| Forest ecosystem plays an important rule on the global carbon cycle, its influence on the global carbon cycle is one of the focal points to which the people alway pay attention. In recent years, the ecology and economic benefits of the forest carbon-sink also more and more are received the value of the various countries. Hunan Province is situated at the subtropics, which is one of key forest zone in southern of our country. And its forest plants are plentiful. This research take several kinds of the main forest types of Hunan as the targets, through the estimate method of actual survey and based on the data of the Hunan forest resource inventory(1999-2003), research on the carbon content of different forest organs, the estimate method of carbon storage in region forest ecosystem, measure the ability of carbon storage, and estimate on the economic value of the forest carbon storage ability and so on. For the purpose of exploring the appropriate method to accurate estimate the ability of carbon-sink and appraisal its economic value in region forest ecosystem, and discussed the corresponding ecology counter measure to enhance the carbon-sink of forest ecosystem the quantity and its economic value of Hunan province. Through the massive data acquisition and experimental study work, the main results of the research are as follows:The carbon content of main forest types in various organs of Hunan Province were between 40.05%～58.12%. The Masson Pine had the highest average carbon content in the main forest types, which achieved 55.00%;Chinese fir was 50.22%, and Slash pine was 51.54%; In broadleaf forest Chinese sweet gum had the highest carbon content (52.68%), the secondly was Oak tree (50.08%), and the smallest was Camphor tree (46.38%). The carbon density decreasing from the top to the bottom in following order:Oak tree> Camphor tree> Chinese sweet gum> Chinese fir> Masson pine> Slash pine. The total carbon storage of forest plant was 222.0258×106t C, conifer accounts for 46.14%, and the broadleaf forest accounted for 53.86%. The average carbon content of soil displayed as: Chinese sweet gum> Oak tree forest> Masson pine> Chinese fir> Slash pine> Camphor tree, the carbon content in soil layer (0-15cm) was the highest, which droped along with the depth of soil increase, and the differentiation of the soil organic carbon content gradually reduced. The soil organic carbon storage in per area from the top to the bottom in following order:Oak tree> Chinese fir> Chinese sweet gum> Masson pine > Slash pine> Camphor tree.The total carbon storage of soil was 1053.1124×106t C. The soil carbon storage of different forest types from the top to the bottom was:Chinese fir> Masson pine> Oak tree> Camphor tree> Slash pine> Chinese sweet gum.The total carbon storage of main forest ecosystems which in Hunan was 1275.1382 X 106t C, the soil carbon storage accounted for 82.59%, while the plants only accounted for 17.41%. The carbon storage of different forest ecosystems respectively as follow:Chinese fir (417.7117×106t C), Masson pine (349.9851×106t C), Camphor tree (315.6598 X 106t C), Oak tree forest (145.2242×106t C), Slash pine (33.8316×106t C), Chinese sweet gum (12.7258×106t C).This research chose the method of synthesizing several afforest costs to average the value for the first time, combine the various unit prices in order to value appraisal the forest carbon and made them accurately and reasonable. If according to the estimate method of different afforest cost, get the average economic value was 3.477 billion Yuan; If estimating by the Swedish carbon tax, then was 15.875 billion Yuan. which By weighting the afforest cost value and the Sweden carbon tax to average collects, estimated the average of total economic value of the main forest plants carbon was 1.685 billion Yuan, the soil carbon economic value was 7.991 billion Yuan; The total economic value on carbon storage the function of the main forest ecosystems in Hunan was 9.678 billion Yuan, and the economic valuation of fixing CO2 was amounts to 35.518 billion Yuan. The carbon storage function of each forest type had the positive ratio to their economic valuation. Using the Hunan Province forest resources inventory data, this research also carried on the estimate to the carbon storage of forest plants in Hunan Province. The results indicated that, the total carbon storage of main forest which in Hunan was 94.935 X 106t C, compare with the actual survey carbon storage was much more different. The biggest carbon storage was broadleaf forest, accounted for 34.24%, next was Chinese fir and Masson pine, sum of their carbon storage had achieved 58.482×106t C, and accounted for 61.6%. In different age level group, according to the carbon storage from the top to the bottom in turn arrangement as follow:Broadleaf forest> Masson pine> Chinese fir> Exotic pine> Cypress wood. In young forest center to the broadleaf forest were in majority, accounted for about 59.36%; In near-mature forest,the carbon storage of Masson pine was quite prominent; In the mature forest and the over ripeness forest were Chinese fir take carbon storage as the most, the basic regularity was:Chinese fir> Broadleaf tree> Masson pine> Exotic pine> Cypress wood. Based on the forest resources inventory date, the average carbon density of Hunan forest obtains was very small. The half-mature forest, mature forest and over-ripeness forest were few.According to the computational method of afforest cost and the Swedish carbon tax, compiled the forest carbon of Hunan Province's value which based on the forest resources inventory data was 707.2326 million Yuan, the economic valuation of fixed CO2 might amount to 2.60 billion Yuan. Broadleaf forest's economic value was the highest, accounted for 34.88%, the next was Chinese fir and Masson pine, these carbon storage in economic value of three kind of forests type were nearly accounted for the entire province about 97.63%. The planted forest carbon storage value was 358.1 million Yuan, and the natural forest was 357.1 million Yuan, so the economic value of fixed CO2 were respectively as 1.314 billion Yuan and 1.310 billion Yuan.This research carried on reasonable and accurate estimate to forest ecosystem carbon storage of Hunan Province's at the same time, synthetic study the estimate method on the economic value of carbon to conduct. And established the forest ecosystems carbon to estimate the benefit for gauging it, take the solid carbon as the management goal to discuss forest ecology benefit. At the end, propose the ecology countermeasure and the management strategy to improve the carbon ability increased of main forest types in Hunan.
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