论文部分内容阅读
人工林生态系统碳储量的空间分配格局对全球陆地碳循环有重要的影响,但湖南省杉木人工林生态系统碳储量的分配格局并不清楚。本研究在湖南省样地野外调查的基础上,结合第八次全国森林资源清查的结果,计算出湖南省杉木人工林生态系统的碳储量空间分布格局。结果表明:杉木人工林生态系统碳密度随着林龄增加而增加,幼龄林、中龄林和成熟林分别为125.70、138.57、193.72 Mg·hm~(-2);其中,幼龄林、中龄林和成熟林的植被生物量碳密度分别为18.72、38.86、62.48 Mg·hm~(-2);土壤碳密度随着林分发育先降低后增加,幼龄林为105.49 Mg·hm~(-2)、中龄林为97.23 Mg·hm~(-2)、成熟林126.7 Mg·hm~(-2);湖南省杉木人工林生态系统碳储量为307.48 Tg,其中幼龄林为90.57 Tg,中龄林为91.87 Tg,成熟林为125.31 Tg;湖南省杉木人工林生态系统的固碳潜力为85.56 Tg,其中,植被固碳潜力为47.19 Tg,土壤的固碳潜力为34.82 Tg。确定杉木人工林固碳潜力有助于量化人工林对碳汇的贡献及其制定实现潜力的森林经营管理措施。
The spatial distribution pattern of plantation ecosystem carbon storage has an important impact on the global terrestrial carbon cycle, but the distribution pattern of carbon storage in the Chinese fir plantation ecosystem in Hunan is not clear. Based on the field survey of the sample plots in Hunan Province and the results of the Eighth National Inventory of Forest Resources, this study calculated the spatial distribution pattern of carbon storage in the ecosystem of Chinese fir plantations in Hunan Province. The results showed that the carbon density of Cunninghamia lanceolata plantation ecosystems increased with the increasing of age, and the young, middle-aged and mature forests were 125.70, 138.57 and 193.72 Mg · hm -2, respectively. Among them, The biomass carbon density of the middle-aged and mature forests was 18.72, 38.86 and 62.48 Mg · hm -2, respectively. The soil carbon density increased first and then decreased with the development of the forest, and the young forest was 105.49 Mg · hm ~ (-2). The middle-aged forest was 97.23 Mg · hm -2 and the mature forest was 126.7 Mg · hm -2. The ecosystem carbon storage of Chinese fir plantation in Hunan Province was 307.48 Tg, of which the young plantation was 90.57 Tg, the middle-aged forest was 91.87 Tg and the mature forest was 125.31 Tg. The carbon sequestration potential of Chinese fir plantation ecosystem in Hunan Province was 85.56 Tg, in which the vegetation carbon sequestration potential was 47.19 Tg and the soil carbon sequestration potential was 34.82 Tg. Determining the carbon sequestration potential of Cunninghamia lanceolata plantations is helpful to quantify the contribution of plantations to carbon sinks and to formulating forest management measures to realize their potential.