| After industrial revolution, carbon dioxide density in atmosphere was graduallyraising. Global climate change caused by greenhouse effect have been concerned bymultinational government. As one of the important parts of global carbon cycle ecosystem,terrestrial ecosystems became a active field because of its huge organic carbon storage.Estimating of terrestrial ecosystems carbon storage have been a one important content ofglobal change. It was very hard to research storage by severe geography, inconvenienttransportation and lack of data in Qinghai-Tibet Plateau which was the global changesensitive and indicative area, but the technology of 3S (RS, GIS and GPS)made it possible.The study area Quer Mountains located in in northwest Hengduan Mountains whichwas a part of east Qinghai-Tibet Plateau. In this paper, vegetation and soil organic carbonhave been studied in southwest Quer Mountains (365.85km2) terrestrial ecosystems by 3Sand outside data. In this paper, the main results are brought forth as follows:(1) The distributions of mainly vegetation carbon density appear as gobbets and theaverage vegetation carbon density of study was 56.06 t hm-2. From the spatial pattern, thevegetation carbon density of alpine and subalpine in north was more higher than dry valleyin south. The highest value region (125-250 t hm-2) mainly exists in the northern bank(between the segment of Echan and Chunlong) of Sequ River and in the southern bank(Gewu and Zhesongdu) of JinSha River; the median value area (60-125 t hm-2) mainlyexists in all bank (between the segment of Echan and Gangtuo) of SeQu River; the lowestvalue region(1-60 t hm-2) mainly exists in northern study area (Gongbudui and Shangyaba),and a long and narrow area which was in the south bank(between the segment of Gangtuoand Shenlongda) of Jinsha river. The three types accounts for 14.94%,30.22% and 54.84%of the total area, respectively.(2) The vegetation carbon storage in southwestern Quer Mountains (365.85km2) wasabout 2.05×106 t. The distribution area of different vegetation was shrub＞coniferous＞broadleaved tree＞grass, while the counts were 24779.33 hm2, 5570.46 hm2, 4532.63 hm2and 1683.86 hm2. Carbon storage with different vegetation was in order of coniferous＞shrub＞broadleaved tree＞grass, while the counts were 7.80×105 t, 7.62×105 t, 5.09×105 tand 0.02×105 t. The analysis of influencing factors showed that vegetation types and landuse types influence vegetation carbon density apparently. The altitude, slope aspects andslope gradients impact vegetation carbon density more obviously in alpine and subalpinethan in dry valley.(3) The distributions of soil carbon density with different vegetation were the same asthe distribution of vegetation carbon density, the soil carbon density of north was higher than south. The coniferous was highest, followed by broadleaved tree, shrub and grass wasthe poorest. The counts of different vegetation soil carbon density were 30.02 kg m-2, 23.7kg m-2, 19.26 kg m-2 and 18.9 kg m-2. Influenced by vegetation types and root to shootration, the vertical variation of soil carbon density was very apparent. The soil carbonstorage of study area was 7.84×106 t, the order of variation with different vegetation wasshrub＞coniferous＞broadleaved tree＞grass, the counts were 4.77×106 t, 1.67×106 t,1.07×106 t and 0.32×106 t.(4) The total organic carbon storage of vegetation and soil was 9.89×106 t. Thecontent of organic carbon was shrub＞coniferous＞broadleaved tree＞grass in study area,while the counts were 5.53×106 t, 2.45×106 t, 1.58×106 t and 0.33×106 t. The result of studyshowed that the total organic carbon storage of study area was very huge. The main carbonpool was soil carbon which was 3.82 times than the vegetation carbon storage, meanwhilethere was a strong correlation between soil carbon density and relevant vegetation carbondensity. Above all, protect the vegetation of study area and increase rate of forest coveragewas not only important to restore ecological but also to enhance capacity of vegetation andsoil absorbing carbon. |
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