基于灌木林碳储量估算的植被含碳率取值

Value-taking for vegetation carbon content rate based on the estimation of shrubbery carbon storage

利用内蒙古东部3种灌木各器官含碳率的实测数据,探讨评估灌木林碳储量的含碳率取值问题。结果表明,1)各灌木林叶、枝和根的生物量分别占树种生物量的10%~20%、40%~60%和30%~40%,表明枝生物量占总生物量1/2左右,而根系生物量占1/3左右。2)天然山杏(Prunus sibirica)、人工山杏、人工柠条(Caragana korshinskii)和虎榛子(Ostryopsis decne)的叶、枝、根含碳率的范围分别为0.428 7~0.456 7、0.445 9~0.462 8、0.397 3~0.431 3g C·g^(-1),根的含碳率均与地上器官含碳率差异较大,叶和枝含碳率之间的差异较小。3)当天然山杏、人工山杏、虎榛子和人工柠条的地上部分和根系含碳率分别取值0.45和0.42时,其地上碳密度分别为1.370 7、1.167 7、198.873 0和2.157 3t·hm^(-2),根系碳密度分别为0.941 6、0.401 5、100.908 8和0.721 1t·hm^(-2),与实测碳密度相比,其相对误差均在6%以内。

The carbon content of three shrubs organs were measured in the eastern Inner Mongolia,in order to discuss the problems of the carbon content rate.Results showed that：1）The biomass of shrub leaf,branch and root accounted for 10%to 20%,40% to 60% and 30% to 40%,respectively,which showed that branch biomass accounted for half,the root biomass accounted for about a third of the total biomass.2）The range of carbon content rate of leaf,twigs,roots of natural Prunus sibirica,artificial P.sibirica,artificial Caragana korshinskii and Ostryopsis decne were 0.428 7to 0.456 7g C·g^-1,0.445 9to 0.462 8g C·g^-1,0.397 3to0.431 3g C·g^-1,respectively.The carbon content of the root have a significant difference with the ground organs carbon,the carbon content rate variance between leaves and branches varied with the tree species.3）When the carbon content rate values of ground parts and root parts of natural P.sibirica,artificial P.sibirica,artificial C.korshinskii,O.decne were 0.45 and 0.42,respectively,the levels of ground carbon density were1.370 7,1.167 7,198.873 and 2.157 3t·hm^-2,carbon density of roots were 0.941 6,0.401 5,100.908 8and 0.721 1t·hm^-2,respectively.The relative errors was within 6%compared with the carbon density calculated by measured carbon content rate of the ground and the root system.