林业科学研究2025，Vol.38Issue(1)：190-199,10.DOI:10.12403/j.1001-1498.20240026
南亚热带林地利用方式对土壤团聚体组成及碳、氮和磷化学计量的影响
Effects of Woodland Use on Soil Aggregate Composition and C,N and P Stoichiometric Characteristics in a Southern Subtropical Region
摘要
Abstract
[Objective]To analyze the impact of land-use changes in the southern subtropical forests on soil aggregate composition and stoichiometric characteristics,providing scientific evidence for soil organic car-bon(SOC)sequestration and nutrient cycling in plantations.[Method]Monsoonal evergreen broad-leaved forest,tea garden,macadamia plantation,and walnut plantation were selected for our aim in Yongde Snow Mountain,southwest Yunnan,China.Soil samples from the top layer(0-20 cm)were collected,and the mass percentage of aggregates of different sizes,as well as SOC,total nitrogen(TN),total phosphorus(TP),and stoichiometric ratios such as carbon to nitrogen ratio(C:N),carbon to phosphorus ratio(C:P),and nitrogen to phosphorus ratio(N:P)were measured.The trends in changes of these characteristics un-der different land-use types were analyzed.[Result](1)The mass percentage of soil aggregates signific-antly increased with increasing particle size.When primary forests were converted to walnut and macad-amia plantations,the mass percentage of aggregates with particle sizes>2 mm and 1-2 mm significantly increased,while the mass percentage of aggregates with particle sizes 0.5-1 mm,0.25-0.5 mm,and<0.25 mm decreased.(2)The contents of SOC,TN,and TP content of soil aggregates increased with de-creasing particle sizes across different woodland use types.The conversion of primary forests to walnut and macadamia plantations significantly reduced the SOC and TN content in aggregates of all particle sizes,while no significant impact was observed on the tea garden.The TP content in soil aggregates of walnut forests was significantly higher than in other forest types.(3)The C:N,C:P,and N:P ratios of soil aggregates decreased significantly after the conversion of primary forests to walnut and macadamia plant-ations,while no significant changes were observed in tea garden.(4)Soil available nitrogen and water content promoted the accumulation of SOC,TN,and TP in soil aggregates,enhancing the stoichiometric characteristics,while soil bulk density had the opposite effect.[Conclusion]After the conversion of primary forests to plantations,the particle size composition,SOC,TN,TP,and stoichiometric characteristics of soil aggregates in macadamia and walnut plantations had significant effect,while tea garden had no signific-ant effect.Small-sized soil aggregates are able to retain more SOC,TN,and TP.关键词
常绿阔叶林/茶园/澳洲坚果林/核桃林/质量百分含量/冗余分析Key words
evergreen broad-leaved forest/tea garden/macadamia plantation/walnut plantation/mass percentage/redundancy analysis分类
农业科技引用本文复制引用
徐凡迪,杨玉春,陈燕旋,李聪,吴疆翀,王同立,李帅锋,苏建荣..南亚热带林地利用方式对土壤团聚体组成及碳、氮和磷化学计量的影响[J].林业科学研究,2025,38(1):190-199,10.基金项目
云南省中青年学术与技术后备人才计划(202105AC160036) （202105AC160036）
中央级公益性科研院所基本科研业务费专项资金(CAFYBB2020ZA002和CAFYBB2021ZA002) （CAFYBB2020ZA002和CAFYBB2021ZA002）
科技基础性工作专项子课题(2021FY100803)资助 （2021FY100803）
