中国城市林业2025，Vol.23Issue(6)：9-16,8.DOI:10.12169/zgcsly.2025.06.08.0001
林分结构对北京城区森林土壤表层有机碳含量的显著影响
Pronounced Effects of Stand Structure on Topsoil Organic Carbon Content in Beijing's Urban Forests
摘要
Abstract
[Objective]The adjustments of forest structure and species composition influence soil organic carbon content,which has attracted increasing attention.However,the influence of urban forest structure on topsoil organic carbon at the local scale remains unclear.This study aims to elucidate the mechanisms through which urban forest structure affects soil organic carbon,thereby providing a basis for optimizing high-carbon-sink urban forest management.[Method]Sampled plots inventory is conducted along"米"shape transects within the sixth-ring road in Beijing,and 10 indicators related to stand physical structure and tree species composition are selected,along with corresponding soil samples.The physical structural complexity(PSC)and species composition complexity(SCC)of urban forest stand are constructed by using principal component analysis to analyze the effects of stand structural complexity on topsoil content of organic carbon.[Result]Single indicators of stand physical structure(P<0.001)and woody species composition(P<0.05)are significantly correlated with topsoil carbon content.The indicators related to stand physical structure(e.g.,tree height diversity,diameter at breast height diversity,mean diameter at breast height,mean tree height,stand basal area)explain 15.9%-29.9%of the variance in topsoil carbon content,and PSC explains 39.1%of the variance.Species compositional diversity and SCC have the maximal explanation of topsoil carbon content variation(6.8%).[Conclusion]Stand physical structure is the main biotic driver to the variation of topsoil carbon content in urban forests in Beijing,while species diversity only takes the auxiliary role.Lower woody species richness is one of the possible reasons for the weak explanation of species diversity on topsoil content of carbon.Therefore improving physical structural complexity is an important strategy to establish urban forests with high carbon sequestration efficiency.关键词
表层土壤有机碳/城市森林/林分结构复杂度/物种组成结构/林分物理结构Key words
topsoil organic carbon/urban forest/stand structural complexity/species composition structure/physical stand structure引用本文复制引用
李阳,Syed Mushtaq Hussain Shah,马冰倩,谢仁天,徐宇沛,郭嘉欣,肖倩,张新娜,徐程扬..林分结构对北京城区森林土壤表层有机碳含量的显著影响[J].中国城市林业,2025,23(6):9-16,8.基金项目
北京林业大学"5·5工程"科研创新团队项目(BLRC2023B06) （BLRC2023B06）
北京市朝阳区项目(CYSF-1904) （CYSF-1904）
