北京林业大学学报2026，Vol.48Issue(5)：37-48,12.DOI:10.12171/j.1000-1522.20250522
间伐对华北落叶松凋落物分解及养分释放的影响
Effects of thinning on litter decomposition and nutrient release in Larix gmelinii var.principis-rupprechtii forests
摘要
Abstract
[Objective]This paper explores the effects of different thinning intensities on decomposition rates and nutrient release dynamics of needle litter and fine roots in Larix gmelinii var.principis-rupprechtii plantations to provide a reference for sustainable plantation management.[Method]The study was carried out based on long-term permanent plots established in 2019 at Saihanba Mechanical Forest Farm,Hebei Province of northern China,totally 12 fixed monitoring plots(30 m×30 m each).These plots included a control(CK,no thinning),light thinning(LT,20%),moderate thinning(MT,39%),and heavy thinning(HT,60%).An in-situ decomposition experiment was carried out for one and a half years using the litterbag method starting in November 2023.Soil temperature and water content were monitored synchronously.The initial total carbon(C),total nitrogen(N),and total phosphorus(P)contents of the litter were measured,as well as mass residual rates and nutrient release dynamics during decomposition.The Olson exponential decay model was used to calculate decomposition rates,and key influencing factors were analyzed through the mixed-effects model and correlation analysis.[Result](1)Thinning treatments significantly increased soil temperature and water content at 5 cm depth,with the largest increase observed in HT.Meanwhile,LT significantly increased initial N and P contents of needles and fine root litter and decreased the initial C/N and C/P,thereby improving litter quality.(2)All thinning treatments promoted the needle litter decomposition,with decomposition rates following the order of LT>MT>HT>CK.In contrast,the response of fine root decomposition to thinning intensity was inconsistent.LT and MT significantly promoted fine root decomposition,while the decomposition rate under HT was lower than under CK.(3)The decomposition rate of needle litter was significantly positively correlated with soil temperature and initial N and P contents of litter itself,and significantly negatively correlated with initial C/N and C/P.The decomposition rate of fine roots was mainly significantly correlated with initial chemical properties of litter itself(N and P contents,C/N and C/P),with no significant correlation with soil temperature and water content during monitoring period.[Conclusion]LT and MT effectively promote the decomposition of needle litter and fine roots and nutrient cycling by improving soil microenvironment and litter quality.Although HT accelerates needle decomposition,it inhibits fine root decomposition.Litter decomposition is jointly driven by microenvironment and substrate quality,but the dominant factors vary.Overall,light to moderate thinning is appropriate management intensity for optimizing litter decomposition and nutrient return in L.gmelinii var.principis-rupprechtii plantations.关键词
华北落叶松/叶片凋落物/细根/分解速率/养分释放速率/间伐/人工林可持续经营Key words
Larix gmelinii var.principis-rupprechtii/needle litter/fine roots/decomposition rate/nutrient release rate/thinning/sustainable management of plantation分类
农业科技引用本文复制引用
杨璐,张海军,秦江环,和敬渊,王珊珊,彭逸飞,李世明,刘宪钊..间伐对华北落叶松凋落物分解及养分释放的影响[J].北京林业大学学报,2026,48(5):37-48,12.基金项目
公益性科研院所基本科研专项重点项目(CAFYBB2022ZB00105),国家自然科学基金项目(32501647). （CAFYBB2022ZB00105）
