摘要
为研究千岛湖马尾松(Pinus massoniana)种群动态变化,在姥山岛上设置面积为5.76 hm2的固定样地,进行群落学调查。根据野外调查的数据,对马尾松种群的结构和分布格局进行分析。结果表明:马尾松种群1、2级个体数极少,仅占样地中马尾松个体数的0.06%和1.01%,幼苗、幼树储备严重不足,5级个体的比例最高,达到28.28%,马尾松种群径级结构为纺锤型;马尾松种群的存活曲线为凸型。这些均表明马尾松种群的年龄结构趋向衰退型。但马尾松种群中树个体很多,在较长的时期内马尾松还不会退出群落。马尾松种群静态生命表也可看出中一些小型径级的死亡率为负值,也说明马尾松种群幼苗严重缺乏,种群呈衰退趋势。马尾松种群各径级和总体的分布格局均呈聚集分布,从小树→中树→大树聚集指数逐渐减小,种群呈扩散趋势。
To study the dynamics of Pinus massoniana population of the secondary forest,a sample plot（240 m×240 m） was set on Laoshan island of Qiandao Lake Region.All trees were tagged and measured to analyze the population structure and spatial distribution patterns.The individuals at 1st and 2nd age size were few,accounted for 0.06% and 1.01% of total,respectively.The juvenile individuals were severely lacking.The individuals at 5th age size were the dominant,and accounted for 28.28% of total.The spindle type population structure and convex curve survivorship suggested the population was stable with a declining trend.But the population would not be withdrawn from the community in a short time because there were a large number of medium size class individuals.The negative mortality of the small size classes indicated the seedlings were severely deficient and the population tended to decline in a long time.The spatial distribution pattern of total individuals or individuals at different size classes of P.massoniana presented clumping distribution.Aggregation index of the population was declining from saplings,medium size trees to mature trees.Totally,the population would diffuse in trend.
出处
《植物研究》
CAS
CSCD
北大核心
2010年第5期537-542,共6页
Bulletin of Botanical Research
基金
浙江省自然科学基金项目(Y507660)
关键词
马尾松
种群结构
静态生命表
存活曲线
分布格局
Pinus massoniana
population structure
static life table
survivorship curve
distribution pattern
