| The change rules of biomass and carbon density in forest ecosystem are important for scientific management in carbon foresty. This study discussed the change rules of biomass and carbon density of tree layer, shrub layer, herb layer and litter layer, basing on investigating sample plots and measuring carbon content in Pinus massoniana plantation of different growth period in Ji'an Jiangxi. The results can provide reference for scientific management of Pinus massoniana plantation. The main results showed as follows:(1) The biomass of vegetation of P. massoniana plantation with the increase of stand age respectively is 50.077 t/hm2, 58.972 t/hm2, 87.201 t/hm2,130.406 t/hm2. There is a positive correlation between biomass of vegetation and tree layer and age of forest. Biomass from tree layer is the key component of vegetation, biomass of trunk is the key component of tree layer. There is no observed correlation between biomass of shrub layer, herb layer and litter layer and age of forest. Biomass of each fraction at different age groups accounted for the proportion of the total biomass was different, biomass distributing sequence of different fractions in young forest, middle-age forest and mature forest is: tree layer > herb layer > shrub layer > litter layer, near-mature forest is: tree layer > shrub layer > herb layer > litter layer.(2) The carbon density of vegetation of P. massoniana plantation with increase of stand age respectively is19.605t/hm2, 22.427 t/hm2, 38.924 t/hm2, 54.927 t/hm2. There is a positive correlation between carbon density of tree layer and age of forest, carbon densiity from tree layer is the key component. But There is no observed correlation between carbon density of shrub layer, herb layer and litter layer and age of forest.(3) The carbon sequestration potential of forest vegetation of P. massoniana plantation with increase of stand age respectively is 2.073 t/hm2?a?1.752 t/hm2?a?1.842 t/hm2?a?1.664 t/hm2?a?. |
PDF Full Text Request