林分起源和林龄结构对迪庆州云杉林生物量碳储量的影响

摘要

In order to explore the impacts of origin and age structure on biomass carbon stock and its distribution pattern of forest ecosystem,this study simulated the influence of stand age and origin on carbon stock and its distribution of spruce forest in Diqing Tibetan Autonomous Prefecture,Yunnan,by using the data of forest inventory for planning and designing,Carbon Budget Model of the Canadian Forest Sector(CBM-CFS3)model.The results showed that the biomass carbon stock and carbon density of spruce forest in Diqing were 11 678.01Gg C and 75.19Mg C/hm2,respectively.Both carbon stock(11 659.69Gg C) and carbon density(83.27Mg C/hm2)of natural forest were higher than that of planted forest.The mature forest had the largest carbon stock(5 315.67Gg C)and over-mature forest had the highest carbon density(115.20Mg C/hm2).Either the carbon stock or carbon density of young forest was the smallest.With the aging of spruce stand,biomass carbon density tended to increase linearly and both the proportion of stem and the coarse root increases gradually.This study showed that origin and age structure of stands were the key elements which affect the spruce biomass carbon stock in Diqing.Through promoting regeneration,afforestation and practicing other management strategies,a sustainable pattern of carbon sequestration could be maintained for the spruce forest.%为探究林分起源和林龄结构对森林生物量碳分配格局的影响,基于森林资源规划设计调查、实测数据和加拿大林业碳收支模型(CBM-CFS3),分析了迪庆州不同起源、龄组的云杉生物量碳储量及其分配格局.结果表明,迪庆州云杉碳储量和碳密度分别为11 678.01Gg C和75.19Mg C/hm2;起源结构中天然林生物量碳储量(11 659.69Gg C)和碳密度(83.27Mg C/hm2)远高于人工林;林龄结构中成熟林碳储量最高(5 315.67Gg C),过熟林碳密度最大(115.20Mg C/hm2),而幼龄林碳储量和碳密度均最小.随着林龄增加,云杉生物量碳密度逐渐增加,树干和粗根占生物量碳储量的比例逐渐增大.结果证明,林分起源和林龄是影响迪庆州云杉生物量碳储量及分配的重要因素.未来可通过人工促进更新和造林,调整云杉林龄结构,以保持云杉林可持续固碳.