Research On Carbon Storage And Density Of Forest Ecosystem In Inner Mongolia

Forest carbon storage and forest carbon density in Inner Mongolia plays a significant role in the terrestrial carbon budget due to its largest forest area and forest growing stock among all the provinces in China. Our objectives were to study the Carbon sequestration of forest ecosystems and reveal its spatial distribution in Inner Mongolia. In our study, to investigate the main forest distribution area in Inner Mongolia, we set up 137 field survey samples, and conducted detailed investigation of vegetation, and soil carbon pool in each sample, and then further integrated in Forest maps to reveal various forest carbon pools size and spatial distribution of density of all regions’, which was estimated on the basis of the region’s carbon storage and composition characteristics. The results are mainly concluded as follows:(1)Inner Mongolia region’s forest ecosystem carbon reserves of 3237.39 Tg C.The highest forest carbon storage is Larix gmelinii, are 1630.32 Tg C, as follows is Betula platyphylla(718.06 Tg C)、Quercus Linn(380.27 Tg C)、Betula davurica(174.52 Tg C)、Ulmus pumila(130.11 Tg C)、Populus davidiana(99.82 Tg C)、Pinus sylvestnis var mongolica(37.24 Tg C)、Populus(36.62 Tg C)、Populus euphratica(13.92 Tg C)、Pinus tabulaeformis(8.70 Tg C) 、 Juniperus rigida(4.46 Tg C) 、 Larix principis-rupprechtii(3.26 Tg C)、Picea asperata(0.11 Tg C),accounted for 50.36%、22.18%、11.75%、5.39%、4.02%、3.08%、1.15%、1.13%、0.43%、0.27%、0.14%、0.10%and 0.003% of the total carbon storage of the forest ecosystem in Inner Mongolia.Larix gmelinii、Betula platyphylla Suk and Quercus Linn are the main body of forest carbon storage in Inner Mongolia, among which the soil, trees, litter, shrubs and herbaceous carbon stocks account for 22.76%、0.19%、0.66%、0.73% and 75.66% of the total carbon stocks. Forest carbon store in soli、trees and litter,while smaller in shrubs and herbs. The difference of carbon storage in different forest types mainly comes from the forest arae. There is a larger difference about carbon storage in different regions of forest ecosystem in Inner Mongolia. The highest forest carbon storage is Hulun Buir, which is 2270.57 Tg C, as follows is Xingan Meng(590.98 Tg C)、Chifeng(156.50 Tg C)、Tongliao(105.59 Tg C)、Xilinguole Meng(53.69 Tg C)、Hohhot(19.81 Tg C)、Alashan(13.15 Tg C)、Baotou(10.64 Tg C)、Wulanchabu(7.61 Tg C)、Bayannaoer(5.35 Tg C)、Erdos(3.53 Tg C),accounted for 70.14%、18.25%、4.83%、3.26%、1.66%、0.61%、0.41%、0.33%、0.24%、0.17% and 0.11% of the total carbon storage of the forest ecosystem in Inner Mongolia.(2)Inner Mongolia region’s forest ecosystems average carbon density is 184.49t/ha. The highest forest carbon density is Populus davidiana, which is 286.34 t/ha, as follows is Betula davurica(266.78 t/ha) 、 Larix gmelinii(266.76 t/ha) 、 Populus davidiana(223.70 t/ha)、Betula platyphylla(210.01 t/ha)、Larix principis-rupprechtii(198.32 t/ha) 、 Populus(180.27 t/ha) 、 Quercus Linn(178.64 t/ha) 、Juniperus rigida(161.04 t/ha)、Pinus sylvestnis var mongolica(132.75 t/ha)、Pinus tabulaeformis(113.55 t/ha)、 Ulmus pumila(100.39 t/ha)、 Picea asperata(79.86 t/ha).The different carbon pools for carbon density were listed in the order of from largest to smallest: the soil layer(144.42 t/ha), tree layer(35.56 t/ha), litter layer(2.94 t/ha),herb layer(1.23 t/ha), shrub layer(0.64 t/ha). Soil layer increases with the carbon density of the tree layer(P<0.05). The highest forest carbon density is Xingan Meng,as follows is Alashan、Bayannaoer、Hohhot、Erdos、Xilinguole Meng、Baotou、Hulun Buir、Chifeng、Tongliao、Wulanchabu.(3)The spatial distribution of Eastern region’s forest ecosystem carbon storage and carbon density was higher than that in western region in the overall trend.Therefore, through the establishment of protected areas, reducing human disturbance and promote plantation growth, can significantly improve the ability and potential of carbon sequestration in abundant rainfall in eastern region.