The Forest Carbon Storage Temporal And Spatial Analysis Of Main Forest Types In Huanglong Mountain Based On GIS

In recent years, the sharply decline of forests, land degradation, pollution, biodiversity loss, especially human activities have dramatically increased the concentration of CO2 and the greenhouse effect has been the most serious global environmental problem. So the global carbon cycle research increases universal concern. In order to assess the forests in the global carbon balance and understand the forest ecosystems in the role of the carbon cycle correctly, a more detailed study on forest carbon dynamics hms increasingly becoming the focus of attentions. To meet the demands, the article takes the Caijiachuan Forestry Farm of Huanglong Mountain Forestry Bureau in northern Shaanxi as an example. Based on field investigation and forest resource investigate data of 1986, 1997 and 2004, spatial analysis with GIS and varies of statistical methods were used to examine forest biomass / carbon stocks in the dynamic changes of time and space in Caijiachuan Forestry Farm. The main conclusions were as follows:(1) Based on forest resource investigation data, the distribution map of forest carbon stocks in 1986, 1997 and 2004 was produced and the forest biomass, the total carbon reserves and the changes in the density of carbon were researched. The study area average carbon density was 18.53t.hm-2 in 1986 and 17.95 t.hm-2 in 1997 and rose to 25.7 t.hm-2 in 2004. It had an uniform distribution of carbon gradually, but was far below the national average. So there is still great growth potential in forest carbon storage.(2) The area of dominant species and the changes of age groups are closely related to carbon stock changes. As the increase of Chinese pine area, carbon stocks also increased in the three periods. Although the oak area in the three periods changes little, as the trees grow, the total carbon reserves continued to increase. Shaws and other species have a smaller size (0.3%) and have a smaller contribution to the total carbon reserves correspondingly. The area of young-aged forest was 1.5% -1.8% of the total forest study area in the three periods, the corresponding carbon reserves was also low, only of 0.4% -1.4% the total carbon reserves. The area of the middle-aged forest and near-mature forest was larger in different periods, its proportion was as high as 52% -87%.The area of mature forest and overmature forest was also larger and had an important role in the whole accumulated carbon reserves, too.(3) Based on spatial analysis functions of GIS, the distribution map of age groups and distribution map of dominant species in different periods were converged with the carbon reserves distribution maps in 1986, 1997 and 2004 respectively. So the dominant species distribution map of carbon stock changes and age groups distribution map of carbon stock were got. Meanwhile, in order to get each age group's carbon stock changes of each dominant species, carbon stock distribution map, dominant species distribution map and age groups distribution map in 1986, 1997 and 2004 were converged.