呼伦贝尔市森林碳储量动态变化特征

利用呼伦贝尔市《内蒙古自治区森林资源统计年报》资料,依据不同森林类型生物量和蓄积量之间的回归方程,估算了呼伦贝尔市Ⅲ期(1984年)、Ⅴ期(1995年)、Ⅶ期(2008年)的森林生物量、碳储量、碳密度,并分析其动态变化特征。结果表明,第Ⅲ期到第Ⅶ期呼伦贝尔市天然林面积由961.39万hm~2下降至341.72万hm~2,蓄积量由78 053.37万m~3下降到24 392.02万m~3;人工林面积由10.47万hm~2增加到26.47万hm~2,蓄积量由221.87万m~3增加到1 308.55万m~3。第Ⅲ期到第Ⅶ期呼伦贝尔市天然林碳储量呈下降趋势,由2 277.91 TgC减少到637.47 TgC;人工林碳储量呈现上升趋势,由58.01 TgC增长到404.54 TgC。不同森林类型碳储量变化趋势与森林面积变化呈正相关关系。幼龄林的面积和碳储量最大,森林的年龄结构以幼龄林、中龄林为主。随着时间推移,成熟林所占比例不断增大,碳储量和碳密度随之增加。各林型和不同龄级碳密度值在整体上呈现增加趋势。

Dynamic Characteristics Forest Carbon Storage Dynamics in Hulunbuir City

Making use of the annual report of the Inner Mongolia Autonomous Region Forest resources in Hulunbuir,based on the regression equation between biomass and stock of different forest types, the forest biomass, carbon storage, and carbon density in the phase Ⅲ(in 1984), phaseⅤ(1995) and phase Ⅶ(2008) of Hulunbuir City were estimated, and its dynamic characteristics was analyzed.The results showed that according to the phaseⅢ checked to the phase Ⅶ, the area of natural forest in Hulunbuir City has decreased from 9.613 9 million hm2 to 3.417 2 million hm2, volume decreased from 780.533 7 million m3 to 243.920 2 millionm m3.Plantation area increased from 0.104 7 million hm2 to 0.264 7 million hm2;volume increased from 2.2187 million m3 to 13.0855 million m3.According to the phaseⅢ checked to the phase Ⅶ, Hulunbuir natural forest carbon storage showed a downward trend from 2 277.91 TgC reduced to 637.47 TgC.Plantation area carbon storage showed an upward trend, from 58.01 TgC to 404.54 TgC.There was a positive correlation between the change trend of carbon storage and the change of forest area.The area of the young forest and the carbon storage are the largest, and the age structure of the forest is dominated by young forest and middle age forest.Over time, due to the change in the age structure of the forest, the increasing proportion of mature forests, and with the increase in carbon storage and carbon density.The carbon density of each forest type and different age showed an increasing trend as a whole.