| Global climate change has already become the most serious environment problems confronted by the human beings. The forest ecosystem, as the main terrestrial ecosystem, is playing a very important role in the global carbon balance, and therefore the research on carbon storage and carbon density has gradually turned to be one of the hot areas in the research on carbon balance of the ecosystem.Mt. Helan in Ningxia Province, located in the junction area of temperate grass area and steppelike desert, is typical temperate forest ecosystem in arid zones of Northwest China. The research and analysis on the carbon storage and carbon density of Chinese Pine (Pinus tabulaeformis), which is the main dominant specie in the forest region of Mt. Helan, is of great significance on evaluating the function of carbon sink of this area. In this paper, focused on nature Chinese Pine (Pinus tabulaeformis) of Mt. Helan, the biomass conversion factors, the model of relationship between biomass and volume, the features of carbon storage and carbon density were investigated. The results showed that:1. Based on the investigation date of 12 standard sample field, the biomass conversion factors of Chinese Pine in Mt. Helan has been calculated. The result showed that the biomass conversion factors of Chinese Pine in Mt. Helan moved between 0.77 and 1.39 with the average value 0.89;2. The curve fitting analysis and correlation equation on the aboveground biomass and volume of Chinese Pine in Mt. Helan, showed that the biomass of Chinese pine forests in Mt. Helan increased as the volume increasing, the related coefficient of which had reached 0.9874, therefore it would be credible to estimate the aboveground biomass of Chinese Pine forests of this area utilizing the equation;3. There are certain correlations between the biomass of each organ and the volume of Chinese Pine in Mt. Helan, in which the related coefficient of the stem biomass and volume is 0.9722 and the branch biomass and volume is 0.9402 respectively. And there are also some correlations between bark biomass, leaf biomass and volume;4. Based on the Mt. Helan forest inventory, associated with the biomass volume equation, the carbon storage and carbon density of natural Chinese Pine forest in Mt. Helan was estimated, which showed that:1) The carbon storage of Chinese Pine of Mt. Helan in Ningxia was 11.7262×104t, in which the middle-aged forest carbon storage is 0.1371×104t, only 0.12% of total carbon storage; the nearly mature forest carbon storage is 11.5891×104t, about 98.8% of total carbon storage. The carbon densities of the middle-aged forest and nearly mature forest are 36.46t/hm2, 33.44t/hm2 respectively. The carbon density increases with stand age increasing.2) From the spatial distribution of carbon storage of Chinese Pine forest, Dashuigou is 3.9726×104t, Suyukou is 7.7358×104t (66.0% of total carbon storage) and Maliankou is 0.0181×104t (only 0.2% of total carbon storage); however, the carbon density of Maliankou is the most significant among the three areas, which is 39.31t/hm2, followed by Suyukou and Dashuigou.3) For the carbon storage of each part of the trees, either in a different stand age or different area, both carbon storage and carbon density in stem are with the largest proportion, the order for the carbon storage is stem> branch> leaves > bark.5. The correlation analysis between different tree-measurement factors, ecological factors and carbon storage showed that the tree height (H) and diameter at breast height (DBH) impact on the carbon storage mostly with significant correlation relationship. The differences significant analysis of the factors- stand age, stand density, H, DBH, canopy density and sloping, on the carbon storage showed that stand age DBH and H impact significantly on the carbon storage of Chinese Pine forest of Mt. Helan in Ningxia, and among those ecological factors, canopy density and sloping impact on the carbon storage insignificantly. |
PDF Full Text Request