【摘要】 对澜沧江中下游糯扎渡水电站工程枢纽区和库区内篦齿苏铁的生境、种群结构进行调查研究。结果表明,篦齿苏铁在澜沧江干流的两岸分布不均匀,右岸占48.37%,左岸占4.26%,支流占46.37%;主要生长在落叶季雨林下,以半阴半阳坡较多,占总株数401株的47.85%。调查区域内篦齿苏铁种群密度很低,平均约1株/hm2。由于人为采挖严重,导致其种群大小级结构不完整,成年个体较少,缺乏Ⅲ级个体,以Ⅰ级、Ⅱ级幼小个体较多,占32.21%。种群内开花结实植株少,仅发现5株开花,2株结实,但其单株自然结实率较高。目前该种群面临的威胁有:人为采挖;人类生产和建设活动使其生境丧失及生境退化严重;啮齿动物的啃食。使该区域苏铁种群密度急剧减小的主要原因是各种人为干扰,而非自然因素。指出应加大对篦齿苏铁野生资源的调查和保护力度,就地保护和迁地保护相结合,并开展人工繁殖、遗传多样性和生理生态方面的研究,以便更加科学、合理地制定其保护措施。更多还原

【Abstract】 The investigation on the habitat,population structure of Cycas pectinata Griff.was carried out at the reservoir and junction area of Nuozhadu Hydropower on the middle and lower reaches of the Lancang River.The results demonstrated that the distribution of Cycas pectinata Griff.was inhomogeneous with 48.37% on the right bank,4.26% on the left and 46.37% at tributary.It grew in the deciduous monsoon forest,where 47.85% of the total 401 were found at the southern and northern slopes.In the investigation area the population density was rather low,about 1 per hectare.Due to the serious destruction by men,the population structure was unstable with the less mature trees,especially lacking of the plant of Ⅲ grade,and more juvenal trees of Ⅰ and Ⅱ grades with 32.21%.It was also found that the plant of blooming and seeding was very few with only 5 blooming and 2 seeding in the population.But the spikelet fertility was high.At present the population confronted many threats: human collection;on the other hand,its habitat was seriously destroyed and degraded because of human production and occupying area of projects;furthermore,it was effected by rodent.Based on the material and information collected,the author considers the man-made interference,rather than natural factors,the major reason of density declining.Therefore the investigation and the protection should be strengthened and the relative researches should also be operated for the protection.更多还原