土壤学报2024，Vol.61Issue(5)：1284-1298,15.DOI:10.11766/trxb202305040171
贵州典型喀斯特流域土壤氧化铁特征分异及其影响因素
Distinguishing Features and Influential Factors of Soil Iron Oxide in a Representative Karst Watershed in Guizhou Province
摘要
Abstract
[Objective]Understanding the characteristics and differentiation of soil iron oxide in subtropical karst basins is crucial for comprehending the occurrence,development,and type evolution of soil in this unique regional complex.[Method]This study focused on 53 typical soil profiles in the Houzhai River Basin,Puding County,Guizhou Province.The research involved measuring the content of various forms of iron oxides in diagnostic surface and subsurface horizons,calculating their weathering indexes,and analyzing the characteristics and differentiation of soil iron oxides.Additionally,the study explored the impacts of soil-forming environments and soil attributes on the characteristic differentiation of iron oxides.[Result]The results revealed an increasing trend in the content of total iron and free iron from diagnostic surface to subsurface horizons,with average increments of 25.54%and 39.63%,respectively.Iron oxides exhibited enrichment in diagnostic subsurface horizons.The activation degree of iron in the diagnostic surface layer surpassed that in subsurface horizons,while free iron and the iron crystal gel rate showed an opposite trend.Most tested diagnostic tables'subsoil had over 30 g·kg-1 of free iron,over 50%iron dissociation degree,and less than 30%iron activation degree,indicating that the soil was in the aluminization stage during the middle phase of desilication.Factors such as parent rock,land use,watershed position,organic matter,pH,clay CEC7,and texture types significantly influenced the iron oxide content and weathering index of various soil forms.Geographical detector analysis highlighted the significant explanatory power of parent rock and organic matter on iron oxide index differences(excluding free iron degree),with the highest Q value observed in their interaction(total iron 41.9%,free iron 39.8%,amorphous iron 40.1%,iron activity 41%,iron crystal gel ratio 52.5%).[Conclusion]Apparently,parent rock and organic matter are the primary factors influencing the differentiation of soil iron oxide characteristics in subtropical karst watersheds.关键词
氧化铁/影响因素/亚热带喀斯特流域/贵州省Key words
Iron oxide/Influential factors/Subtropical karst watershed/Guizhou Province分类
农业科技引用本文复制引用
徐祖亮,陆晓辉,曾海莲,邹钰峰..贵州典型喀斯特流域土壤氧化铁特征分异及其影响因素[J].土壤学报,2024,61(5):1284-1298,15.基金项目
国家自然科学基金项目(41867001,41261058)、贵州师范大学学术新苗培养及创新探索专项项目(黔科合平台人才([2018]5769-23)和贵州师范大学博士科研项目(GZNUD[2017]7 号)资助 Supported by the Project of National Natural Science Foundation of China(Nos.41867001,41261058),and The Special Project of Training and Innovative Exploration of New Academic Seedlings in Guizhou Normal University(Talents of Guizhou Science and Technology Cooperation platform)(No.[2018]5769-23),and Doctoral Research Project of Guizhou Normal University(No.GZNUD[2017]7) （41867001,41261058）
