四川农业大学学报2025，Vol.43Issue(4)：906-914,9.DOI:10.16036/j.issn.1000-2650.202504589
川西亚高山不同演替阶段天然林碳密度及分配特征
Carbons Density and Spatial Distribution of Natural Forests at Different Succession Stages in Subalpine Region of Southwestern China
摘要
Abstract
[Objective]The subalpine in western Sichuan,serving as an important carbon sink functional area and ecological barrier on the eastern Qinghai-Tibetan Plateau,demonstrate that their carbon density and allocation patterns across different successional stages play a critical scientific role in understanding regional carbon cycling mechanisms and enhancing carbon sequestration capacity.[Method]This study focused on Betula utilis forest(NBF),Abies fargesii var.faxoniana and Betula utilis mixed forests(FBM),and Abies fargesii var.faxoniana forest(OGF)in the Miyaluo forest region.Through stratified surveys(tree layer,shrub layer,herb layer,litter layer,and soil layer)combined with laboratory experi-ments and model-based calculations,we systematically quantified species-specific carbon content,eco-system biomass,and carbon density allocation patterns across different successional stages of these forests.[Result]① The carbon content of Abies fargesii var.faxoniana(504 g/kg)was significantly higher than that of Betula utilis(464 g/kg)and shrubs(mean of four shrub species:441 g/kg).With succession pro-gression,the carbon content of the tree layer,shrub layer,and litter layer exhibited a gradient pattern of OGF>FBM>NBF.② The aboveground biomass(246.45 t/hm²)and productivity[9.64 t/(hm²·a)]of OGF were significantly higher than those of NBF(aboveground biomass:129.94 t/hm²,productivity:[5.60 t/(hm²·a)]and FBM(aboveground biomass:101.71 t/hm²,productivity[7.56 t/(hm²·a)].③ The ecosystem carbon density of OGF(207.74 t/hm²)significantly exceeded that of NBF(137.04 t/hm²)and FBM(133.24 t/hm²).In OGF,carbon was predominantly stored in the tree layer,while in NBF and FBM ecosystems,soil served as the primary carbon pool.④ Overall,the carbon density within the tree layer followed the order:stem>branches>leaves.For the shrub layer,carbon density was higher in aboveg-round than belowground components.In litter layers,NBF and OGF exhibited a sequence of partially de-composed>undecomposed>fully decomposed,whereas FBM showed undecomposed>partially decom-posed>fully decomposed.[Conclusion]The results of this study elucidate the carbon density and alloca-tion patterns across three different successional stages in subalpine natural forests of western Sichuan,providing a scientific foundation for coordinating natural forest restoration with carbon neutrality objectives.关键词
生物量/碳含量/碳密度/碳分配/天然林Key words
biomass/carbon content/carbon density/carbon allocation/natural forest分类
农业科技引用本文复制引用
蔡蕾,陈淼,李旭华,徐峥静茹,冯秋红,刘兴良..川西亚高山不同演替阶段天然林碳密度及分配特征[J].四川农业大学学报,2025,43(4):906-914,9.基金项目
国家"十四五"重点研发计划(2024YFD2201402) （2024YFD2201402）
国家"十三五"重点研发计划(2017YFC0505004) （2017YFC0505004）
四川省林草科技创新团队项目(2024LCTD0109、CXTD2025003). （2024LCTD0109、CXTD2025003）
