土壤2023，Vol.55Issue(6)：1198-1206,9.DOI:10.13758/j.cnki.tr.2023.06.005
不同生物质炭对棕壤中磷素吸附解吸的影响
Effects of Different Biochars on Phosphorus Adsorption and Desorption in Brown Soil
摘要
Abstract
In this study,different biochars were prepared with rice straw,corn straw and peanut shell using the oxygen-limiting heating carbonization method and their influences on phosphorus(P)adsorption and desorption in brown soil were studied through batch adsorption experiment in order to reduce the loss of soil P and improve the utilization efficiency of P fertilizer.The results showed that rice straw biochar significantly improved P adsorption with an addition of 4 g/kg,while peanut shell and corn straw biochars significantly reduced P adsorption.The change trend of isothermal adsorption curves were similar under different biochars,all could be described well by Langmuir and Freundlich equations(R2>0.93),among them,Langmuir equation fitted better.P maximum theoretical adsorption caused by different treatments was as follows:rice straw biochar + brown soil>brown soil>peanut shell biochar + brown soil>corn straw biochar + brown soil.The adsorption kinetic experiments showed that the trend of P adsorption kinetic curve did not change under different biochars,among all kinetic models,the quasi-secondary kinetic model was the best suitable to describe P adsorption behavior(R2>0.99),followed by the quasi-first-order kinetic model(R2>0.99)and Elovich kinetic model(R2>0.88);The three kinds of biochars significantly promoted P desorption of brown soil,when biochar addition was≥2 g/kg,rice straw,corn straw and peanut shell biochars could improve P desorption rate by 50%,75%and 90%,respectively.In conclusion,different biochars can improve P supply and utilization of brown soil,and rice straw biochar has greater application value in reducing P loss of brown soil and protecting the ecological environment.关键词
棕壤/生物质炭/磷/吸附解吸Key words
Brown soil/Biochar/Phosphorus/Adsorption and desorption分类
农业科技引用本文复制引用
刘慧,张伟康,李蒋戈野,王青青,承睿,张少斌..不同生物质炭对棕壤中磷素吸附解吸的影响[J].土壤,2023,55(6):1198-1206,9.基金项目
国家自然科学基金项目(41671293)和沈阳农业大学大学生创新创业训练计划项目(2022167,2022265)资助. （41671293）
