【摘要】 研究了湖南鹰嘴界自然保护区内马尾松(Pinus massoniana)林、马尾松阔叶树混交林和常绿阔叶林这3种处于不同演替阶段森林类型的碳储量及时空分布格局。结果表明:3种类型森林生态系统碳储量分别为182.86、179.84和229.12MgC·hm-2,其中乔木层占59.57%～67.88%,随森林进展演替增加,乔木层是生态系统碳储量主要贡献者,且各林分均以树干占乔木层碳储量比例最大;土壤层占31.05%～36.55%,碳储量随演替进展而增加,但对森林生态系统碳储量贡献率减小;林下植被和凋落物层分别占0.41%～3.04%和0.65%～2.53%,均随演替进展而减少,对生态系统碳储量贡献微弱;演替过程中生物量碳与土壤碳储量比为1.96、1.69和2.20,生物量碳在生态系统碳储量中所占比例呈增加趋势。可见在常绿阔叶林分布区,实施近自然林经营,模拟常绿阔叶林结构,是提升该区域森林碳汇能力的重要途径。更多还原

【Abstract】 This paper studied the carbon(C) storage and its distribution pattern of Pinus massoniana forest,mixed P.massoniana-broad-leaved forest,and evergreen broad-leaved forest representing three different succession stages of evergreen broad-leaved forests in Yingzuijie National Nature Reserve in Hunan Province.The C storage of the three forest ecosystems was 182.86,179.84 and 229.12 Mg C·hm-2,respectively.With the largest share in trunk,the carbon stored in tree layers was the main contributor to the C storage,accounting for 59.57%-67.88%,and had an increasing trend with forest succession.The carbon sequestered in soil accounted for 31.05%-36.55%,which also increased with forest succession but had a decreasing proportion with the succession.The carbon storage of understory vegetation and litters had the least share,accounting for 0.41%-3.04% and 0.65%-2.53%,respectively,and decreased with forest succession.The ratio of biomass C to soil C storage of the three forest ecosystems was 1.96,1.69,and 2.20,respectively,and biomass C played a more and more important role in forest C sequestration during the succession from P.massoniana forest to evergreen broad-leaved forest.It was suggested that to implement near-nature forest management or simulate evergreen broad-leaved forest structure would be the main approach in promoting the carbon sequestering capacity of forest ecosystems in this region.更多还原