Remediation Effects of Water Management and Lime Application on Seasonally-Fallowed Cd-Contaminated Paddy Fields

作     者：ZHANG Zi-ye XIE Yun-he HUANG Bo-jun JI Xiong-hui LIU Zhao-bing WEI Wei 张子叶;谢运河;黄伯军;纪雄辉;刘昭兵;魏维

作者机构：Longping Branch of Graduate SchoolHunan UniversityChangsha 410125PRC Hunan Institute of Agro-Environment and EcologyKey Lab of PreventionControl and Remediation of Soil Heavy Metal Pollution in Hunan ProvinceChangsha 410125PRC Southern Regional Collaborative Innovation Center for Grain and Oil Crops in ChinaChangsha 410125PRC Ministry of Agriculture’s Key Lab of Agro-Environment Institute in the Midstream of Yangtze River PlainChangsha 410125PRC Foreign Economic ＆ Technical Cooperation CenterHunan Province’s Department of AgricultureChangsha 410005PRC 

出 版 物：《Agricultural Science & Technology》 (农业科学与技术（英文版）)

年 卷 期：2018年第19卷第1期

页      面：33-40页

学科分类：12[管理学] 1204[管理学-公共管理] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 090101[农学-作物栽培学与耕作学] 09[农学] 0901[农学-作物学] 120405[管理学-土地资源管理] 

基　　金：水利部公益性行业科研专项项目(2015 01019) 湖南省农业科学院科技创新项目(2017JC57) 长沙市科技计划项目(kq1703010) 国家水稻产业体系岗位科学家(CARS-01-28)~~ 

主　　题：Rice Water management Lime application Seasonal fallow Cadmium pollution Heavy metal 

摘      要：In the light of the national policy of fallow, this study was conducted to determine how the different water management and lime application would affect soil physical and chemical properties, rice yield and cadmium （Cd） content of rice in fallow season. The results showed that, compared with the arid fallow, the waterlogging fallow decreased the soil pH value whereas signifcantly increased the soil organic matter content and the cation exchange quantity, and reduced the soil effective cadmium content and the rice cadmium content whereas could increase the rice yield to a certain extent. In the fooded fallow or the dry fallow, the application of lime mainly depended on the alkali conditioning of lime and the antagonistic effect of Ca2＋, which could signifcantly reduce the cadmium content of rice, and its effect would increase linearly with the increase of lime dosage, whereas had no significant effect on soil organic matter content and cation exchange quantity. In order to establish a linear equation of lime dosage and related indexes under the condition of waterlogging fallow or dry fallow, calculations showed that each application of lime at 1 000 kg/hm2 or kg/hmss2 could improve soil pH value by 0.238 2 or 0.246 5units respectively, and reduce the effective Cd content to 0.007 5 mg/kg both in the arid fallow and the waterlogging fallow conditions. The lime theoretic application rate for the lowest Cd content of late rice in the arid fallow was 5 120 kg/hm2, and the minimum limit of the Cd content in rice was 0.124 2 mg/kg; and the lime theoretic application rate for the highest yield of late rice in the submerged water fallow was 4 636 kg/hm2, the minimum theoretic Cd content in rice is 0.100 7 mg/kg, and it could reduce the Cd content in rice under the condition of submerged fallow and decrease the dosage of lime.