土壤学报2013，Vol.50Issue(3)：548-555,8.
不同土壤的还原状况对铁镉形态转化和水稻吸收的影响
EFFECTS OF SOIL REDOX CONDITION ON THE TRANSFORMATIONS OF Fe AND Cd IN SOILS AND THEIR UPTAKE BY RICE
摘要
Abstract
In a pot experiment rice seedlings were planted in mesh bags that were filled with vermiculite to simulate rhizosphere and the bags were imbedded separately in submerged red,paddy and saline soils for cultivation for 13 days.Results show that during the rice cultivation period,pH in the red,paddy and saline soils varied in the range of 6.05 ～6.78,6.47 ～ 7.33 and 6.47 ～ 7.44,respectively.In the OM (organic matter) treatments,all the soils,regardless of rhizospheric or nonrhizospheric,decreased in pH,except for rhizospheric red soil,which increased significantly.Eh in all the rhizospheric soils of the control treatments lingered within 233 ～ 385 mV,and treatment with OM reduced rhizospheric Eh,but increased nonrhizospheric Eh of the red and paddy soils.Oxide-Fe fraction accounted for more than 90％ of the reductively dissolved Fe and vermiculite-absorbed Fe,which was significantly correlated with soil solution Eh and pe + pH,indicating that Fe redox reactions occurred simultaneously on the surfaces of the soils and the vermiculites,but in opposite directions.The formation of iron plaque on root surface of the rice seedlings was related to redox conditions in rhizosphere.In the rhizospheres of CK (higher in Eh),Fe content on the root surface decreased with increasing pH,whereas in the rhizospheres of OM treatment (lower in Eh),Fe increased with increasing pH.In the red soil,iron plaques on the root surface retarded Fe absorption,while in the paddy and saline soils it acted reversely.Cd content on the root surface was significantly and positively related to Cd in root and in shoot.In the red soil iron plagued on the root surface retarded adsorption and uptake of Cd by rice,whereas in paddy and saline soils,it acted reversely too.关键词
水稻/根表铁膜/镉/形态/吸收Key words
Rice/Iron plaque on root surface/Cd/Fractions/Uptake分类
资源环境引用本文复制引用
陈雪,刘丹青,王淑,杨亚洲,李玉姣,胡浩,张春华,葛滢..不同土壤的还原状况对铁镉形态转化和水稻吸收的影响[J].土壤学报,2013,50(3):548-555,8.基金项目
国家自然科学基金项目(30700479)、教育部高等学校博士点基金项目(20090097110035,20110097110004)、中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室开放基金项目(Y052010019)、国家级大学生创新训练计划项目(091030726)、南京农业大学本科生SRT项目(1007A14)共同资助 （30700479）
