林业科学2026，Vol.62Issue(8)：86-96,11.DOI:10.11707/j.1001-7488.LYKX20260181
毛竹扩展过程中土壤碳组分变化特征及其对有机碳积累的影响
Changes in Soil Carbon Fractions during Moso Bamboo Expansion and Their Effects on Organic Carbon Accumulation
摘要
Abstract
[Objective]This study aims to investigate the variation patterns of soil organic carbon(SOC)and its physical,chemical,and microbial carbon fractions during moso bamboo(Phyllostachys edulis)expansion,and to clarify the effects of each carbon fraction on SOC accumulation.[Method]The proportion of basal area at breast height(BA%)of P.edulis was used to quantitatively characterize expansion intensity.A typical successional sequence formed by bamboo expansion into Chinese fir forests(Cunninghamia lanceolata),including pure C.lanceolata forest,mixed P.edulis-C.lanceolata forests at early,middle,and late expansion stages,and pure P.edulis forest was taken as the research object.Soil samples were collected from the 0-50 cm soil profile to study the characteristics of SOC and its physical,chemical,and microbial carbon fractions in different forest stands.Boosted regression tree model and multiple stepwise regression analysis were employed to quantify the relative effects of each carbon fraction on SOC accumulation.[Result]Mixed P.edulis-C.lanceolata forest at the middle expansion stage(MCF-M,35%<BA%≤65%)exhibited the strongest soil carbon sequestration capacity.In the top soil(0-20 cm),SOC content(17.66-38.65 g·kg-1)and physical and chemical carbon fractions were significantly higher in MCF-M than those of the other four forest stands(P<0.05).In the 20-50 cm soil layer,there were no differences in physical and chemical carbon fractions among forest stands except for mineral-associated organic carbon(P>0.05).Unlike the surface enrichment of physical and chemical carbon fractions,the microbial necromass carbon and fungal and bacterial components in MCF-M were significantly higher than those in other forest types in the 0-50 cm soil profile(P<0.05).The boosted regression tree model revealed that the three types of carbon fractions jointly explained 83.25%of SOC variation in the 0-20 cm layer,with the relative influence ranked as microbial carbon fractions(55.51%)>physical carbon fractions(35.42%)>chemical carbon fractions(9.07%).Multiple stepwise regression analysis showed that both microbial necromass carbon and mineral-associated organic carbon were significantly positively associated with SOC accumulation(P<0.001).[Conclusion]Collectively,MCF-M exhibits superior soil carbon sequestration capacity during P.edulis expansion.The synergistic variation of microbial necromass accumulation and mineral protection is closely associated with SOC accumulation.关键词
毛竹林/混交林/有机碳固存/微生物残体碳/矿物结合态有机碳Key words
moso bamboo forests/mixed forests/organic carbon sequestration/microbial necromass carbon/mineral-associated organic carbon分类
农业科技引用本文复制引用
陈宇轩,刘佳军,李姗,刘晓彤..毛竹扩展过程中土壤碳组分变化特征及其对有机碳积累的影响[J].林业科学,2026,62(8):86-96,11.基金项目
国际竹藤中心基本科研业务费专项资金项目(1632024025,1632024016) （1632024025,1632024016）
"十四五"国家重点研发计划项目课题(2023YFD2201201). （2023YFD2201201）
