我国杨树林的碳储量和碳密度

Carbon storage and density of poplars in China

利用第七次全国森林资源清查数据,使用材积源生物量法,测算我国杨树林碳储量及碳密度。结果表明:(1)我国杨树林总碳储量为261.84 Tg,碳密度为25.92 t/hm2,其中,人工林碳储量为179.22 Tg,碳密度为23.67t/hm2;天然林碳储量为82.62 Tg,碳密度为32.65 t/hm2;杨树人工林碳储量占全国乔木人工林总碳储量的15.9%。(2)北方地区杨树人工林碳储量达172.94 Tg,占杨树人工林总碳储量的96.5%,为我国杨树人工林固碳增汇集中区域;内蒙古、河南及山东杨树人工林碳储量分别为35.45、24.51、22.42 Tg,占总碳储量的55.9%,为我国利用杨树人工林固碳增汇的大省。(3)杨树中幼人工林面积达547.68万hm2,占总面积的72.3%,其碳储量达117.95 Tg,占总碳储量的65.9%,是我国杨树人工林碳汇潜力所在。因此,杨树人工林,尤其是北方地区杨树人工林,为我国利用杨树固碳增汇主要森林,也是我国北方人工林重要的碳贮库。

The area of poplars in China had reached 1 010.26 million hm2,which ranked the first place all over the world.However,the amount of carbon dioxide which poplars can fix remains unknown.The carbon storage and density of poplars in China were measured by the volume-derived method according to the data of the seventh national forest inventory.The results showed that：the total carbon storage and carbon density of poplars in China was 261.84 Tg and 25.92 t/hm2,and the carbon storage of poplar plantations and natural forests were 179.22 and 82.62 Tg.The carbon density was 23.67 and 32.65 t/hm2 respectively,and the carbon storage of poplar plantations accounted for 15.9% of total plantations.In northern China,the carbon storage ofpoplar plantations was 172.94 Tg accounted for 96.5% of total carbon storage of poplar plantations.In Inner Mongolia,Henan and Shandong,the carbon storage of poplar plantations were 35.45,24.51 and 22.42 Tg,respectively,which accounted for 55.9% of the total carbon storage of China.Carbon storage of young and middle age poplar plantations was 117.95Tg accounted for 65.9% of the total carbon storage,which had great potential for carbon sequestration.Therefore,poplar plantations in China,especially in the northern region,were the main forests for carbon sequestration.