植物入侵的自我强化的影响随着时间的推移而变化
Stephanie G Yelenik1, Carla M D'Antonio
11] Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, California 93106, USA [2] US Geological Survey, Pacific Island Ecosystems Research Center, Hawai'i Volcanoes National Park, Hawai'i 96718, USA.
Nature
|November 22, 2013
概括
异国草最初增加了土壤,帮助它们的传播. 然而,这些反随着时间的推移而减弱,现在更喜欢像Morella faya这样的新入侵物种,而不是本地植物.
科学领域:
- 生态生态学 生态生态学
- 保护生物学 保护生物学
- 侵袭性物种管理 侵袭性物种管理
背景情况:
- 生物入侵带来了重大的保护挑战,往往导致持续的生态系统状态改变.
- 异国植物可以修改生态系统过程,如营养循环,可能会产生自我强化的积极反.
- 长期研究对于理解这些入侵反的时间动态至关重要.
研究的目的:
- 在几十年后重新评估夏威夷森林中的异国C4草的生态系统影响和反机制.
- 确定最初有利于侵入性草的积极反是否持续或转移.
- 评估改变生态系统反对本地物种恢复的影响.
主要方法:
- 重新参观了上世纪90年代之前研究的夏威夷火山国家公园的入侵地点.
- 测量土壤矿化率,以追踪营养循环的变化.
- 进行不同土壤和竞争水平的苗木外栽实验.
主要成果:
- 外来草和土壤循环之间的积极反已经减少,矿化恢复到入侵前的水平.
- 的可用性下降并不有利于本地物种的恢复.
- 降低土壤的好处是一个新的入侵物种,固定树Morella faya.
结论:
- 与生物入侵相关的生态系统影响和反是动态的,可以随着时间的推移而变化.
- 最初入侵者的积极反减弱并不一定会导致本地物种的恢复.
- 保护战略必须考虑到入侵影响的不断变化的性质,以有效管理生态系统.
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