摘要
【目的】确定气候、土壤、地形、植被多样性和林分因子对兴安落叶松林碳密度变化的影响。【方法】基于大兴安岭兴安落叶松林野外调查数据,利用AMOS软件构建兴安落叶松林碳密度与影响因子间的结构方程模型,确定影响兴安落叶松林碳密度变化的主要影响因子;基于主成分和相关分析,建立主要影响因子与林分碳密度变化的关系。【结果】林分因子和植被多样性对乔木、灌木层的碳密度变化为正影响,气候、土壤和地形对乔木、灌木层的碳密度变化为负影响;除植被多样性对草本层的碳密度为正影响外,其余的影响因子均对草本层的碳密度为负影响。气候对兴安落叶松林碳密度变化的影响最大,其对乔木、灌木和草本层的碳密度的总影响系数分别是-0.814、-0.386、-0.486,直接影响系数分别是-0.77、-0.48、-0.43,间接影响系数分别是-0.044、0.091、-0.056。根据气候与兴安落叶松林碳密度的量化关系,得出林分碳密度随气候变量的增加而减少。【结论】兴安落叶松林碳密度变化主要受到气候变量的制约,而林分因子对林分碳密度变化影响最小。今后在研究林分碳密度变化时,要考虑气候因素的影响。在应对未来气候变化背景下,深入理解森林植被碳密度的动态变化及其与气候变化之间的耦合作用有着重要的指导意义。
【Objective】This study aimed to determine the effects of climate,soil,vegetation diversity,topography and forest stand factors on the carbon(C)density changes of Larix gmelinii forests.【Method】Based on field survey data of Larix gmelinii forests in the Greater Khingan Mountains,the structural equation model between carbon density of Larix gmelinii and influencing factors was employed by the AMOS software to determine the main influencing factor for C density changes of Larix gmelinii forests.The relationship between the main influencing factor and the change of C density was also established by using principal component analysis and correlation analysis.【Result】The results showed that stand factors and vegetation diversity had a positive effect on C density in trees and shrubs of Larix gmelinii forests.However,climate,soil and topography had a negative effect on the changes of the C density in trees and shrubs of Larix gmelinii forests.Vegetation diversity had a positive effect on the C density in herbs of Larix gmelinii forests,while all other influencing factors showed a negative effect on that.Among those factors,the climate had the greatest influence on C density changes of each layer.The total influence coefficients of C density in trees,shrubs and herbs were-0.814,-0.386 and-0.486 respectively,and the direct influence coefficients were-0.77,-0.48 and-0.43,while the indirect influence coefficients were-0.044,0.091 and-0.056,respectively.Based on the quantitative relationship between climate variables and forest carbon density,the change of forest C density decreased with the increase of climate variables.【Conclusion】C density changes of Larix gmelinii forests are mainly controlled by climate variables,while forest stand factors have little influence.In the future,the influence of climate factors should be considered when studying the change of forest C density.In the context of future climate change,it is of great significance to understand the dynamic change of forest vegetation C density and its coupling with climate change.
作者
乌雅瀚
铁牛
刘洋
Wuyahan;TIE Niu;LIU Yang(College of Forestry,Inner Mongolia Agricultural University,Hohhot 010019,Inner Mongolia,China;Inner Mongolia Academy of Forestry Sciences,Hohhot 010010,Inner Mongolia,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2022年第5期133-142,共10页
Journal of Central South University of Forestry & Technology
基金
内蒙古自治区科技计划项目(2020GG0067)。
关键词
兴安落叶松
碳密度
结构方程模型
主成分分析
Larix gmelinii
carbon density
structural equation model
principal component analysis
