广东省桉树碳储量和碳汇价值估算

利用雷州林业局2002年二次森林清查资料和广东省林业调查的研究资料,分析了不同龄组的桉树各器官的碳含量在乔木碳含量中的比例,并初步探讨碳密度随蓄积量的变化趋势,在此基础上估算了2002年广东省桉树林的碳储量和碳汇价值。结果表明,不同龄组各组分碳含量比例有明显差异,桉树的碳含量主要表现为树干的碳含量。对于幼龄林,各器官所含碳含量的分配格局是干>皮>叶>根>枝,对于中龄林、近成熟林、成熟林和过熟林,各器官的碳含量分配格局基本一致,为干>根>皮>枝>叶。不同龄组的碳密度,均随林分蓄积量的增加而增加。2002年广东省桉树总碳储量约为1 153.32万t,其中中龄林碳储量最多为443.13万t,而过熟林由于立地面积较少,仅为21.65万t。成熟林的碳密度最大,为50.50 t/hm2,碳密度最小的是幼龄林,为12.72 t/hm2。采用造林成本法和瑞典碳税法计算不同龄组桉树的碳汇价值,结果表明,成熟林最高,为12 695.06～51 280.18元/hm2。两种估价方法取平均,估算2002年广东省桉树的碳汇总价值为51.92亿元。

Carbon Storage and Value of Carbon Sinks of Eucalyptus in Guangdong Province

A study was performed to analyze the carbon content in various organs of Eucalyptus of different age groups as well as the changing trends in carbon density with volume using data of the second-level forest inventory in Leizhou Forestry Bureau and the forest survey data of Guangdong Province.And the carbon storage and value of Eucalyptus in Guangdong Province in 2002 were estimated.A significant difference was observed in the proportion of carbon content of each component.For the young forests,the carbon content in trunk was the highest,followed by bark,leaves,roots,and branches;for the middle-aged forests,near mature forests,mature forests and over-mature forests,the carbon content in trunk was the highest,followed by roots,bark,branches,and leaves.The carbon density for different age classes all increased with increasing volume.The total carbon storage of Guangdong Province in 2002 was 11.533 2 million tons,among which the middle-aged forests exhibited the largest carbon storage(4.431 3 million tons),while the carbon storage of the over-mature forests was only 0.216 5 million tons due to the smallest site area.The carbon density of the mature forests was the highest(50.50 tons per hectare),while that of the young forests was the lowest(12.72 tons per hectare).The total value of carbon sto-rage of Eucalyptus in Guangdong Province in 2002 was evaluated by the afforestation cost method and the Sweden’s carbon tax.Results show that the total value was 5.192 billion yuan,and the mature forests exhibited the highest of carbon value(12 695.06-51 280.18 yuan per hectare).