净月潭国家级森林公园樟子松生长状况的调查与分析

以长春市净月潭国家级森林公园樟子松人工林为对象,选取不同生长状况的样株制取胸径圆盘进行年轮测定,分析引起大树针叶枯黄、个体死亡的因素,结果表明:林分不同密度或相同密度的植株,不同年份胸径年轮生长量与健康状况存在显著差异,幼龄林和中龄林前期胸径年轮生长十分旺盛,而在中龄林的中后期则生长缓慢,部分年份年轮宽度显著变窄,呈现不规则变化。有大树针叶枯黄、个体死亡现象发生,林分密度大、郁闭度高、林龄大尤为严重;导致针叶枯黄和个体死亡的可能因素有个体的遗传性差异、个别年份的生理干旱、林分密度过大引起光合产物制造与积累受阻、立地环境不适或不良气候胁迫等。

Investigation and analysis of growth condition of Pinus sylvestnis var. mongolica Litv.in Jingyuetan national forest park

Pinus sylvestnis var.mongolica Litv.planted in Jingyuetan national forest park of Changchun was taken as ob-ject, annual ring measurement of diameter disc with different growth condition was taken to analyze the reason of turing yellow of needles of big trees and individual death , results indicated that there was significant difference between diameter annual ring increment and physical condition in different density or the same density plants ;growth of young forest and ear-lier middle frosty were very vigorous , whereas in the end of middle forestry , growth was slowly , some of annual ring width was significantly narrow down , showing irregular variation .Turing yellow of needles of big trees and individual death were observed, especially in bigger stand density , higher canopy density and older stand age ones .Following possible factors caused the phenomenon ：genetic differences of individual , physiological drought in some years , obstruction of photosyn-thate manufacturing and accumulation caused by bigger stand density , inadaptable site environment or climate stress .