兴安落叶松林植被层碳密度分配及固碳潜力

CARBON DENSITY DISTRIBUTION AND CARBON SEQUESTRATION POTENTIAL OF VEGETATION LAYER IN Larix gmelinii FOREST

加强对兴安落叶松林碳储量和固碳潜力的研究,是制定大兴安岭地区增汇能力的重要依据。在根河地区,选择不同年龄的兴安落叶松林,运用空间代替时间的方法,分析碳密度空间分布特征,计算不同龄组固碳潜力。结果如下:兴安落叶松林植被层碳密度随着林龄增加而增加,幼龄林、中龄林、近熟林和成熟林分别为53.17 t·hm^-2、104.61 t·hm^-2、129.30 t·hm^-2、140.15 t·hm^-2。各层碳密度大小顺序基本为:乔木层>枯落物层>木质物残体>灌木层>草本层>藓被层,分别占植被层碳密度的79.71%~85.78%,8.81%~15.28%、1.11%~5.62%、0.69%~3.54%、0.19%~1.39%和0~0.15%。其中,活地被物占植被碳密度的81.66%~90.71%。从幼龄到近熟林阶段,兴安落叶松林固碳潜力分别为86.98 t·hm^-2、35.54 t·hm^-2和10.55 t·hm^-2。大兴安岭兴安落叶松林幼中龄林比重大,若对现有森林进行科学管理,可以发挥巨大的碳汇潜力。

To strengthen the research of forest carbon storage and carbon sequestration potential,which is an important basis for the development policy of increasing carbon sequestration in The Greater Khingan Mountains.Larix gmelinii forest of different ages was selected to analyze the spatial distribution of carbon density using the method of space instead of time.The results were as follows: The carbon density of Larix gmelinii plantations increased with the increase of stand ages,and The ecosystem carbon densities of the young,middle-aged,near-mature and mature forests were 53.17 t·hm^-2,104.61 t·hm^-2,129.30 t·hm^-2,140.15 t·hm^-2.The order of carbon density in each layer was as follows: tree layer> litter layer>wood residue>shrub layer>herb layer>moss layer,accounting for 79.71%-85.78%,81%-15.28%,1.11 %-5.62%,0.69%-3.54%,0.19%-1.39% and 0-0.15%.Among them,the living land cover accounted for 81.66%-90.71% of the vegetation carbon density.The carbon sequestration of Larix gmelinii were 86.98 t·hm^-2,35.54 t·hm^-2and 10.55 t·hm^-2,In the Greater Khingan Mountains,middle-aged forests had a greater proportion than the forests in other age classes.If the existing forest is managed scientifically,it can exert great potential for carbon sink.