The Influence Of Vegetation Restoration On Carbon Storage Of Burned Area In Greater Xing’an Mountains

In this paper, we selected the burned area after "87fire" in Hongqi forestry centre of Amuer forestry bureau in Greater Xing’an Mountains as research platform. Biomass of the forest ecosystems was obtained through total harvesting method and average sample tree determination method. Through dry combustion method, we measured the carbon content rate of tree, shrub layer, herb layer, litter and soil layer of the stands. From the perspective of forest types and restoration years, total carbon storage of the whole forest ecosystems of Larix gmelini plantation, Pinus sylvestris var.mongolica plantation and Betula platyphlla natural forests in this area was estimated. We explored the carbon sink capacity of different forest ecosystems. Furthermore, the influence of restoration years on the carbon sink capacity of Larix gmelini plantation was researched. The results showed that:(l)As to different forest types, carbon content rate of each layer of Larix gmelini plantation, Pinus sylvestris var.mongolica plantation and Betula platyphlla natural forest was: Larix gmelini plantation:shrub layer (45.80%)> litter layer (45.29%)> tree (44.33%)> herb layer (33.62%)> soil layer (6.05%). Pinus sylvestris var.mongolica plantation and Betula platyphlla natural forest showed:shrub layer>tree> litter layer>herb layer> soil layer. The carbon content rate of different vegetation layers and litter layer among each forest types showed:Z> L> T, while the soil layer was L> T> Z. With the increase of restoration years, the carbon content rate of different vegetation layers and litter layer increased firstly then decreased. However, the soil layer decreased firstly then increased.(2)The total biomass of Larix gmelini plantation, Pinus sylvestris var.mongolica plantation and Betula platyphlla natural forest ecosystems were123.90t/hm2,55.61t/hm2and55.20t/hm.The total biomass of Larix gmelini plantation, Pinus sylvestris var.mongolica plantation ecosystems showed:tree>litter layer>shrub layer> herb layer. While the total biomass of Betula platyphlla natural forest ecosystem showed:tree>shrub layer> litter layer herb layer. The total biomass of Larix gmelini plantation grew with the increase of restoration years.(3)Total carbon storage of three kinds of forest ecosystems showed:Larix gmelini plantation (181.9019t/hm2)> Betula platyphlla natural forest (140.1149t/hm2)>Pinus sylvestris var.mongolica plantation (81.1855t/hm2).Contribution rate of each layers of forest ecosystem was soil layer> forest vegetation layer> litter layer.(4)Among Larix gmelini plantation of different restoration years in this burned area, total carbon storage of forest ecosystem grew with the increase of restoration years. The value of total carbon storage of forest ecosystem restored in1989was181.9019t/hm2. It was the largest among these Larix gmelini plantation, furthermore, it was4.65times of the smallest plantation. With the increase of restoration years, artificial regeneration stands in this burned area improved more significantly than natural regeneration stands.