Research On Two Stands Of Forest Carbon Sequestration Capacity In Xiamen

With the development of global industrialization,the atmospheric concentrations of greenhouse gases continue to rise and global warming is causing more and more attention.As a major component of terrestrial ecosystem,the carbon sequestration capacity of forest plants is increasingly significant which plays an important influence on the change of global climate.Carbon storage in forest ecosystems includes carbon storage in vegetation,litter layer carbon storage and carbon storage in the soil layer.The existing carbon stocks are the major evaluation scale of functions with absorbing CO2 for forest ecosystems.As an important forest resources in southern China,Pinus massoniana is an important species which was widely planted in Fujian Province.Acacia mangium is a species mostly planted in mountainous coastal area.The carbon storage in pure forest of P.massoniana and A.mangium in urban forest ecosystems of Xiamen was studied.The two different stands of forest carbon stocks,distribution patterns and their impact factor were explored,providing basic data for future proposal to increase urban forest carbon sequestration capacity of ecosystems.The main findings were as follows.1 The single biomass allocation of organs for P.massoniana was trunk>root>branch>leaf,and the single biomass allocation with slope position was lower slope>middle slope>upper slope.The biomass allocation of Litter layer was as follows:leaf>branch>crumbs>fruit>flowers,leaves biomass accounted for more than 70%of the litter ayer.The stand biomass with slope positions was lower slope(64.31 t·hm-2)>middle slope(62.69 t·hm-2)>upper slope(31.53 t·hm-2).Vertical distribution pattern of community biomass were as follows:tree layer>litter layer.Carbon storage of lying vegetation with slope position was lower slope>middle slope>upper slope.Carbon storage in the soil layer increased as the soil depth decreased,which was consistent with the distribution of soil carbon content.The carbon storage in pure forest of P.massoniana with slope position was lower slope>middle slope>upper slope.Spatial distribution pattern of carbon stocks stand was as follows:soil layer>tree layer>litter layer with soil layer the largest.2 The single biomass allocation of organs for A.mangium was trunk>root>branch>leaf,and the single biomass allocation with slope position was lower slope>middle slope>upper slope.The biomass allocation of Litter layer was as follows:leaf>branch>crumbs>flowers>fruit,leaves biomass accounted for more than 80%of the litter ayer.The stand biomass with slope positions was lower slope(233.12 t·hm-2)>middle slope(158.23 t·hm-2)>upper slope(150.61 t·hm-2).Vertical distribution pattern of community biomass were as follows:tree layer>litter layer.Carbon storage of lying vegetation with slope position was lower slope>middle slope>upper slope.Carbon storage in the soil layer increased as the soil depth decreased,which was consistent with the distribution of soil carbon content.The carbon storage in pure forest of A.mangium with slope position was lower slope>middle slope>upper slope.Spatial distribution pattern of carbon stocks stand was as follows:tree layer>soil layer>litter layer with tree layer the largest.3 The biomass of A.mangium forest was larger than P.massoniana forest.Variance analysis showed that the difference levels between them was significant(p<0.01).The results showed that slope position has a great influence on the forest biomass and carbon storage.The research of A.mangium pure forest carbon sequestration capacity was significantly higher than P.massoniana pure forest,A.mangium pure forest carbon sequestration of urban forest ecosystems of Xiamen to better.