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基于野外调查与室内实测数据,结合第八次全国森林资源清查资料,分析了甘肃省5种典型人工林生态系统(刺槐、杨树、油松/华山松、落叶松及云杉林)森林生态系统碳密度、碳储量,并估算了乔木层固碳潜力.结果表明:5种典型人工林生态系统平均碳密度和总碳储量分别为139.65 t·hm~(-2)和85.78 Tg,不同人工林类型之间差异较大.不同龄组间碳密度表现为近熟林(250.70 t·hm~(-2))最大,其次是成熟林(175.97 t·hm~(-2))和中龄林(156.92 t·hm~(-2)),幼龄林(117.56 t·hm~(-2))最低.碳储量表现为幼龄林(45.47 Tg)>中龄林(19.54 Tg)>成熟林(11.84 Tg)>近熟林(8.93 Tg),幼中龄林碳储量占总碳储量的75.9%.5种典型人工林乔木层现实固碳潜力合计为7.27 Tg,刺槐林(2.49 Tg)和杨树林(2.10 Tg)最大;各龄组中,幼龄林现实固碳潜力最大(3.78 Tg),其次是中龄林(2.04 Tg),近熟林最小(0.45 Tg).5种典型人工林乔木层最大固碳潜力达27.55 Tg,表现为刺槐林(9.42 Tg)>落叶松林(6.22 Tg)≈云杉林(6.36Tg)>杨树林(3.18 Tg)>油松/华山松林(2.37 Tg);其中,幼、中龄林最大固碳潜力分别为18.48和6.89 Tg,占总最大固碳潜力的92%.
Based on the field survey data and laboratory measurements, and combined with the eighth national inventory of forest resources, the ecological characteristics of five typical plantation ecosystems (Robinia pseudoacacia, Poplar, Pinus tabulaeformis, Pinus armandii, Larix gmelinii and Picea mongolica) in Gansu province were analyzed. The results showed that the average carbon density and total carbon storage of the five typical plantation ecosystems were 139.65 t · hm -2 and 85.78 Tg, respectively, with different artificial There was a significant difference in forest types among different age groups. The carbon density of different age groups was the highest (250.70 t · hm -2), followed by the mature forest (175.97 t · hm -2) and middle age (156.92 t · hm -2), and the lowest in young forest (117.56 t · hm -2) .The carbon stocks of young forest (45.47 Tg)> middle forest (19.54 Tg)> mature (11.84 Tg)> near-mature forest (8.93 Tg), and the young middle-aged forest carbon storage accounted for 75.9% of the total carbon storage.The actual carbon sequestration potential of arbor layer in the five typical plantations was 7.27 Tg, 2.49 Tg And poplar (2.10 Tg) were the highest in all age groups. Among all the age groups, the realistic carbon sequestration potential of juvenile forest was the highest (3.78 Tg), followed by the middle-aged forest (2.04 Tg) and the near-mature forest Arboreal maximum carbon sequestration potential 27.55 Tg, which ranged from 9.42 Tg to 6.22 Tg for riparian forest (6.32 Tg), 3.18 Tg for poplar forest (3.18 Tg), and 2.37 Tg for Pinus tabulaeformis forest (2.37 Tg) The maximum carbon sequestration potentials were 18.48 and 6.89 Tg, respectively, accounting for 92% of the total maximum carbon sequestration potential.