Research On Biomass、Carbon Storage And Spatial Distribution Of Picea Schrenkiana And Larix Sibirica In Xinjiang Tianshan And Altay Mountains

As the primary maintainer of ecological environment in Xinjiang, mountain forest is of great significance to regional ecology and the oasis stability. Accurate estimation of carbon density and storage is among the key challenges in evaluating ecosystem carbon sink potentials for reducing atmospheric CO2 concentration, and providing a scientific basis for developing future conservation strategies and sustainable practices in arid region. So based on the field survey data of the 105 sites distributed in the Tianshan and Altay mountains completed in 2011, laboratory analyses, and the forest resource inventories, this paper estimated the Biomass、carbon storage、carbon sequestration potential of mountain forest ecosystem, and analyzed the spatial distribution and influencing factors. The results showed that:⑴ The Picea schrenkianais ecosystem biomass(187.98t·hm–2) was significantly higher than the Larix sibirica ecosystem(126.67 t·hm–2), the two type forest ecosystem biomass in Arbor、Grass and Litterfall layer were respectively: 185.98 t·hm–2 and 120.84 t·hm–2、0.63 t·hm–2and 4.22 t·hm–2、1.38 t·hm–2and 1.61 t·hm–2. Larix sibirica biomass increased with the increasing forest age, and to the top in Over-mature forest; Picea schrenkianais biomass reached the highest in Mature forest, and the rest was in the order of Middle-aged forest > Near-mature forest > Over-mature forest > Young forest. Taken together, Xinjiang forest biomass was higher in Mature forest and Over-mature forest and was low in Young forest.⑵ Altay Larix sibirica ecosystem carbon content ranged from 39.63% to 52.82%, The carbon content in all layers was in the order of Litterfall(51.21%) > Arbor(50.64%) > Grass(41.22%), Trees in the different organs, carbon content from high to low in turn was trunk(51.94%) > leaf(50.55%) > bran ch(50.29%) > root(49.78%), carbon rate of trunk was relatively high, and wa s lowest in root. Picea schrenkianais ecosystem carbon content ranged from 46.56% to 52.22%, The carbon content in all layers was in the order of Arbor(49.21%) > Litterfall(42.27%) > Grass(41.65%), carbon rate of Arbor was relat ively high and was low in Litterfall and Grass, Trees in the different organs, carbon content from high to low in turn was leaf(50.46%) > branch(49.24%)> root(48.99%) > trunk(48.17%), carbon rate in Leaf was relatively high, tr unk was lowest.⑶ Altay Larix sibirica ecosystem carbon density and carbon storage were 205.72 t·hm-2 and 131.35 Tg, the carbon storage of each component was in the order of soil(86.67 Tg)> Arbor(43.07 Tg) > Grass(1.03Tg) > Litterfall(0.56 Tg);Tianshan Picea schrenkiana ecosystem carbon density and carbon storage were 544.57 t·hm-2 and 290.84 Tg, the carbon storage of each component was in the order of soil(237.70Tg)> Arbor(52.69 Tg) > Litterfall(0.32Tg) > Grass(0.14Tg).⑷ Larix sibirica and Picea schrenkiana ecosystem were 24.19 t·hm-2 and 80.59 t·hm-2. The Spatial distribution of two mountain coniferous forest ecosystem was consistent with the environmental factors such as precipitation, temperature and conditions of soil fertility in which it is located.