| The researches on the global climate change have developed into one of frontier fields of ecological science and environment science. It is characterized by temperature rising and carbon dioxide concentration diploidizing. Forest, as the biggest carbon pool in ecosystem on earth, has taken an important position in global carbon cycling. Any increase or decrease in the carbon storage may directly affect atmospheric carbon dioxide concentrations. Forest eco-systems is a dynamic carbon pool which is not only changes with time, but also changes with location and climate factors. The ability that vegetation stores carbon is not only related to forest cover rate and forest acreage (quantitative relation), but also relate to forest carbon density (qualitative relation). So research on the quality change of forest vegetation is as important as research on its variation in quantity. The research on forest carbon density is significant to study climate change caused by greenhouse gases.Recently, there are many studies about forest carbon stock and carbon density analysis, but most of the results have large uncertainties. Many scholars think that as vegetation types in forest eco-systems are different, so research subjects on a greater scale has the diversity and complexity. The difference in results may caused by adopting different model and research methods, or caused by inconsistency in basic data and computing methods. Liangshan Yi Autonomous Prefecture covers a vast geographic area, and the forest vegetation type is diversity. Therefore, in order to obtain the forest carbon stock and carbon density, the choice of research methods should be combined with region’s unique natural conditions. We can increasing measurement accuracy and trustworthiness for the estimates of carbon cycling in Liangshan Yi Autonomous Prefecture.Liangshan Yi Autonomous Prefecture is situated at intersection point of upstream Yangtze River, the main stream of Jinsha River, Yalong River and Dadu River flow through its territory for over1200kilometers, there are many rivers in this territory. Its particular ecological niches and unique natural resources advantage plays an important role in the research. In the meantime, it has unique function of water conservation because the main stream of Yangtze River flows through its territory. It has special positions in land-ecosystem of Sichuan. Based on the research before, we used aggregated data of Liangshan Yi Autonomous Prefecture defined by forest classify zoning (the year2008) to study the carbon density of different forest vegetation form. The objective of this paper is to supply the basic data for the research of forest carbon stock in Liangshan Yi Autonomous Prefecture, and provide basic data for forestry sector and environmental bureaus.This paper estimates forest vegetation total biomass of Liangshan Yi Autonomous Prefecture by modeling methods. The vegetation total biomass was189m tonnes, of which the biomass of young-aged forests, middle-aged forests, near-mature forests, mature forest and over-mature forests were1.7m tonnes,26m tonnes,52m tonnes,79m tonnes and30m tonnes, accounting for0.902%,13.762%,27.392%,41.931%and16.012%, respectively, of the total.The forest vegetation total carbon stock of Liangshan Yi Autonomous Prefecture was95m tonnes, the total area is2.74m hectare, and the average carbon intensity was34.54tonnes per hectare. Among them, the carbon stocks of hardwoods, Yunnan pine, dragon spruce, fir and other pines were28m tonnes,26m tonnes,23m tonnes and16m tonnes, respectively. And the carbon intensities of them were57.64tonnes per hectare,23.89tonnes per hectare,58.4tonnes per hectare and38.75tonnes per hectare. The areas of different vegetation types were0.49m hectare,1.07m hectare,0.39m hectare and0.41m hectare, respectively.The carbon stocks of hardwood, Yunnan pine, dragon spruce, fir and other pines accounts for97.7%of the total, is the main part of forest vegetation carbon stock of Liangshan Yi Autonomous Prefecture. Of which the carbon stock of hardwoods was the largest, was28m tonnes, which accounts for29.7%of the total. It is related to its carbon intensity was57.64tonnes per hectare. Fir, cryptomeria trees, softwoods and eucalyptus accounts for13.3%of the total, its carbon stock only accounts for1.8%of the total. And its ability of fixing N is not very good, with a carbon intensity of4.83tonnes per hectare.It has been found that the carbon stocks of different vegetation types were directly proportional to its vegetation area through analysis. The larger the vegetation area, the larger carbon stock it has. So the content of carbon stock was directly related to its vegetation area.The forest vegetation carbon intensities of Liangshan Yi Autonomous Prefecture were higher in the western part and lower in the eastern part. The carbon intensity and the forest quality were consistent with the location of the vegetation. The forest eco-systems of Liangshan Yi Autonomous Prefecture were divided into three administration areas by vegetation carbon stock and carbon intensity, they were the east and southeast forest, the forest of the central and the west and north forest. The east and southeast forest:Because the carbon intensity of this region was the minimum, we can take the following measures:we should not only protect the existing forest vegetation but also protect the forest vegetation by creating protective area. And scientific forest management should be enhanced to improve forest resource quality, for example, low yield forest transformation, forest tending and forest closing. At the same time, we should build more artificial forests to increase the storage of carbon. The forest of the central:the carbon intensity of this region was relatively small and its population density was large. In order to increase the carbon intensity of this region, we should close the forest and build more artificial forest in key forest areas and sensitive areas. The west and north forest:the carbon intensity of this region was very high and the population density was small. In order to guarantee the sustainable development of local forestry, we should take corresponding methods to prevent carbon release caused by forest fires and plant diseases. |
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