农业环境科学学报2017，Vol.36Issue(12)：2445-2452,8.DOI:10.11654/jaes.2017-0964
玉米秸秆炭对红壤镉吸附及养分含量、赋存形态的影响
Effects of corn-straw biochar on cadmium adsorption, nutrient contents, and chemical forms in red soil
摘要
Abstract
To better understand the effects of corn-straw biochar on soil cadmium(Cd)adsorption, and chemical forms of nitrogen(N)and phosphorus(P)and their transformation in soil, we performed an incubation experiment with the addition of different biochar levels. Red soil samples were mixed with corn-straw biochar, at a ratio of 0％, 2％, 4％, and 8％soil weight. These mixtures were cultivated in an incubator for 35 days. We explored the effects and mechanisms of biochar addition on soil Cd2+adsorption, and the bioavailability and chemical forms of nutrient elements[N, P, and potassium(K)] in red soil using isothermal adsorption and chemical extraction methods. Results showed that biochar addition increased the soil pH and organic matter content, and enhanced the Cd2+adsorption capacities in soil. These adsorption behaviors were well fitted with both Freundlich and Langmuir equations(R2>0.90). The results of SEM-EDAX indicated that the biochar had adsorbed some Cd2+in the studied soil. Owing to soil pH changes by biochar addition, we explored the role of different pH values on red soil Cd2+adsorption behavior. At pH 4～8, Cd2+adsorption by red soil was enhanced with increasing pH. Zeta potential results of soil suspen-sion showed that biochar application could increase the amount of negative charge in soil, thus proving that more Cd2+would be adsorbed in red soil through the electrostatic effect. In addition, the chemical forms of the nutrient elements varied in response to biochar application in red soil. Specifically, the bioavailable forms of P(KCl-P), N(IEF-N), and K in red soil significantly increased with biochar addition.The P forms(Ca-P, Fe-P)were also enhanced by biochar addition, but no significant changes in total transferable N(TTN)content was observed. Based on the above results, we concluded that corn-straw biochar application could decrease the environmental risk of heavy metal contaminated soil, and significantly improve the quality of soil fertility.关键词
红壤/玉米秸秆炭/镉/养分元素/等温吸附Key words
red soil/corn-straw biochar/cadmium/nutrient elements/isothermal adsorption分类
资源环境引用本文复制引用
汪宜敏,唐豆豆,张晓辉,袁旭音,徐兰..玉米秸秆炭对红壤镉吸附及养分含量、赋存形态的影响[J].农业环境科学学报,2017,36(12):2445-2452,8.基金项目
中央高校基本科研业务费专项资金(2015B12314) （2015B12314）
江苏省自然科学基金(BK20160859) （BK20160859）
国家自然科学基金(41601540) （41601540）
国家重点研发计划专项(2017YFD0800302) The Fundamental Research for the Central Universities(2015B12314) （2017YFD0800302）
The Foundation Research Project of Jiangsu Province (BK20160859) （BK20160859）
The National Natural Science Foundation of China(41601540) （41601540）
The National Key Research and Development Program of China (2017YFD0800302) （2017YFD0800302）
