在夏威夷,侵袭性草原占主导地位,能够抵御干扰
Stephanie Yelenik1,2, Eli Rose1, Susan Cordell3
1U.S. Geological Survey Pacific Island Ecosystem Research Station Hawai'i National Park Hawaii USA.
Ecology and evolution
|March 21, 2024
概括
夏威夷入侵草原的干扰揭示了有弹性的本地和入侵植物群落. 居民物种的相互作用和种子的可用性严重影响干扰后的恢复,保持稳定的状态.
科学领域:
- 生态生态学 生态生态学
- 恢复生态学 恢复生态学
- 植物社区动态 植物社区动态
背景情况:
- 非原生植物的入侵和日益严重的破坏,在全球范围内重塑了景观.
- 在干扰后预测植物社区的组合是具有挑战性的,特别是在被入侵的生态系统中.
- 了解这些动态对于管理人类影响的地区至关重要,比如夏威夷的干旱地区,放牧景观.
研究的目的:
- 调查机械干扰如何影响入侵的夏威夷息地中的植物社区聚集.
- 确定主导植被类型和居民物种在扰乱后恢复中的作用.
- 评估被入侵的草原的弹性和本地物种恢复的潜力.
主要方法:
- 在六种被侵袭的植被类型 (侵袭性草,本土灌木,本土草) 中,机械地扰乱了100平方米的地块.
- 在干扰后的21个月内监测了木质植物的殖民化和草本覆盖.
- 分类物种角色 (竞争者,殖民者) 和种植本地物种的评估生存率.
主要成果:
- 主导的植被类型表现出各种各样的干扰后综合征,在殖民者与竞争者角色中存在跨和内特异性变化.
- 本地灌木苗在被入侵的息地没有长期生存,这可能是由于入侵草的竞争性再生.
- 种植本地物种的存活率与主导居民物种的再生率有负相关性.
结论:
- 夏威夷的农业后,被侵袭的草原代表稳定的状态,表现出对干扰的高度弹性.
- 居民植物群体对物种相互作用和种子的可用性有很大的影响,塑造了社区对干扰的反应.
- 管理策略应考虑本地物种在维持被入侵生态系统稳定的强大影响.
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