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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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濒危兰科植物流苏石斛的种群数量动态
DOI: 10.3724/SP.J.1145.2012.00565, PP. 565-570
Keywords: 种群动态,leslie矩阵模型,濒危植物,兰科,流苏石斛,西双版纳
Abstract:
运用静态生命表、生殖力表和leslie矩阵模型，研究了云南西双版纳地区流苏石斛两个种群――a种群（21°58′n，101°13′e，保护区之外）和b种群（21°54′n，101°17′e，保护区内）的种群数量动态.结果表明：种群存活曲线表现为deevey-?型.a、b种群均表现出幼龄个体死亡率高，中龄级个体数量少，说明中龄阶段曾受到较大的人为干扰.种群的净增长率（ro）、内禀增长率（rm）和周限增长率（λ）都较低，表现为衰退种群，leslie矩阵模型分析表明在未来25年种群各龄级的个体数及种群总数均表现出持续下降趋势.种群下降可能是由于当地人为的采挖和严重的生境破碎化所导致.图2表4参16
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