北京林业大学学报2026，Vol.48Issue(5)：60-71,12.DOI:10.12171/j.1000-1522.20250380
杉木人工林阔叶化改造对土壤团聚体酶活性与化学计量比的影响
Effects of broad-leaved transformation of Chinese fir(Cunninghamia lanceolata)plantations on soil aggregate enzyme activities and stoichiometric ratios
摘要
Abstract
[Objective]This study aims to reveal the mechanism underlying the effects of soil aggregate size differentiation on enzyme activities and stoichiometric ratios under the background of broadleaved transformation of Chinese fir(Cunninghamia lanceolata)plantations.It provides scientific support for enhancing the productivity and sustainable management of subtropical plantations in China.[Method]Four stand types,including pure Chinese fir plantation(CL),pure Mytilaria laosensis plantation(PM),pure Castanopsis hystrix plantation(PC),and Mytilaria laosensis/Castanopsis hystrix mixed plantation(MP),were selected as research objects.Soil physicochemical properties,microbial biomass and activities of carbon(C),nitrogen(N)and phosphorus(P)cycling-related enzymes in bulk soil and different aggregate fractions at 0～10 cm soil layer were determined.The main driving factors for variations in soil enzyme activities and stoichiometric ratios after the conversion from Chinese fir plantations to native broadleaved forests were analyzed.[Result](1)Compared with CL,SOC in PM,PC and MP increased by 42.00%,85.25%and 136.53%,soil C∶P increased significantly by 30.80%,49.77%and 73.13%,MBN increased significantly by 25.98%,32.88%and 54.18%,and MBP increased significantly by 12.99%,28.31%and 49.62%,respectively.Activities of C-,N-,and P-cycling enzymes were significantly enhanced in bulk soil and all aggregate sizes,with the highest values in 0.25-1 mm and<0.25 mm fractions in MP.In particular,C-and N-cycling enzyme activities in MP were significantly higher than those in other stands.(2)The soil enzyme C∶N∶P was about 1∶1.06∶1.15,deviating from the global meta-analysis average of 1∶1∶1,indicating higher microbial enzyme activities for N and P acquisition than for C acquisition,and higher P-acquiring enzyme activity than N-acquiring enzyme activity.(3)Enzyme vector analysis showed that CL was P-limited(VA>45°),while PM,PC,and MP were N-limited(VA<45°).Vector length(VL)was greater than 1 in all stands but decreased after broadleaved transformation,indicating that C limitation was gradually alleviated.(4)SOC,total phosphorus,soil N∶P,soil C∶P and total nitrogen were the dominant factors affecting soil enzyme activities,while SOC,soil C∶N and MBC mainly controlled the variation of enzyme stoichiometric ratios.[Conclusion]Broad-leaved tree species(especially mixed forests)can effectively improve soil enzyme activities and promote soil nutrient cycling and quality.Nevertheless,N limitation still exists in the converted stands.Therefore,appropriate nitrogen application or introduction of nitrogen-fixing tree species is recommended to optimize nutrient supply and maintain high ecosystem productivity.关键词
杉木人工林/阔叶林改造/土壤团聚体/土壤酶活性/酶化学计量比/矢量分析/可持续经营Key words
Chinese fir plantation/broadleaved transformation/soil aggregates/soil enzyme activity/enzyme stoichiometric ratio/vector analysis/sustainable management分类
农业科技引用本文复制引用
覃佳佳,侯丹阳,李佳君,黄海梅,黄麒霏,罗舟宇,王庆灵,黄雪蔓,尤业明..杉木人工林阔叶化改造对土壤团聚体酶活性与化学计量比的影响[J].北京林业大学学报,2026,48(5):60-71,12.基金项目
国家自然科学基金项目(32560339、32171755),广西自然科学基金项目(2025GXNSFAA069288),崇左凭祥友谊关森林生态系统广西野外科学观测研究站科研能力建设项目(桂科AD 25069098). （32560339、32171755）
