INFLUENCE OF FIRE TO FOREST DYNAMICS IN PERMAFROST REGION, NORTHERN MONGOLIA

本研究的目的是调查火灾对蒙古北部落叶松森林的影响。森林火灾尤其发生在春季和秋季，森林地面上的树枝落叶堆积加剧了野火。火灾过后，再生依赖于散播的种子和由剩余成年树木密度决定的光势。因此，中等强度的火灾，再生是最活跃的。在这种情况下，森林生物量迅速恢复，但由于反复火灾后真菌的减弱而下降。1950年后，年轮的增长表明，自50年代末S以来，较小火灾的发生有所增加，与20世纪末发生的最大火灾相吻合。

The purpose of this research was to investigate the influence of fire on larch forests in northern Mongolia. Wildfires occur especially in spring and autumn intensified by the accumulation of branch shedding on the forest floor. After fire, regeneration depends on disseminated seeds and light potential determined by the density of remaining adult trees. Thus, the moderate intensity fire, regeneration is the most active. In such situation, forest biomass recovers rapidly, but decreases due to weakening of fungi after repeated fires. After 1950, tree-ring growth indicates that since the late 1950's, the occurrence of smaller has increased coinciding with the largest fire occurrences at the end of 20th century.