Sugarcane straw biochar:effects of pyrolysis temperature on barite dissolution and Ba availability under flooded conditions  

作　　者：Douglas G.Viana Matheus B.Soares Luís Reynaldo F.Alleoni Fernando B.Egreja Filho Owen W.Duckworth Jussara Borges Regitano 

机构地区：[1]Department of Soil Science,Luiz de Queiroz College of Agriculture(ESALQ),University of São Paulo(USP),Piracicaba,SP,Brazil. [2]Department of Crop and Soil Sciences,North Carolina State University,Raleigh,NC,USA. [3]Department of Chemistry,Institute of Exact Sciences,Federal University of Minas Gerais,Belo Horizonte,MG,Brazil.

出　　处：《Biochar》2024年第1期1476-1488,共13页生物炭(英文)

基　　金：Fundação de Estudos Agrários Luiz de Queiroz(FEALQ),the São Paulo Research Foundation(FAPESP)(Grant Nos.2019/02796-3,2019/22280-1);the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil(CAPES),Finance Code 001 for the scholarship for this research.M.B.S gratefully thanks the FAPESP(Grant Nos.2019/06897-9,2020/13700-4);the Brazilian Council for Scientific and Technological Development-Conselho Nacional de Desenvolvimento Científico e Tecnológico(CNPq)for the scholarships(Grant Nos.140830/2018-9 and 311514/2023-5);O.W.D was supported by the USDA National Institute of Food and Agriculture,Hatch projects NC02713 and NC02951.

摘　　要：Reductive dissolution of barium(Ba)sulfate in wetland soils may increase Ba bioavailability in the environment,yet no information is available regarding Ba remediation using biochar.This study investigated the effectiveness of sugarcane(Saccharum officinarum)straw biochar pyrolyzed at 350℃(BC350),550℃(BC550),and 750℃(BC750)in inhibiting barite dissolution and,consequently,Ba availability in a soil artificially spiked with barite and flooded for 365 days.Increasing pyrolysis temperature alters the carbon structure,and increases dehydration and depolymerization,resulting in more stable biochar that releases less DOC(8.6-fold decrease from BC350 to BC750).Additionally,high-temperature biochar(BC750)had 1.7 times higher carbon(C)content,2.4 times higher ash content,and a 13.1 times greater specific surface area(SSA)than low-temperature biochar(BC350).Amending soil with BC750 increased pH but did not promote reducing conditions,and thus did not promote barite dissolution.Conversely,greater DOC in low-temperature biochar,particularly BC350,favored reducing conditions and increased barite dissolution by 23%,with BC550 also showing an 18%increase.This enhancement led to a greater pool of Ba sorbed into more labile exchangeable sites.In summary,pyrolysis temperature affects biochar attributes,which in turn influences the soil geochemical environment and Ba speciation.Low-temperature biochar(BC350)shows potential as an amendment to increase the bioavailable Ba pool in assisted remediation programs,such as biochar-assisted phytoremediation.

关 键 词：Anoxic soil WETLANDS Ba remediation Redox potential DRIFT 

分 类 号：S15[农业科学—土壤学]