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首页> 外文期刊>Conservation Biology >Invasion of exotic plant species in tallgrass prairie fragments
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Invasion of exotic plant species in tallgrass prairie fragments

机译：高草草原大片段中外来植物物种的入侵

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The tallgrass prairie is one of the most severely affected ecosystems in North America. As a result of extensive conversion to agriculture during the last century, as little as 1% of the original tallgrass prairie remains. The remaining fragments of tallgrass prairie communities have conservation significance, but questions remain about their viability and importance to conservation. We investigated the effects of fragment size, native plant species diversity, and location on invasion by exotic plant species at 25 tallgrass prairie sites in central North America at various geographic scales. We used exotic species richness and relative cover as measures of invasion. Exotic species richness and cover were not related to area for all sites considered together. There were no significant relationships between native species richness and exotic species richness at the cluster and regional scale or for all sites considered together. At the local scale, exotic species richness was positively related to native species richness at four sites and negatively related at one. The 10 most frequently occurring and abundant exotic plant species in the prairie fragments were cool-season, or C-3, species, in contrast to the native plant community, which was dominated by warm-season, or C-4, species. This suggests that timing is important to the success of exotic species in the tallgrass prairie. Our study indicates that some small fragments of tallgrass prairie are relatively intact and should not be overlooked as long-term refuges for prairie species, sources of genetic variability, and material for restoration. [References: 49]
机译：高草草原是北美受影响最严重的生态系统之一。上个世纪广泛转向农业的结果是，仅保留了原始草木草原的1％。高草草原大草原社区的其余片段具有保护意义，但仍存在其生存能力和对保护的重要性的疑问。我们调查了片段大小，原生植物物种多样性和位置对北美中部25个不同草木规模的高草草原地区外来植物物种入侵的影响。我们使用外来物种的丰富度和相对覆盖率作为入侵的衡量标准。一起考虑的所有地点，外来物种的丰富度和覆盖率与面积均无关。在集群和区域范围内，或在所有地点综合考虑的情况下，本地物种丰富度与外来物种丰富度之间没有显着关系。在当地范围内，外来物种丰富度在四个地点与本地物种丰富度呈正相关，而在一个地点则呈负相关。在草原片段中，最常见的10种最丰富的外来植物物种是凉季（C-3）物种，而以暖季（C-4）为主的本地植物群落则相反。这表明时机对高草草原上外来物种的成功至关重要。我们的研究表明，高草草原的一些小片段相对完整，不应作为草原物种，遗传变异源和恢复材料的长期避难所而被忽视。 [参考：49]

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