外源有机酸协同生物炭对土壤微量元素的影响  

Effects of Exogenous Organic Acids Synergistic Biochar on Soil Microelement

作　　者：徐秋月 王小治[2] XU Qiuyue;WANG Xiaozhi(Party School of Dingyuan County CPC Committee,Chuzhou,Anhui 233200,China;School of Environmental Science and Engineering,Yangzhou University,Yangzhou,Jiangsu 225000,China)

机构地区：[1]中共定远县委党校,安徽滁州233200 [2]扬州大学环境科学与工程学院,江苏扬州225000

出　　处：《西昌学院学报（自然科学版）》2023年第3期77-81,共5页Journal of Xichang University(Natural Science Edition)

摘　　要：为未来改善生物炭和有机酸共存的土壤营养状况提供参考依据,有必要探究生物炭和有机酸共存对土壤中微量元素的影响。以玉米秸秆为原材料制备生物炭,采集不同深度的黄棕壤,选择柠檬酸和苹果酸这2种酸进行试验,除对照外共设置8个不同处理方式,分别是不施加或施加生物炭的表土加柠檬酸处理、不施加或施加生物炭的表土加苹果酸处理、不施加或施加生物炭的底土加柠檬酸处理和不施加或施加生物炭的底土加苹果酸处理。结果表明:(1)与对照组相比,施加2种有机酸增加了土壤中的铁和锰的溶出,且柠檬酸处理的土壤溶液中的铁和锰含量高于苹果酸处理;(2)由于底土和表土存在理化性质的差异,影响了铁和锰的溶出量,底土溶液锰的溶出量高达0.34 mmol/L,而表土溶液铁的溶出量高达0.7 mmol/L;3)2%的生物炭没有完全阻碍两种有机酸对微量元素的溶出。结论:有机酸可以活化土壤中的铁和锰,其活化效果与有机酸种类、浓度、金属、土壤酸碱度有关,且生物炭的施加对阻碍有机酸活化土壤中微量元素的能力有限。This paper aims to explore the effect of coexistence of biochar and organic acids on soil microelement,and to provide a reference for improving the soil nutrition with the coexistence of biochar and organic acid in the future.Biochar was prepared from corn stalks,yellow-brown soils at different depths were collected,citric acid and malic acid were se⁃lected for experiment,and a total of 8 different treatments were set up,including the topsoil without or with the applica⁃tion of biochar plus citric acid treatment,the topsoil without or with the application of biochar plus malic acid treatment,the subsoil without or with the application of biochar plus citric acid treatment,and the subsoil without or with the applica⁃tion of biochar plus malic acid treatment.The results showed that:(1)Compared with the control group,the application of two organic acids increased the dissolution of Fe and Mn in soil,and the Fe and Mn content in citric acid treated soil so⁃lution was higher than that in malic acid treatment.(2)Due to the difference in the physical and chemical properties be⁃tween the subsoil and the topsoil,the dissolution of Fe and Mn was affected,and the dissolution of Mn in the subsoil solu⁃tion was higher,up to 0.34 mmol/L,while the dissolution of Fe in the topsoil solution was higher,up to 0.7 mmol/L;3)2%of biochar did not completely inhibit the dissolution of microelements by two organic acids.The conclusions indicate that organic acids can activate Fe and Mn in soil,and their activation effects are related to the type and concentration of organic acids metals and pH of soil.The application of biochar has limited ability to inhibit the activation of microele⁃ment in soil by organic acids.

关 键 词：有机酸 柠檬酸 苹果酸 生物炭 微量元素 

分 类 号：S153.6[农业科学—土壤学]