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

作　　者：徐凡迪 杨玉春 陈燕旋 李聪 吴疆翀[1] 王同立 李帅锋[1] 苏建荣[1] XU Fan-di;YANG Yu-chun;CHEN Yan-xuan;LI Cong;WU Jiang-chong;WANG Tong-li;LI Shuai-feng;SU Jian-rong(Institute of Highland Forest Science,Chinese Academy of Forestry,Kunming 650224,Yunnan,China;Lincang Academy of Forestry,Lincang 677000,Yunnan,China;Faculty of Forestry,The University of British Columbia,Vancouver,BC Canada,V6T1Z4)

机构地区：[1]中国林业科学研究院高原林业研究所,云南昆明650224 [2]临沧市林业科学院,云南临沧677000 [3]不列颠哥伦比亚大学林学院,温哥华V6T1Z4

出　　处：《林业科学研究》2025年第1期190-199,共10页Forest Research

基　　金：云南省中青年学术与技术后备人才计划(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);科技基础性工作专项子课题(2021FY100803)资助。

摘　　要：[目的]通过分析南亚热带林地利用方式变化对土壤团聚体组成及化学计量特征的影响,为人工林土壤有机碳(SOC)固持及其养分循环提供科学依据。[方法]以云南省永德县大雪山季风常绿阔叶林、茶园、澳洲坚果林和核桃林为研究对象,测定土壤表层(0~20 cm)团聚体不同粒径的质量百分含量、SOC、全氮(TN)和全磷(TP)含量以及土壤碳氮比(C∶N)、碳磷比(C∶P)和氮磷比(N∶P)等化学计量特征在不同林地利用方式的变化趋势。[结果](1)土壤团聚体的质量百分含量随粒径增大而显著增加。天然林转换为核桃林和澳洲坚果林,粒径为>2 mm和1~2 mm的土壤团聚体质量百分含量显著增加,而粒径为0.5~1 mm、0.25~0.5mm和<0.25 mm的土壤团聚体则下降。(2)林地利用方式下土壤团聚体SOC、TN和TP含量随粒径减小呈增大趋势。天然林转换为核桃林和澳洲坚果林,显著降低了不同粒径土壤团聚体SOC和TN含量,而对茶园无显著影响;核桃林土壤团聚体不同粒径的TP含量要显著高于其他林地类型。(3)天然林转为核桃林和澳洲坚果林后土壤团聚体的C∶N、C∶P和N∶P显著降低,茶园无显著变化。(4)土壤速效氮和含水量促进土壤团聚体SOC、TN、TP的积累,提高化学计量特征,而SD的作用则相反。[结论]天然林转换为人工林后,澳洲坚果和核桃林SOC、TN、TP及其化学计量特征受影响最大,而茶园则无显著影响,小粒径的土壤团聚体能固定更多的SOC、TN和TP。[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 carbon(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 under different land-use types were analyzed.[Result](1)The mass percentage of soil aggregates significantly increased with increasing particle size.When primary forests were converted to walnut and macadamia 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 decreasing 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 plantations,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

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 

分 类 号：S152.4[农业科学—土壤学]