| Forest ecosystems play an increasingly important role in not only adjusting the global carbon balance but also slowing up the increase in the concentrations of these greenhouse gases and vindicating the territorial environment and so on. CO2 gas density in the atmosphere was continuing increasing which might effect the global climate change as a result of the overexploitation of forest resources. At present academia generally deemed that tropical, temperate and boreal forest ecosystems are carbon sinks, and there is a controversy about whether subtropical forest ecosystems are carbon sinks or not. So it is important to define the relations between source and sink in subtropical forest ecosystems, especially the plantation ecosystems.Based on the inventory data of three periods from 1996 to 2007 and references relevant to them, this paper used volume-biomass to estimate forest carbon and carbon density and its dynamic changes in Fujian Province, and then using Kaya identity to study the forest contribution in reducing regional carbon emissions preliminary. The results showed that the forest carbon storage in Fujian Province increased from 1.78×108Mg in 1996 to 2.04 X 108Mg in 2007, with annual average accumulation amount of 2.54×106Mg, while the carbon density basin increased from 22.1Mg/hm2 in 1996 to 25.7Mg/hm2 in 2007, mainly due to the increased reforestation and afforestation. For different cities in Fujian, except Nanping, Sanming and Longyan, the carbon storage of plantation forests are lager than natural ones. The carbon storage of its northern part and mideast is larger than that of west central and southern. Plantation forest carbon and forest density show a significant increase, with an increasing rate of 5.1%,4.17%. During the 12 years, state-owned forest have sequestered 4.19 X 106Mg of carbon, with an annual rate of 0.35×106Mg, and the average carbon density of state-owned forest showed a significant increase from 28.93Mg/hm2 in 1996 to 38.67Mg/hm2 in 2007. |
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