南林业科技大学稻米品质安全控制湖南省工程实验室,湖南长沙410004 [3]长沙县黄兴镇农业综合服务中心,湖南长沙410100 [4]宁乡市双江口镇农业综合服务中心,湖南长沙410601

出　　处：《湖南生态科学学报》2018年第3期1-9,共9页Journal of Hunan Ecological Science

基　　金：国家科技支撑计划项目(2015BAD05B02);农业部财政部重大专项(农办财函[2016]6号);湖南省重点学科建设项目(2006180)

摘　　要：为研究硅钙镁肥(GF)对不同母质稻田土壤水稻Cd吸收累积的影响及其差异,选取黄泥田(板页岩母质发育水稻土)和麻砂泥(花岗岩母质发育水稻土)进行水稻盆栽试验,分析各生育时期土壤pH值与CEC变化、土壤溶液中Cd浓度、水稻各部位(根、茎、叶、谷壳和糙米) Cd含量及水稻全株总累积量、水稻根表铁膜Cd、Fe含量与总累积量.结果表明:稻田土壤施用GF显著降低了土壤溶液Cd浓度;施用GF显著提升了土壤pH和CEC;施用GF降低了水稻根、茎、叶、谷壳与糙米中的Cd含量,显著降低水稻全株Cd累积量.稻田土壤施用GF促进了水稻根表铁膜的形成,增加了各生育时期DCB-Fe、降低了DCB-Cd含量,抑制了Cd由根部向上迁移;稻田土壤施用GF,黄泥田与麻砂泥水稻糙米Cd含量降低至0.11 mg/kg和0.15 mg/kg,均低于国家标准.相关性分析表明,土壤pH与土壤溶液Cd浓度、水稻糙米Cd含量呈显著(P<0.05)或极显著负相关(P<0.01),水稻根表铁膜Fe累积量与DCB-Cd、根与糙米Cd含量呈极显著负相关(P<0.01); GF使叶对糙米Cd再转运贡献率降低5.88%(黄泥田)和12.80%(麻砂泥).稻田土壤施用GF可有效阻控水稻对Cd的吸收累积,且麻砂泥效果优于黄泥田.In order to study the effect of Si-Ca-Mg fertilizer （GF） on uptake and accumulation of Cdin rice plants on two typical paddy soils,the rice pot experiment was conducted in the yellow clayey soil（YCS） developed from plate shale parent materials and the granitic sandy soil （GSS） developed fromgranite parent materials.Changes of soil pH and CEC in different growing periods,Cd concentrations insoil solution,Cd contents in rice tissues （roots,stems,leaves,husks and brown rice） and total Cd accu-mulation in rice plants,Content and total accumulation of Cd and Fe in iron plaque were analyzed.The re-sults showed that application of GF in rice soil decreased significantly the concentration of Cd in soil solu-tion,increased significantly soil pH and CEC,reduced Cd contents in rice roots,stems,leaves,husks andbrown rice,and decreased significantly the total Cd accumulation in rice plants.Application of GF in ricesoil promoted the formation of the iron plaque,increased the content of DCB-Fe in different growing peri-ods,reduced the content of DCB-Cd and inhibited the upward migration of Cd from root.When GF was ap-plied in the rice soil,the Cd content of brown rice in YCS and GSS decreased to 0.11 and 0.15 mg / kg,both lower than the national standard for brown rice Cd 0.2 mg / kg.Correlation analysis presented signifi-cant （P〈0.05） and extremely significant （P〈0.01） negative relationship between pH in soil solution andCd concentration in soil solution and Cd content in brown rice,and the extremely significant negative rela-tionship between Fe accumulation in iron plaque and DCB-Cd and Cd contents in root and brown rice.Thecontribution rate of leaves to Cd remobilization of brown rice by GF was reduced by 5.88% （in YCS） and12.80% （in GSS）.Application of GF in rice soil can effectively prevent and control the absorption andaccumulation of Cd in rice,and the effect of GSS was better than that of YCS.in rice plants on two typical paddy soils,the rice pot experiment was conducted in the yellow

关 键 词：CD 土壤 硅钙镁肥 水稻 根表铁膜 再转运 

分 类 号：S143[农业科学—肥料学]