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亚马逊树木多样性的多方面的评估揭示了人类修饰的普遍影响
Erika Berenguer1,2, Cássio Alencar Nunes1,3, Jesús Aguirre-Gutiérrez2,4
1Lancaster Environment Centre, Lancaster University, Lancaster, UK.
Global change biology
|November 10, 2025
概括
砍伐和焚烧等人类活动严重减少了热带森林的多样性,影响了分类学,功能和遗传学方面. 保护未被破坏的森林至关重要,因为即使被破坏的初级森林也比二级森林保留了更多的多样性.
科学领域:
- 热带生态 热带生态
- 生物多样性科学是生物多样性的科学.
- 林业林业 林业 林业 林业
背景情况:
- 热带森林拥有地球上大多数树种,但面临着越来越多的森林砍伐和人类干扰.
- 了解对分类学,功能和遗传学多样性的影响至关重要,因为反应各不相同.
- 种类占主导地位和树木大小对森林恢复的影响还未得到充分研究.
研究的目的:
- 为了比较大和小树的分类学,功能和植物遗传多样性,在未被干扰的亚马逊森林和人类修改的亚马逊森林.
- 评估物种主导权重对多样性指标的影响.
- 评估不同类型的人类修改对森林多样性的影响.
主要方法:
- 在亚马逊东部的215个地块上采集了25,313棵大树和30070棵小树的样本.
- 在未被干扰,砍伐,砍伐和焚烧以及二级森林中的多样性指标 (分类学,功能,遗传学) 的比较.
- 应用Hill Numbers来考虑物种主导权重.
主要成果:
- 人类修改显著减少了大树和小树的所有多样性方面.
- 二级森林的α多样性最低,与未被破坏的森林差异最大.
- 分类学和功能多样性对人类的影响同样敏感; 基因多样性对α-多样性不那么敏感,但对社区组成同样敏感.
结论:
- 人类修饰是亚马逊森林多样性丧失的主要驱动因素,解释了阿尔法多样性和社区组成的大量变化.
- 保护剩余的未被破坏的森林免受伐木和火灾是必不可少的.
- 受到破坏的原始森林比二级森林保持更高的多样性,这突显了对退化地区的保护努力的重要性.
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