小寨子沟自然保护区领春木种群数量特征与空间分布格局  

Quantitative Characteristics and Spatial Distribution Patterns of Euptelea pleiospermum Populations in Xiaozhaizigou Nature Reserve

作　　者：姬慧娟[1] 陈思多[1] 马文宝[1] 何建社[2] 张利[2] 刘兴良[1] 

机构地区：[1]四川省林业科学研究院,四川成都610081 [2]阿坝州科学技术研究院,四川汶川623000

出　　处：《四川林业科技》2013年第6期1-7,共7页Journal of Sichuan Forestry Science and Technology

基　　金：林业公益性行业科研专项(201104109);"四川地震灾区灾后植被恢复及可持续发展关键技术研究与示范"和北川大熊猫等保护及栖息地恢复试验研究-珍稀濒危植物种子保育策略研究

摘　　要：领春木(Euptelea pleiospermum)是东亚特有珍稀濒危植物,在北川小寨子沟自然保护区主要沿河岸分布。本文采用样方法,从种群的大小级结构、静态生命表、存活曲线、空间分布格局4个方面分析了该自然保护区领春木种群的数量特征与空间分布格局。结果表明:1)幼龄期个体很少,中龄期个体相对较多,老龄期个体数量也很稀少。由此可知其大小级结构呈纺锤形,因此种群属于衰退型;2)I、II级个体数少,致使其在静态生命表中死亡率出现负值,个体在第Ⅳ级有一个死亡率高峰,而在第Ⅶ级死亡率达到了最高;3)虽然幼苗的存活率很低,但由于幼树的存活率较高,所以存活曲线接近Deevey I型,表明该地区沿河岸带的环境条件比较适合领春木的生长;4)种群空间分布格局为聚集分布。为了保护和维持种群,应对群落进行适度的干扰,开辟林窗,促进领春木种子萌发,幼苗和幼树正常生长。E. pleiospermum, an endangered tree species endemic in East Asia, is mainly scattered in the ri- parian zone in Xiaozhaizigou Nature Reserve. In order to discover the causes of its concentrated distribu- tion and maintaining mechanism in this area, by adopting the method of quadrat method, from the size of the population structure, static life table, survival curve, and space distribution pattern data, studies were made of its quantitative characteristic and spatial distribution pattern. The results showed that： 1 ） both its individual number in the young-age period was few, relatively many in the mid-age period, and also very rare in the old age period. This spindle-like structure displayed that the size of its population belonged to the recession type; 2）Existing grade I and 11 had very few individual number, thus th tatity in the static life table of the level I and 1I was negative,the individual mortality the grade IV ,and reached the highest level in the grade VII; 3 ） Although the seedling e individual mor- peak ap survival peared in rate was low, but its sapling survival rate was higher, therefore the survival curve was close to Deevey type I This indicated that E. pleiospermun easily survived in this area; 4） The spatial distribution pattern of its popu- lation was an aggregation distribution and its trend was consistent with the most rare plant species. Some population protection measures were recommended, such as moderately disturbing community, appropriate- ly enlarging the gap size. These measures would promote its seed germination, normal development of its seedlings and saplings, and the individual~ natural diffusion as well.

关 键 词：领春木 数量特征 空间分布格局 小寨子沟自然保护区 

分 类 号：Q948[生物学—植物学]