湖南省杉木人工林生态系统碳储量分配格局及固碳潜力

The allocation pattern of carbon storage and carbon sequestration potential in Chinese fir plantation ecosystems in Hunan Province

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 allocation pattern of carbon storage in forest ecosystems significantly affects the terrestrial carbon budget,but such pattern is unclear in the Chinese fir plantations in Hunan Province. On the basis of the field investigation of sample plots in Hunan Province and the data of the Eighth National Forest Inventory,we calculated the carbon storage and density of Chinese fir plantation ecosystems in Hunan Province. The results showed that the carbon density of Chinese fir plantation ecosystems increased with the increasing stand age. The ecosystem carbon densities of young,middle-aged and mature plantations were 125.70,138.57 and 193.72 Mg·hm^（-2）,respectively. The vegetation carbon densities of young,middle-aged and mature plantations were18.72,38.86 and 62. 48 Mg · hm-2,respectively. The soil carbon densities of young,middleaged and mature plantations were 105.49,97.23 and 126.70 Mg·hm^（-2）,respectively. The total carbon storage of Chinese fir plantation ecosystem was 307.48 Tg,of which,the carbon storage in young,middle-aged and mature plantations was 90. 57,91. 87 and 125. 1 Tg,respectively. The carbon sequestration potential of Chinese fir plantation ecosystem was 85.56 Tg,of which the carbon sequestration potentials of vegetation and soil were 47.19 and 34.82 Tg,respectively. Quantifying the potential of plantation carbon sequestration can help evaluate the maximum carbon sequestration capacity and design sustainable forest management strategies for achieving its potential in mitigating climate change.