文献类型：期刊文献

中文题名：落叶松云冷杉针叶混交林间伐后林木碳生长动态变化

英文题名：Dynamic Changes in Tree Carbon Growth after Thinning in a Mixed Forest of Larch-spruce-fir

作者：刘太艳[1] 罗光成[1] 卢军[2] 李晨[3] 朱怀远[4] 向玮[1]

第一作者：刘太艳

机构：[1]北京林业大学林学院,林木资源高效生产全国重点实验室,北京100083;[2]中国林业科学研究院资源信息研究所,北京100091;[3]汪清国有林管理分局,吉林延吉133200;[4]汪清林业分公司森调队,吉林延吉133200

年份：2025

卷号：38

期号：2

起止页码：12-22

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：;北大核心:【北大核心2023】；

基金：“十四五”国家重点研发计划(2022YFD2200502-04);国家自然科学基金(32160366)。

语种：中文

中文关键词：林分生长优势度;间伐;温带针叶混交林;异速生长期望;林分碳储量生长动态

外文关键词：stand growth dominance;thinning;temperate mixed forest;tree-level allometric expectation;dynamics of stand carbon growth

分类号：S757

摘要：[目的]旨在确定树种组或单木对林分碳储量增长的贡献,分析其随间伐强度和伐后时间的动态变化,从而为以提升森林碳汇为目标的经营采伐制定合理的伐除策略提供参考依据。[方法]以吉林省金沟岭林场16块落叶松云冷杉针叶混交林固定样地为研究对象,分别设置20%(轻度)、30%(中度)、40%(重度)和0%(对照)4个间伐强度进行定期调查,采用由大小对称竞争下树木碳储量生长作为异速生长期望的函数与林分生长优势度结合形成的分析框架,识别不同间伐强度下树木或树种群在采伐后对剩余林分碳汇的贡献,以及随伐后时间推移的动态变化。[结果]未间伐样地的生长优势度伴随林龄的增加呈上升趋势;林分生长优势度随间伐强度的增加而减小,随伐后时间的推移而增大,但轻度间伐林分生长优势度大于未间伐林;轻度间伐促进林分中大树更好地吸收地下资源,而中度和重度间伐则使林分下层小树接收更多光照,因此轻度间伐促进了林分中大树的碳增长,中度和重度间伐促进林分中小树的碳增长;随着间伐强度的增加,林下不耐荫树种的生长逐渐超过其异速生长预期,落叶松对林分碳汇的贡献大于其他耐荫性伴生树种,尤其是大中型落叶松。[结论]自下而上的间伐重新分配了剩余树木中的可利用资源,使原本处于竞争劣势的树木获得更快生长的机会。本研究采用的分析框架能够确定间伐后不耐荫落叶松是林分碳汇的强贡献者,而耐荫针叶或阔叶树种是林分碳汇的弱贡献者。这些信息有助于确定在采伐过程中优先清除的树木,并为未来林分组成的演替途径提供指导。在该研究区,伐除林分中的弱贡献者不仅可以提升林分的碳汇,还可以通过中高强度的间伐促使以落叶松为主的森林转变成云冷杉针叶混交林。
[Objective]This study aims to determine the contribution of tree species groups or individual trees to the growth of forest carbon storage and to analyze their dynamic changes in response to thinning intensity and post-harvest recovery periods.The goal is to provide scientific guidelines for developing rational thinning strategies to enhance forest carbon sequestration.[Methods]Sixteen fixed plots of larchspruce-fir mixed coniferous forests located in Jingouling Forest Farm,Jilin Province,were selected for this study.Periodic surveys were carried out on these plots,which underwent thinning at four different intensities(TI):light(20%BA removed),moderate(30%),heavy(40%)and a control(0%).An analytical framework combining growth dominance and an asymmetric competition-based model of tree carbon storage growth was applied.This analytical framework assessed the contributions of different tree species groups or individual trees to the carbon sequestration of the remaining stand under varying thinning intensities and evaluated their dynamic changes over time.[Results]Growth dominance in unthinned plots increased with stand age.However,in thinned plots,growth dominance decreased with increasing thinning intensity but gradually recovered over time post-thinning.Light thinning enhanced the ability of larger trees to absorb belowground resources,while moderate and heavy thinning increased light availability,benefiting understory saplings and promoting their carbon growth.Moreover,with greater thinning intensity,the carbon growth of shade-intolerant species in the understory exceeded their allometric growth expectations.Among these,Larix species contributed more to stand carbon sequestration than shade-tolerant associated species,particularly medium to large Larix trees.[Conclusion]Bottom-up thinning redistributed resources among remaining trees,allowing previously suppressed trees to achieve faster growth.The analytical framework employed in this study identified shade-intolerant Larix as strong contributors to stand carbon sequestration post-thinning,whereas shade-tolerant conifers or broadleaf species were weaker contributors.These findings provide valuable insights into tree prioritization during thinning and suggest potential pathways for forest succession.In the study,removing weaker contributors not only enhances stand carbon sequestration but also facilitates the transition from a Larix-dominated forest to a mixed Picea-Abies coniferous forest under moderate to high-intensity thinning regimes.