近30 a陕西省森林植被碳储量及其动态变化

利用陕西省1987—2014年7次森林资源清查资料,采用IPCC算法,估算了陕西省近30 a来森林碳储量和碳密度的动态变化。结果表明:近30 a陕西省森林碳储量和碳汇量均得到了显著的增加,森林碳储量呈现"缓升—急速上升"趋势,由1987年的121 Tg增加到2014年的238 Tg,净增117 Tg,年均增长率2.3%。特别是21世纪以来,森林碳汇作用最强,森林净碳汇量为85 Tg,对森林总碳汇的贡献为72.65%;森林年均碳汇量与森林采伐量呈负相关,表现为采伐量越大,对应碳汇量越小;不同起源森林碳储量、碳密度和碳汇能力呈现天然林远远大于人工林的特征,天然林是陕西省碳储量及碳汇的主要贡献者;不同森林类型中栎类、硬阔类和软阔类是森林碳储量的主要贡献者;碳储量主要集中于面积比重较小的近熟林、成熟林和过熟林;碳密度与龄级呈正相关,表现为龄级越大碳密度越大。

Forest Carbon Storage and Its Dynamic Change in Shaanxi Province in Recent 30 Years

The IPCC method was used to estimate the dynamic change of the forest carbon storage and carbon density in Shaanxi Province in recent 30 years using the inventory data in seven periods from 1987 to 2014.The results showed that the forest carbon storage and carbon sink in Shaanxi Province were significantly increased in recent 30 years,and the forest carbon storage was increased from 121 million tons in 1987 to 238 million tons in 2014,the net increase was 117 million tons,and the average annual increase rate was 2.3％.Especially since the 21th century,the effect of forest carbon sink was the strongest,the net carbon sink amount was 85 million tons,and the contribution to total forest carbon sink was 72.65 ％.There was an inverse correlation between the annual forest carbon sink and the forestry harvest volume.Thehttp://dict.cnki.net/dict_result,aspx? searchword =％ e4％ b8％ 8d％ e5％90％ 8c％ e8％ b5％ b7％ e6％ ba％ 90&tjType =sentence&style =&t =different + original forest carbon storage,carbon density and carbon sink capacity of natural forest were much higher than those of artificial forest,and the natural forests were the main contributors to the carbon storage and carbon sink in Shaanxi Province.In different forest types,the quercus,hard broad-leaf species and soft broad-leaf species were the main contributors to the forest carbon storage.The carbon storage was mainly in the near-mature forest,mature forest and over-mature forest with low proportions.There was a positive correlation between the carbon density and the forest age.