内蒙古森林固碳动态变化

Dynamic Change of Carbon Fixation in Forest in Inner Mongolia

根据森林资源的连续调查资料，利用生物因子法计算了内蒙古森林固碳量及其变化规律。结果表明：内蒙古森林总固碳量从1949年的4．17亿t逐渐增加到7．19亿t。同时灌木林固碳量从最初的43．95万t增加到1379．84万t，增加了31．4倍。内蒙古森林资源年净固碳量在284．2—522．6万t之间，并有逐渐降低的趋势，而同期森林资源的年均枯损消耗流失碳的数量却呈现出增加的趋势。内蒙古森林平均碳密度为42．68t／hm^2，并且1980年以前内蒙古森林碳密度呈现逐渐降低的趋势，1980年以后内蒙古森林碳密度变化基本处于平缓增加的变化过程，森林平均碳密度有所改善。

Based on the continuous survey on forest resources, the amount of carbon fixation and its changing regularity have been calculated by use of biological factors method. The results show that in Inner Mongolia, the total amount of carbon fixation in forest has gradually risen to 719 millions tons from 417 millions tons in 1949. Meantimes, the amount of carbon fixation in shrubs has risen to 13. 7984 millions tons from original 439. 5 thousands tons, with increased by 31.4 times. The annual net amount of carbon fixation in forest resources is between 2. 842 millions to 5.226 millions tons, with a tendency of gradually decreasing. However, at the same period, the annual average amount of consuming and losing carbon in forest resources is in an increasing tendency. The average carbon density of forest in Inner Mongolia is 42.68 tons/hm^2. And in Inner Mongolia, before 1980 the carbon density of forest presented a tendency of gradually decreasing, but after 1980 it was in a process of gently increasing. The average carbon density of forest has improved.