在过去的几千年里,马达加斯加北部的山地雨林在气候变化和人类影响下的动态变化
Vincent Montade1,2, Laurent Bremond1, Helena Teixeira3,4
1ISEM, University of Montpellier, CNRS, IRD, EPHE, PSL Research University, Montpellier, France.
Royal Society open science
|August 22, 2024
概括
大约1100年前人类抵达马达加斯加,与一场严重的干旱相吻合,对生态系统产生了重大影响. 气候变化和人类活动都导致了热带雨林和野生动物种群的变化.
科学领域:
- 古生态学 古生态学
- 环境历史 环境历史
- 气候科学 气候科学
背景情况:
- 马达加斯加的生态系统显示了人类显著改变的证据.
- 人类到达的确切时间和它们对环境影响的程度仍然不清楚.
- 了解过去的环境变化对于保护马达加斯加独特的生物多样性至关重要.
研究的目的:
- 调查早期人类影响和气候变化对马达加斯加北部热带雨林和野生动物在过去几千年的影响.
- 区分自然气候驱动的变化和对马达加斯加生态系统的人为影响.
- 使用多个代理数据重建该地区的环境历史.
主要方法:
- 从马达加斯加北部的山地环境中分析湖泊沉积物核心.
- 通过沉积物分析识别植被变化和火灾事件.
- 对物种人口史的审查,以评估数千年来人口动态.
主要成果:
- 大约1100年前,发生了显著的植被变化和严重的干旱.
- 人类影响的证据,火灾表明,大约在同一时间开始,但在直接的湖泊流域之外.
- 末期Holocene干旱显著影响生态系统独立于人类活动.
- 在过去的几千年里,大量物种经历了人口瓶.
结论:
- 自然气候变化 (干旱) 和人类活动都在塑造马达加斯加生态系统方面发挥了重要作用.
- 环境变化很可能是由后期Holocene干旱和人类影响的结合驱动的.
- 多站点和多代理方法对于理解复杂的环境历史和继承是必不可少的.
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