以全国林业应对气候变化碳汇计量监测体系建设结果数据为基础,应用森林碳库专项调查建立的碳计量模型和参数,结合历次森林资源清查成果数据,估算了2020年京津冀地区林地和其他生物质碳汇量,测算了重点生态工程和重大战略实施区对京津冀地区碳汇量的贡献。结果表明:1)2020年京津冀地区林地碳汇量23.918Tg CO₂/a、散生木和四旁树等其他生物质碳汇量0.467 Tg CO₂/a。林地和其他生物质碳汇量中,乔木林地所占比例最大;京津冀地区3个省(市)中,河北省林地和其他生物质碳汇量最大,天津市最小;生物量碳库贡献最大(92.13%);“一直为林地的土地”产生碳汇量贡献最大(87.67%),其中“一直为乔木林的土地”产生的碳汇量占79.78%。2)通过3个重点生态工程(京津风沙源治理工程、三北防护林工程、太行山绿化工程)和1个重点战略实施区(京津冀协调发展区)对京津冀地区林地碳汇量贡献的测算分析可知,“京津冀协同发展区”贡献率最大(65.31%),其次是“京津风沙源治理工程”“太行山绿化工程”,其贡献率分别为37.55%和34.16%;三北防护林工程影响较小。

Based on the data of carbon measurement and monitoring system of China's forestry addressing climate change,carbon storage and carbon sink of forest land and other biomass in the Beijing-Tianjin-Hebei Region in 2020 andthe contribution of the key ecological projects and the key strategic implementation area to the carbon sinks in the Beijing-Tianjin-Hebei Region were estimated by using the carbon measurement model and parameters established by the specific survey of forest carbon pools,also combining the previous national forest inventory data.The results showed that:1)In 2020,the carbon sink of forest land in the Beijing-Tianjin-Hebei Region was 23.918 Tg CO₂/a,and the carbon sink of other biomass such as scattered trees and four-side trees was 0.467Tg CO₂/a.The arbor forestland accounted for the largest proportion of the total carbon sink of forest land and other biomass.Among all 3 provinces/cities in the Beijing-Tianjin-Hebei Region,the carbon sink of forest land and other biomass of Hebei Province took the 1st place,while Tianjin was the last.The biomass contributed the most(92.13%)to the carbon sinks of forest land and other biomass.‘Land that has always been forest land’ contributed the most to the carbon sinks of forest land and other biomass(87.67%),of which the carbon sink generated by the land that has always been arbor forest accounted for 79.78%.2)The contribution of three key ecological programs(namely,the Beijing-Tianjin Sandstorm-Control Program,the Three-North Shelterbelt Program and the Taihang Mountain Afforestation Program)and one key strategic implementation area(namely,the Beijing-Tianjin-Hebei Coordinated Development Zone)to the carbon sinks of forest land in the Beijing-Tianjin-Hebei Region was measured and analyzed.Among the three key ecological programs and one key strategic implementation area,the Beijing-Tianjin-Hebei Coordinated Development Zone made the largest contribution(65.13%),followed by the Beijing-Tianjin Sandstorm-Control Program and the Taihang Mountain Afforestation Program(37.55% and 34.16%,respectively),while the Three-North Shelterbelt Program had less impact.