长期树木种群增长可以预测树木侵占模式
Robert K Shriver1, Elise Pletcher1, Franco Biondi1
1Department of Natural Resources and Environmental Science, University of Nevada, Reno, NV 89557.
概括
干旱地区的木材侵占可能不仅仅是由于人类活动. 一项元分析表明,长期的人口增长,而不仅仅是定居点效应,解释了树木密度的增加.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 林业林业 林业 林业 林业
背景情况:
- 干旱地区的木材侵占通常归因于土地利用变化和全球趋势.
- 将这些因素与木质侵占联系在一起的证据是混合的,潜在的过程仍然不清楚.
研究的目的:
- 澄清人口统计过程在木质植物丰度变化中的作用.
- 为了调查美国西部森林中木材侵占的驱动因素.
主要方法:
- 对29个森林种群的树木年龄结构进行了元分析.
- 使用人口模型,估计了几个世纪以来人均树木建立率.
主要成果:
- 发现有限的证据表明,在19世纪定居之后,树木建立率增加.
- 观察到的年龄结构可以通过稳定人口增长模型来预测.
- 上个世纪树木种植率有所下降,达到历史最低点.
结论:
- 长期的人口增加,而不仅仅是人为因素,可能是现代木材侵占的驱动因素.
- 在不考虑人口统计过程的情况下,对摊位结构的结算影响的高估可能会发生.
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