自然多样化的植物群落无法抵抗强大的竞争对手Microstegium vimineum的入侵
Griffin Lee Williams1, J Stephen Brewer1
1Department of Biology, University of Mississippi, University, 38677-1848, Mississippi, USA.
American journal of botany
|June 29, 2024
概括
高物种多样性社区抵御入侵,但不是高度竞争性的物种,如Microstegium vimineum. 需要彻底清除入侵性草,以保护生产区的本土植物多样性.
科学领域:
- 生态生态学 生态生态学
- 侵入性物种 生物学 生物学
- 社区生态学 社区生态学
背景情况:
- 生态理论和研究表明,高物种多样性增强了社区对入侵物种的抵抗力.
- 然而,这种多样性介导的抵抗力在自然环境中对高度竞争的入侵者的有效性仍然不太清楚.
- 很少有研究同时评估入侵抵抗力和入侵者对居民社区的影响.
研究的目的:
- 研究多样性介导的对侵入性草 Microstegium vimineum (M. vimineum) 的竞争性耐药性的研究.
- 评估M. vimineum对居民植物多样性的竞争影响.
- 评估本地植物密度操纵和除草剂应用在控制M. vimineum入侵的有效性.
主要方法:
- 一个为期两年的实地实验通过删除罕见物种或减少主导物种密度来操纵本地植物多样性.
- 这项研究检查了M. vimineum对这些多样性治疗的反应.
- 评估了M. vimineum对居民多样性的影响,通过在第二年应用预先出现的除草剂来减少入侵者密度.
主要成果:
- 无论是稀有物种的移除,还是主导物种的减少都没有显著改变M. vimineum的密度.
- 在第二年,除草剂的应用有效地减少了M. vimineum.
- 居民多年生植物,特别是生产地点,由于M. vimineum的竞争减少,因除草剂的应用而间接受益.
结论:
- 多样性介导的抵抗对高度竞争力的入侵者M. vimineum.无效.
- 在被M. vimineum入侵的生产性地点保存本土植物多样性,需要几乎完全清除入侵性草.
- 管理策略应侧重于对具有高度竞争力的入侵物种进行积极控制.
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