Analysis on the dynamic changes of forest carbon stocks and sinks enhancement strategies in key state-owned forest regions:a case study on Longjiang Forest Group
[Objective]Key state-owned forest regions are the ballast for China to achieve its carbon neutrality goal,to study the dynamic changes of carbon sinks enhancement and enhancement strategies of key state-owned forest regions.[Method]Using the forest biomass expansion factor method,the forest carbon stock and carbon density of the Longjiang Forest Group and its 23 forestry bureaus and 7 directly affiliated forest farms were estimated based on forest management inventory data and archives and relevant literature at two points in 2002 and 2020,and the potential of carbon sequestration was estimated by the biomass-age model and maximum carbon density,so as to the dynamics of forest carbon sinks and its improvement strategy were analyzed.[Result]From 2002 to 2020,(1)Carbon stocks enhancement in key state-owned forest regions,the carbon stock of forest vegetation in Longjiang Forest Group increased from 189.23 TgC to 333.43 TgC,an increase of 71.22%;(2)Carbon sequestration in forest vegetation is mainly in the type of tree forests,and the proportion of carbon stock in tree forests has increased,the proportion of carbon stock in arborvitae forests increased from 91.97%to 99.77%of Longjiang Forest Group,Zhanhe Forestry Bureau had the highest carbon stock,Suiyang Forestry Bureau had the largest increase in carbon stock,Fenglin Forestry Bureau had the highest carbon density,and Muling Forestry Bureau had the largest increase in carbon density;(3)Longjiang Forest Group is dominated by mixed forests,and the largest proportion of carbon stocks is broadleaf mixed forests,and the largest proportion of tree species in pure forests are Quercus and Larix forests;(4)The vast majority of tree species have a net increase in carbon stocks,and the carbon density of each species shows a significant increasing trend,and the carbon densities of different species in 2020 range from 36.94 to 70.61 MgC/hm2,Quercus forests were the highest carbon-density forest type,and Larix forests were the highest carbon-density incremental forest type;(5)From the viewpoint of each forest age group,the middle-aged forests have the largest proportion of carbon stocks,carbon density and forest age are positively proportional to each other;(6)Through the prediction analysis,the carbon stocks of Longjiang Forest Group will reach 396.33 TgC in 2030 and 519.16 TgC in 2060;the carbon density of tree forests will increase from 59.64 MgC/hm2 in 2020 to 73.11 MgC/hm2 in 2030 and 95.76 MgC/hm2 in 2060,respectively,and the incremental increase will show a weakening trend.[Conclusion]To further increase forest carbon sequestration,forest ecosystem protection,restoration,and sustainable management should be strengthened,due to the limited potential of afforestation to expand carbon,the focus should be on carrying out precise forest quality enhancement management to improve quality and sink enhancement,and exploring synergistic enhancement pathways for transferring carbon sinks of forest ecosystems to carbon pools of woody forest products through the utilization of carbon resources.
国家科技期刊平台
NSTL
万方数据
