施用铁锰对土壤砷形态及水稻吸收砷的影响  

Effects of Iron and Manganese Application on Soil Arsenic Fractions and Arsenic Uptake by Rice

作　　者：李志明 丁氏祝 奇奇格 雷静 顾明华[1,2] 陈宏[1] LI Zhi-ming;DING Shi-zhu;QI Qi-ge;LEI Jing;GU Ming-hua;CHEN Hong(Guangxi University of Agriculture,Guangxi Nanning 530004,China;Guangxi Key Laboratory of Agricultural Environment and Agricultural Product Safety,Guangxi Nanning 530004,China;Agricultural and Animal Husbandry Industry Development Research Institute of Guangxi University,Guangxi Nanning 530004,China)

机构地区：[1]广西大学农学院,广西南宁530004 [2]广西农业环境与农产品安全重点实验室,广西南宁530004 [3]广西大学农牧产业发展研究院,广西南宁530004

出　　处：《西南农业学报》2020年第8期1722-1728,共7页Southwest China Journal of Agricultural Sciences

基　　金：国家自然科学基金项目(41561092,41967045)。

摘　　要：【目的】分析不同铁和锰施用量对砷污染水稻土砷形态及水稻吸收砷的影响,为砷污染农田治理研究与实践提供理论依据。【方法】开展砷污染土壤水稻盆栽试验,设外源铁和锰不同施用量Mn0Fe0(对照)、Mn400Fe0、Mn800Fe0、Mn0Fe400、Mn400Fe400和Mn800Fe400共6个处理,测定各处理的土壤pH、土壤砷形态、铁锰氧化物形态、水稻地上部砷含量及分蘖期水稻地上部生物量,对土壤pH、砷形态、铁锰氧化物含量与水稻地上部砷含量进行相关性分析。【结果】与对照相比,施用铁锰均能显著降低土壤pH(P<0.05,下同);Mn0Fe400和Mn800Fe400处理可显著增加土壤中无定形态铁氧化物含量,Mn400Fe0、Mn800Fe0、Mn400Fe400和Mn800Fe400处理可显著增加土壤中各种锰氧化物含量;施用铁和锰可显著降低土壤中非专性吸附态砷和专性吸附态砷含量,显著提高土壤残渣态砷含量(Mn800Fe0除外);Mn400Fe0、Mn800Fe0、Mn0Fe400、Mn400Fe400和Mn800Fe400处理可分别显著降低分蘖期水稻地上部砷含量85.9%、83.2%、82.8%、86.3%和92.1%;施用铁和锰可显著提高水稻地上部鲜重。相关性分析结果显示,水稻地上部砷含量与非专性吸附态砷、专性吸附态砷含量和pH呈极显著正相关(P<0.01,下同),与残渣态砷含量呈极显著负相关;土壤残渣态砷含量与土壤络合态铁含量呈极显著正相关,与pH呈显著负相关。逐步回归分析结果显示,影响水稻地上部砷含量的主要因子为pH和残渣态砷,而影响土壤残渣态砷含量的主要因子为络合态铁。【结论】施用铁和锰可降低砷污染水稻土的pH,促进铁和锰氧化物形成,改变土壤中砷的赋存形态,降低土壤砷的有效性及水稻地上部的砷含量。【Objective】In order to provide theoretical basis for the research and practice of arsenic pollution in farmland,the effects of different application amounts of exogenous iron and manganese on arsenic forms in arsenic polluted rice soil and arsenic uptake by rice were studied.【Method】A pot experiment of rice in arsenic polluted soil was carried out to set up different levels of exogenous iron and manganese:Mn0Fe0(control),Mn400Fe0,Mn800Fe0,Mn0Fe400,Mn400Fe400 and Mn800Fe400.To determine the soil pH,arsenic forms,iron manganese oxide forms,the arsenic content in the upper ground of rice and biomass in the upper ground of rice at tillering stage under different treatment modes,and to analyze the correlation between the soil pH,arsenic form,iron manganese oxide content and the arsenic content in the upper ground of rice.【Result】Compared with the control group,it could be found that iron and manganese treatment could significantly reduce soil pH(P<0.05,the same as below).While Mn0Fe400 and Mn800Fe400 treatments could significantly increase the content of amorphous iron oxides in the soil,Mn400Fe0,Mn800Fe0,Mn400Fe400 and Mn800Fe400 treatments could significantly increase the content of various manganese oxides in the soil.The application of iron and manganese treatment could significantly reduce the arsenic content of non specific adsorption state and specific adsorption state,increasing the arsenic content of residual state significantly(except for Mn800Fe0).The application of iron and manganese treatment could significantly reduce the content of arsenic in the upper part of rice at tillering stage,and the content of arsenic in the upper part of rice at Mn400Fe0,Mn800Fe0,Mn0Fe400,Mn400Fe400 and Mn800Fe400 treatment could reduce 85.9%,83.2%,82.8%,86.3%and 92.1%respectively.The application of iron and manganese treatment could significantly promote the growth of rice aboveground.By summarizing the results of correlation analysis,it found that there was a very significant positive correlation between the arse

关 键 词：水稻 砷污染水稻土 铁锰氧化物 砷形态 

分 类 号：S156.99[农业科学—土壤学] S511.4[农业科学—农业基础科学]