作　　者： ; ; ; ; ; (李昌龙）;

机构地区： 西北师范大学生命科学学院

出　　处： 《西北植物学报》 2005年第8期1628-1636,共9页

摘　　要： 通过重要值、分布格局、年龄结构、静态生命曲线等方法研究了连古城自然保护区5种群落优势种群数量在时间上和空间上的变化趋势.研究结果表明:灌木荒漠群落中,优势种群或共优种群的重要值远远大于亚优势种群,在维持群落结构和功能方面占据十分重要的地位.除红砂群落外,其它类型的群落中,都具有相同的亚优势种群,即泡泡刺种群,表明泡泡刺种群具有较宽的生态幅是比较古老的种群,其它类型的种群是在这一种群基础上发展起来的.优势种群的分布格局由种群生物学特性和环境条件等诸多因子共同决定,膜果麻黄和绵刺种群呈集群分布,而其它种群呈随机分布.优势种群的年龄结构和静态生命曲线均呈现多样化,膜果麻黄、猫头刺和甘蒙锦鸡儿种群年龄结构为增长型锥体,静态生命曲线为凹型下降,均为稳定种群;绵刺种群的年龄结构为下降型锥体,静态生命曲线为反对角线型上升,但其营养繁殖策略决定了绵刺种群为稳定种群;珍珠猪毛菜种群年龄结构在整体上为稳定型锥体,但局部表现为下降型锥体,种群开始衰败,静态生命曲线为正态分布型;红砂种群的年龄结构为下降型锥体,静态生命曲线残缺并有许多空白区,种群严重退化. The spatial and temporal trends of the community numbers of five dominant species in Minqin Liangucheng Nature Reserve were studied in terms of their importance values, distribution patterns, age structures, and static life curves. The results indicated that in the desert shrub communities, the dominant species or co-dominant species presented a much higher importance value than subdominant species did thereby playing a very important role in maintaining the structures and functions of the communities. There were a subdominant communities, i. e. Nitraria sphaerocarpa communities, which commonly existed in all the communities but Reaumuria soongorica community, and this indicated that Nitraria sphaerocarpa community, as an ancient community, had a wide ecological range and the other communities evolved from Nitraria sphaerocarpa community, the distribution patterns of the dominant communities depended up many factors such as biological characteristics and environmental conditions, which made Ephedra Przewalskii and Potaninia mongolica communities present a clump distribution and the other ones present a Poisson distribution. The dominant communities appeared to be diverse in age structure and static life curve. Ephedra Przewalskii, Caragana opulens and Oxytropis aciphylla communities, appearing to be a cone-shape of growth in age structure and a concave decline in static life cure, were stable communities; Potaninia mongolica community presented an inversed cone shape of growth in age structure and a back-di-agonal increase in static life curve, but its reproduction strategy determined it as a stable community; Salsola passerina community generally showed a stable cone shape of growth in age structure except partially appeared an inversed cone shape of growth thus beginning to decline, and it displayed a normal distribution in static life curve; Reaumuria soongorica community presented a inversed cone shape of growth in age structure and an incomplete shape if static life curve in many cases, which indicated that

关 键 词： 连古城自然保护区 优势种群 分布格局 种群结构 静态生命曲线

领　　域： [生物学]