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OALib Journal期刊
ISSN: 2333-9721
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庞泉沟自然保护区华北落叶松种群生命表与谱分析
DOI: 10.3724/SP.J.1145.2010.00001, PP. 1-6
Keywords: 华北落叶松,种群生命表,谱分析,种群动态,庞泉沟自然保护区
Abstract:
以种群生命表及生存分析理论为基础，将林木依胸径大小分级，以林木径级结构代表年龄结构，采用分段匀滑技术，编制庞泉沟自然保护区华北落叶松种群特定时间生命表，绘制死亡率曲线、消失率曲线、存活曲线、生存函数曲线，分析种群数量特征；同时结合谱分析方法，分析华北落叶松种群数量的动态变化.结果表明：（1）华北落叶松种群年龄结构表现为稳定型，但林下幼苗、幼树相对较少.（2）华北落叶松种群死亡率和消失率曲线变化趋势基本一致,均出现两个高峰,一个出现在第11、12龄级阶段，另一个出现在第15龄级阶段；存活曲线趋于deevey-ⅱ型.（3）4个生存函数曲线表明，华北落叶松种群具有前期稳定、中后期锐减和末期衰退的特点.（4）种群动态的谱分析显示，华北落叶松种群动态除受基波影响外，还存在着明显的小周期波动，在第7龄级这一小周期波动与华北落叶松的高生长有关；在15龄级这一小周期波动与华北落叶松进入生理衰退期有关.图5表3参28
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