西北林学院学报2026，Vol.41Issue(2)：103-111,9.DOI:10.3969/j.issn.1001-7461.2026.02.12
香椿中龄林间伐对林分生长和土壤酶活性及其化学计量比的影响
Effects of Thinning on Soil Enzyme Activity and Stoichiometric Ratios in Middle-Aged Toona sinensis Plantations
摘要
Abstract
To analyze post-thinning soil nutrient demand dynamics and propose scientific thinning and man-agement strategies for middle-aged Toona sinensis plantations,this study investigated a 7-year-old planta-tion(density:1 419 stems/hm2)in Pengshan District,Meishan City,Sichuan Province.Three thinning in-tensities(1/4,1/3,and 1/2)were implemented with unthinned stands as control.Five years post-thinning(12-year-old stands),we analyzed stand growth,soil chemical nutrients,enzyme activities,and their stoi-chiometric ratios.Key findings include:1)Thinned stands exhibited significantly greater growth than con-trols,with 1/2 intensity stands showing 1.17 times larger mean DBH and 1.40 times higher individual vol-ume compared to controls.2)Soil C,N,P,and K concentrations were lower in the 1/3 thinning treatment but partially recovered under the 1/2 thinning intensity.3)Correlation analyses revealed significant posi-tive relationships between β-glucosidase(βG),β-glucuronidase(βLU),and N-acetyl-β-D-glucosaminidase(NAG)activities and their substrate(soil organic carbon,SOC).Conversely,leucine aminopeptidase(LAP)and acid phosphatase(ACP)activities showed negative correlations with their target nutrients(N and P,respectively).4)Redundancy analysis(RDA)identified SOC,total nitrogen(TN),alkali-hydrolyza-ble nitrogen(AN),and total phosphorus(TP)as key factors influencing soil enzyme activities.5)Enzyme stoichiometry indicated N limitation in soil microbial communities across all stands and the 1/2 thinning in-tensity alleviated microbial C and N limitations.In conclusion,thinning enhanced stand growth in middle-aged T.sinensis plantations,with high-intensity thinning(1/2 intensity,retained density:825 trees/hm2)particularly suitable for large-diameter timber cultivation and sustainable forest management through miti-gation of soil microbial nutrient limitations.关键词
香椿/间伐/土壤养分/土壤酶活性/化学计量比Key words
Toona sinensis/thinning/soil nutrient/soil enzyme activity/stoichiometric ratio分类
农业科技引用本文复制引用
李金武,余冰,刘闵豪,肖兴翠,杨滨豪,辜云杰,彭建..香椿中龄林间伐对林分生长和土壤酶活性及其化学计量比的影响[J].西北林学院学报,2026,41(2):103-111,9.基金项目
四川省林草科技创新团队项目专题"大花序桉耐寒种质评价与香椿近熟林培育技术研究"(CXTD2025002) （CXTD2025002）
四川省科技计划项目子专题"香椿、红椿突破性新品种选育与配套技术研究"(2021YFYZ0032) （2021YFYZ0032）
世界银行贷款长江流域上游森林生态系统恢复项目科技成果推广或科研课题研究项目"珍贵用材树种良种繁育与造林关键技术研究与示范"(2019-510000-02-01-400761). （2019-510000-02-01-400761）
