摘要
采用由植被空间序列推断时间系列的方法 ,分析大兴安岭呼中林区近 2 0年来不同火烧迹地植被变化情况。结果表明 ,森林火后初始 ,植物尤其是草本物种迅速增多 ,火烧迹地的植被主要由草本所占据 ,但随着时间的推移 ,草本物种不仅在数量上有明显减少 ,在物种组成上有很大的变化 ,而且盖度也逐渐减少。灌木及乔木物种由于种类较少 ,在种类及组成上演替初期变化不如草本明显 ,但是盖度却逐渐增多。在本地区火后植被次生演替过程中 ,高频物种所占的比例较高且呈上升趋势 ,这明显有悖于Raunkiaer频度定律关于在相对稳定的群落中高频物种所占的比例应相对较低的规律。另外 ,不同火烧迹地间灌木的物种相似度明显高于草本的物种相似度 ,火烧年份相近的火烧迹地上的草本物种相似度要明显高于火烧年份远的草本物种相似度 ,但灌木间的物种相似度却没有出现这种现象 ,没有明显的规律。
With method of deducing time series from spatial series for vegetation succession,we analyzed the vegetational dynamics in Huzhong burned area of Daxinganling in recent 20 years.The results showed that the number of species,especially herbs,increased rapidly in the burned area soon after fire.But as time went on,the number of herbs decreased obviously,with great composition change,and coverage declination.Conversely,the coverage of shrubs and trees increased gradually,but the number of species and composition did not vary significantly.Throughout succession,the ratio of high frequency species was high and increasing,which did not obviously conform to Raunkiaer’s law of frequency that the ratio of high frequency species was low in relatively steady communities.In addition,the similarities of shrubs in different burned areas were higher than those of herbs.The similarities of herbs in the burned area of close years were higher than those in the burned area of distant years.There was no obvious rule among the similarities of shrub species in the burned area of various years.
出处
《生态学杂志》
CAS
CSCD
北大核心
2004年第5期35-41,共7页
Chinese Journal of Ecology
基金
国家自然科学基金 ( 3 0 2 70 2 2 5
40 3 3 10 0 8)
中国科学院知识创新资助项目 (SZY0 10 2 )
关键词
大兴安岭
火烧迹地
演替
Daxinganling,burned area,succession.[GK-10*4!-1]
