生态与农村环境学报2016，Vol.32Issue(4)：651-658,8.DOI:10.11934/j.issn.1673-4831.2016.04.021
牛粪配合无机改良剂对稻田土壤Cd赋存形态及生物有效性的影响
Effects of Decomposed Cattle Dung Coupled With Inorganic Soil Ameliorants on Speciation and Bioavailability of Cadmium in Paddy Soil
摘要
Abstract
To investigate effects of application of organic and inorganic soil ameliorants in combination on speciation and bioavailability of cadmium and uptake or accumulation of cadmium by rice growing in cadmium contaminated paddy soil, a field experiment was carried out in a tract of Cd⁃contaminated paddy field in Tianyuan Town, Jinyang District, Deyang Cit⁃y, Sichuan Province of China. The experiment was designed to have four treatments, i.e. Treatment D (decomposed cattle dung only) , Treatment DS ( decomposed cattle dung plus sepiolite) , Treatment DL ( decomposed cattle dung plus lime⁃stone) and Treatment DP ( decomposed cattle dung plus calcium⁃magnesium⁃phosphate fertilizer) . Results show that cad⁃mium concentration in brown rice of Treatments DS, DL and DP was 50% to 70% lower than that of Treatment D in the rice⁃wheat rotation system and even lower than the criteria set in the “Limits for Contaminants in Food” ( GB 2762-2012) . However, Treatment DP promoted Cd accumulation in stem, which may increase the risk of cadmium contamina⁃tion of the winter crop by incorporation of rice straw. Meanwhile, Treatments DS, DL and DP lowered the content of ex⁃changeable cadmiumin the soil at the tillering and maturing stages of rice. The drop reached by 42% and 44% in Treat⁃ments DL and DP in the rice⁃rapeseed rotation system and by 48% and 53% in the rice⁃wheat rotation system, respective⁃ly. Moreover, Treatments DS, DL and DP increased the contents of organic carbon and soluble organic carbon in the soil. Furthermore, Treatment DL significantly increased soil pH. The decline of soil exchangeable Cd at the maturing stage of rice was found to be the major factor lowering the accumulation of Cd in brown rice. Treatments DS, DL and DP raised the content of soluble organic carbon in the soil, thus decreasing the content of active Cd in the soil, and hence reducing the risk of soil cadmium entering the food chain through bio⁃accumulation. To sum up, Treatments DS and DL can be deemed as the optimum option of agronomic control technique for safe rice production.关键词
Cd/改良剂/生物有效性/水稻/赋存形态/土壤Key words
cadmium/ameliorant/bioavailability/rice/speciation/soil分类
资源环境引用本文复制引用
杨兰,李冰,王昌全,郭勇,肖瑞,张庆沛,郑顺强..牛粪配合无机改良剂对稻田土壤Cd赋存形态及生物有效性的影响[J].生态与农村环境学报,2016,32(4):651-658,8.基金项目
国家科技支撑计划（2013BAD07B13）；四川省科技支撑计划 （）
