Carbon accumulation and spatial distribution as well as their variations in three different age(8-year-old,14-year-old and 28-year-old) stands of Taiwania flousiana plantation ecosystem were investigated in Nandan Sha...Carbon accumulation and spatial distribution as well as their variations in three different age(8-year-old,14-year-old and 28-year-old) stands of Taiwania flousiana plantation ecosystem were investigated in Nandan Shankou Forestry Station of Guangxi,China. The results showed that carbon content in different organs of T.flousiana ranged form 418.4 g·kg-1 to 516.4 g·kg-1,which was in order as follows:bark>branch>stem>root>leaf. The vertical distribution of carbon content within the stand was in the following order:tree layer>shrub layer>herb layer.Carbon content in the soil obviously declined with increased soil depth from 0 to 80 cm. Total carbon storage in the ecosystems was 159.37,194.21 and 278.22 t·hm-2,respectively for 8-year-old,14-yea-old and 28-yea-old stands. The tree layer in the three-age stands respectively accounted for 18.30%、28.37% and 43.59%;the shrub and herb layers for 0.14%、1.17% and 1.44%;the litter layer for 0.33%、0.89% and 1.11%;the soil for 81.23%、69.58% and 54.78% of the total storage of carbon. Carbon storage in different organs was roughly in proportion to the biomass of corresponding organ. For example,stem occupied the greatest proportion of carbon storage in the trees,up to 46.37%,and increased with the stand age while branches,leaves,bark and roots occupied more than 37.32%. The annual net productivity of the 8-year-old,14-year-old and 28-year-old T.flousiana plantation was respectively 8.93,10.82 and 12.53 t·hm-2a-1,and annual net carbon storage was respectively 4.19,5.07 and 5.93 t·hm-2a-1.展开更多
To provide potential implications of species selection for carbon plantation, differences in carbon sequestration pattern and net ecosystem production (NEP) were determined between two 36-year-old plantations of broad...To provide potential implications of species selection for carbon plantation, differences in carbon sequestration pattern and net ecosystem production (NEP) were determined between two 36-year-old plantations of broadleaved species, Castanopsis kawakamii and Cunninghamia lanceolata, in Sanming, Fujian. Annual net carbon sequestration was 13.639 and 6.599 t C·hm -2 a -1 , respectively, in the C. kawakamii and the C. lanceolata, among which the annual biomass C increment and the litterfall production was evenly distributed. To the annual net carbon sequestration, the contribution of stem (wood plus bark) increment was much lower, and that of branch increment was much higher in the C. kawakamii than in the C. lanceolata (26.6% versus 40.3%, and 11.5% versus 0.3%). In both plantation, the above and belowground litterfall accounted 60% and 40% respectively for the annual litterfall production, which was estimated 7.183 t C·hm -2 a -1 in the C. kawakamii and 3.554 t C·hm -2 a -1 in the C. lanceolata. Annual soil heterotrophic respiration was responsible for a C loss of 5.983 and 2.984 t·hm -2 a -1 from soil to atmosphere in the C. kawakamii and the C. lanceolata, respectively. Carbon balance analysis showed there were a positive net ecosystem production (C sink), 7.656 and 3.615 t C·hm -2 a -1 , for the C. kawakamii and the C. lanceolata, respectively. For the purpose of carbon management, C. kawakamii might be a more suitable species than C. lanceolata in local region.展开更多
文摘Carbon accumulation and spatial distribution as well as their variations in three different age(8-year-old,14-year-old and 28-year-old) stands of Taiwania flousiana plantation ecosystem were investigated in Nandan Shankou Forestry Station of Guangxi,China. The results showed that carbon content in different organs of T.flousiana ranged form 418.4 g·kg-1 to 516.4 g·kg-1,which was in order as follows:bark>branch>stem>root>leaf. The vertical distribution of carbon content within the stand was in the following order:tree layer>shrub layer>herb layer.Carbon content in the soil obviously declined with increased soil depth from 0 to 80 cm. Total carbon storage in the ecosystems was 159.37,194.21 and 278.22 t·hm-2,respectively for 8-year-old,14-yea-old and 28-yea-old stands. The tree layer in the three-age stands respectively accounted for 18.30%、28.37% and 43.59%;the shrub and herb layers for 0.14%、1.17% and 1.44%;the litter layer for 0.33%、0.89% and 1.11%;the soil for 81.23%、69.58% and 54.78% of the total storage of carbon. Carbon storage in different organs was roughly in proportion to the biomass of corresponding organ. For example,stem occupied the greatest proportion of carbon storage in the trees,up to 46.37%,and increased with the stand age while branches,leaves,bark and roots occupied more than 37.32%. The annual net productivity of the 8-year-old,14-year-old and 28-year-old T.flousiana plantation was respectively 8.93,10.82 and 12.53 t·hm-2a-1,and annual net carbon storage was respectively 4.19,5.07 and 5.93 t·hm-2a-1.
文摘To provide potential implications of species selection for carbon plantation, differences in carbon sequestration pattern and net ecosystem production (NEP) were determined between two 36-year-old plantations of broadleaved species, Castanopsis kawakamii and Cunninghamia lanceolata, in Sanming, Fujian. Annual net carbon sequestration was 13.639 and 6.599 t C·hm -2 a -1 , respectively, in the C. kawakamii and the C. lanceolata, among which the annual biomass C increment and the litterfall production was evenly distributed. To the annual net carbon sequestration, the contribution of stem (wood plus bark) increment was much lower, and that of branch increment was much higher in the C. kawakamii than in the C. lanceolata (26.6% versus 40.3%, and 11.5% versus 0.3%). In both plantation, the above and belowground litterfall accounted 60% and 40% respectively for the annual litterfall production, which was estimated 7.183 t C·hm -2 a -1 in the C. kawakamii and 3.554 t C·hm -2 a -1 in the C. lanceolata. Annual soil heterotrophic respiration was responsible for a C loss of 5.983 and 2.984 t·hm -2 a -1 from soil to atmosphere in the C. kawakamii and the C. lanceolata, respectively. Carbon balance analysis showed there were a positive net ecosystem production (C sink), 7.656 and 3.615 t C·hm -2 a -1 , for the C. kawakamii and the C. lanceolata, respectively. For the purpose of carbon management, C. kawakamii might be a more suitable species than C. lanceolata in local region.
