森林马赛克,而不是草原走廊,在最后的冰川最大期期间在东南亚占主导地位
Rebecca Hamilton1,2,3,4, Noel Amano2, Corey J A Bradshaw4,5
1isoTROPIC Research Group, Max Planck Institute of Geoanthropology, Jena 07745, Germany.
概括
东南亚的热带森林表现出对气候变化的弹性,而不是在最后的冰川最大期 (LGM) 期间广泛的"沙漠化". 生态系统抵抗和恢复,表明适应过去的气候压力因素的能力.
科学领域:
- 古生态学 古生态学
- 气候科学 气候科学
- 生物地理学 生物地理学 生物地理学
背景情况:
- 主要观点认为,在最后的冰川最大期 (LGM) 期间",沙原走廊"取代了东南亚雨林,影响了气候变化抵御力和人类迁移模型.
- 这种解释表明,在未来的气候变化情景下,热带森林很容易受到"沙文化"的影响.
- 目前还没有对这条走廊的古生态证据进行全面的多代理重新审查.
研究的目的:
- 在东南亚实证测试LGM沙文化的证据.
- 澄清古生态方法,生物地理和从119000年前到现在的区域生态变化之间的关系.
- 评估东南亚生态系统对气候压力因素的弹性.
主要方法:
- 在东南亚地区对59个古生态记录进行了定性和统计分析.
- 检查花粉记录和C生物标志物代理.
- 对花粉和生物标志物数据之间的差异进行调和.
主要成果:
- 花粉记录表明在LGM期间山林的持续存在,而C生物标志物表明C4草原的扩张.
- 一个调和这一点的假设是高地山林的扩张和低地季节性干旱的热带森林.
- 从34000年前到2000年前,森林的平稳过渡表明了生态系统的抵抗力和恢复能力.
- 生态变化表明,大约3万年前,LGM在东南亚的早期出现.
结论:
- 东南亚的生态系统表现出对气候压力因素的弹性,抵御和恢复变化,从而挑战了"野原化"的脆弱性.
- 这些发现表明,对LGM条件的生态反应比以前假设的要复杂得多.
- 该研究提供了关于热带森林生态系统对气候变化的长期适应能力的关键见解.
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