随着人类持续干扰的多样性丧失,增加了对生态系统崩的脆弱性
A S MacDougall1, K S McCann, G Gellner
1Department of Integrative Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada. amacdo02@uoguelph.ca
Nature
|February 8, 2013
概括
人类干扰降低了生态系统的多样性和稳定性,造成了隐藏的脆弱性. 恢复生物多样性对于生态系统的弹性和防止崩至关重要,特别是在火灾等干扰后.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 保护生物学 保护生物学
背景情况:
- 人类的干扰改变了生态系统,减少了多样性和功能属性,如抗入侵.
- 理论预测表明,多样性丧失增加了生态系统崩的风险,但经验证据很少.
研究的目的:
- 研究人类干扰对草原生态系统稳定性和多样性的长期影响.
- 为了证明生物多样性丧失,生态系统功能和易受崩的影响之间的联系.
主要方法:
- 分析一个退化的燃烧性草原生态系统,受火灾灭火和物种丧失的影响.
- 在不同的干扰制度下比较生态系统功能 (生产力,弹性,抗入侵能力).
- 评估生态系统对火灾重新引入的反应,与剩余的本地物种多样性相关.
主要成果:
- 灭火导致物种丧失,但增加了生产力和抗入侵能力,与理论相反.
- 生物多样性的丧失创造了一个隐藏的脆弱性,在火灾重新引入时崩.
- 剩余的本地物种促进了草原的持续性,并防止了火灾后的林地转换.
结论:
- 人类干扰导致的生物多样性丧失,可以创造出看似稳定的,但脆弱的生态系统.
- 高的物种多样性对生态系统的稳定性和弹性至关重要,提供了关键的缓冲效应.
- 保护生物多样性对于维持生态系统功能和防止不可逆转的崩至关重要.
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