土壤学报2024，Vol.61Issue(5)：1299-1309,11.DOI:10.11766/trxb202309150379
骨粉生物质炭对酸性土壤的改良作用
Alleviating Effects of Bone Meal Biochars on Acidic Soil
摘要
Abstract
[Objective]The purpose of this study was to explore the optimum preparation conditions of bone biochars,their improvement effects on acid soil,and the influence on Al forms from the perspective of soil solid phase and liquid phase.[Method]The anaerobic pyrolysis of pig,chicken,ox,and sheep bone meals were used as raw materials to produce biochars(bone biochars)as ameliorants and three typical acid soils were used.[Result]The results showed that the bone biochars prepared by high-temperature anaerobic pyrolysis were rich in CaO,CaCO3,and Ca5(PO4)3(OH),contained alkaline substances such as NaO and MgO and characterized by many functional groups including-OH.Nevertheless,the alkali content of bone biochar was greatly affected by the pyrolysis temperature.The alkali content was close to the peak value and remained stable at 800℃for chicken and cow bones,and the same at 900℃for pig and sheep bones.Interestingly,the alkali content of these bone biochars was about 90%of the quicklime,which is the best preparation temperature.Also,the biochars effectively increased the pH of acidic red soils from Anhui,Jiangxi,and Guangdong with an original pH of lower than 6.The alkaline substances in bone biochars mainly existed in the form of H+buffers and the magnitude of the increase in soil pH was inversely proportional to the initial soil pH.After adding 5 g·kg-1 pig,chicken,sheep,and ox bone biochars to the red soils with pH=4.40,the Al concentration in soil solution decreased by 33%,34%,47%,and 41%,respectively,compared with the control,and the content of organically bound Al in solid phase had no significant change(P>0.05).Bone biochars increased the cation exchange capacity of acidic soil and reduced the content of soil solution Al and exchange Al by promoting the conversion of active Al to adsorbed hydroxyl Al and more stable Al in the soil solid phase.[Conclusion]Bone biochars are rich in nutrients required for plant growth,has the dual characteristics of inorganic and organic amendments,and are high-quality materials that can replace traditional lime as soil amendments for acidic farmlands.关键词
动物骨炭/热解温度/酸性土壤/铝毒害/土壤铝形态Key words
Animal bone meal biochars/Pyrolysis temperature/Acid soil/Aluminum toxicity/Soil aluminum species分类
资源环境引用本文复制引用
赵文瑞,赵宽,孔群芳,张文娟,胡程凯,林雨欣,陶炳娇,王国鑫,彭可睿,王聪..骨粉生物质炭对酸性土壤的改良作用[J].土壤学报,2024,61(5):1299-1309,11.基金项目
安徽省高校自然科学研究项目(KJ2021A0654)和安徽省高校自然科学研究重点项目(2023AH050486)资助Supported by the Natural Science Research Project of Anhui Province University,China(No.KJ2021A0654)and the Natural Science Research Key Project of Anhui Province University,China(No.2023AH050486) （KJ2021A0654）
