| This research focused on studying carbon storage and carbon density of main forest ecosystems in Baisha County, Hainan Province.This paper collected and sorted out forest resource inventory data for management in1993and2009, as well as related historical materials. Furthermore, This study used biomass model and calculate method between carbon storage and carbon emission which is stated in Guidelines for Provincial Greenhouse Gases List (Trial) which is issued by State Develop and Plan Department. This study concluded characteristics of carbon storage and carbon density of main forests in Baisha County. It also explored affecting factors which influence carbon storage change. The results showed that:1. In1993, the total carbon storage of main forests types in Baisha was4,417,680tons. However, the most carbon storages were in broad-leaved forest and rubber trees, which were3,534,700tons and717,230tons respectively, accounted for80.01%and16.24%in total carbon storage. In2009, the total carbon storage of main forests types in Baisha had reached to6,822,650tons. The most carbon storages were in broad-leaved forest and rubber trees, which were4,107,270tons and2,205,650tons respectively, accounted for60.20%and32.33%. It showed distribution of forest types in Baisha County was uneven. Broad-leaved forest and rubber trees took over leading role for carbon storages in Baisha County.2. Forest age structure is a main affecting reason for forests carbon function. In1993, the rank of carbon storage for different age forests of Baisha County main forest types from most to least was as follow:near-mature forest> middle-age forest> mature forest> over-mature forest> young forest. In2009, the rank of carbon storage for different age forests of Baisha County main forest types from most to least is as follow:middle-age forest> mature forest> near-mature forest> over-mature forest> young forest. As to same age forest, the area and timber storage were different for different kinds of trees. The ways for forest management also put important influence on carbon storage too. As a result, different forests showed different capacity of carbon sequestration.3. The total forest areas of man-made forest in Baisha County had increased89,499.3hm2during twice investigation in1993and2009. However, the total areas of natural forests had decreased1,876.7hm2at the same time, which accounted for2.49%of natural forests around nationwide in2009. In1993, average carbon density of natural forest was higher than average of nationwide. In contrast, average carbon density of man-made forest was lower than average of nationwide. In2009, both average carbon density of man-made forests and natural forests were higher than average of nationwide, which showed the quality of forest had improved from1993to2009. However, viewed from distribution of forest age, age structure was not reasonable enough. There were more middle-age forests and less over-mature forests for natural forests, more young forests and less over-mature forests for man-made forests. Carbon densities of young and middle age forest were lower than near-mature, mature forest, as well as over-mature forests. Therefore, Baisha County’s forest still has comparatively huge rise upside potential for carbon sinks capacity.4. According to Forest Ecological Service Function Evaluation Criteria which was issued by the State Forest Bureau on April28th,2004, in1993total value of forest carbon fixation in Baisha County was5,301,220,000Yuan. Among them, the forest carbon fixation values were highest for broad-leaved forest and rubber trees, which accounted for80.01%and16.24%respectively. The carbon fixation value for those two kinds of forest types had account for96.25%in total. In2009, the total value of forest carbon fixation in Baisha County was reach to8,187,180,000Yuan. Among them, the forest carbon fixation values were highest for broad-leaved forest and rubber trees, which accounted for60.20%and32.33%respectively. The carbon fixation value for those two kinds of forest types had account for92.53%in total. It showed, total areas of natural rubber trees had expanded rapidly during this period. The carbon fixation value had raised a lot, which also indicated forests in Baisha County had immense potential. Those values would play an increasingly important role for development of forest ecological economy and ecological environment construction in Baisha County.5. The forest carbon storages of Baisha County in1993and2009were31970tons and55150tons respectively, based on the estimation from State Develop and Plan Department’s greenhouse gases lists. The carbon absorption was23,180tons from1993to2009. During15years, from1993to2009, there were2819.3hm2non-forest land conversed into forest land every year, which might caused decrease of111,640tons greenhouse gases emission in Baisha County.6. In case of unchanged of forest coverage and main dominant species of forests, it is predicted forest carbon storage in Baisha County would reach to393,630tons in six years which is from2010to2015. The total contribution of carbon sink would reach to122,406tons. From2010to2015, carbon emission of region energy consumption (equal value) would increase274,940tons. Contribution of forest carbon sinks would reach to146,890,000Yuan in six years from2010to2015. |
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