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首页> 外文期刊>Conservation Biology >Effects of earthworm invasion on plant species richness in northern hardwood forests
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Effects of earthworm invasion on plant species richness in northern hardwood forests

机译：northern入侵对北方阔叶林植物丰富度的影响

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The invasion of non-native earthworms (Lumbricus spp.) into a small number of intensively studied stands of northern hardwood forest has been linked to declines in plant diversity and the local extirpation of one threatened species. It is unknown, however whether these changes have occurred across larger regions of hardwood forests, which plant species are most vulnerable, or with which earthworm species such changes are associated most closely. To address these issues we conducted a regional survey in the Chippewa and Chequamegon national forests in Minnesota and Wisconsin (U.S.A.), respectively. We sampled earthworms, soils, and vegetation, examined deer browse in 20 mature, sugar-maple-dominated forest stands in each national forest, and analyzed the relationship between invasive earthworms and vascular plant species richness and composition. Invasion by Lumbricus was a strong indicator of reduced plant richness in both national forests. The mass of Lumbricus juveniles was significantly and negatively related to plant-species richness in both forests. In addition, Lumbricus was a significant factor affecting plant richness in a full model that included multiple variables. In the Chequamegon National Forest earthworm mass was associated with higher sedge cover and lower cover of sugar maple seedlings and several forb species. The trends were similar but not as pronounced in Chippewa, perhaps due to lower deer densities and different earthworm species composition. Our results provide regional evidence that invasion by Lumbricus species may be an important mechanism in reduced plant-species richness and changes in plant communities in mature forests dominated by sugar maples.
机译：非本地studied（Lumbricus spp。）进入少数经过深入研究的北部硬木林分的入侵与植物多样性的下降和一种濒临灭绝物种的局部灭绝有关。但是，这些变化是否发生在较大的阔叶林地区，哪些植物物种最脆弱或与哪些species物种最紧密相关的变化上。为解决这些问题，我们分别在明尼苏达州和威斯康星州（美国）的奇珀瓦和奇夸梅贡国家森林中进行了区域调查。我们对earth，土壤和植被进行了采样，在每个国家森林中的20个以糖枫为主的成熟林分中研究了鹿的browse游行为，并分析了入侵earth与维管植物物种丰富度和组成之间的关系。伦比卡斯（Lumbricus）的入侵是两个国家森林中植物丰富度降低的有力指标。两种森林中of类幼体的数量与植物种类的丰富度均呈显着负相关。此外，在包括多个变量的完整模型中，Lu豆是影响植物丰富度的重要因素。在Chequamegon国家森林公园，earth的团聚与较高的莎草覆盖和较低的糖枫树苗以及几种福特树种的覆盖有关。这种趋势是相似的，但在奇佩瓦却没有那么明显，这可能是由于鹿密度较低和earth物种组成不同所致。我们的研究结果提供了区域证据，表明Lu虫入侵可能是减少植物物种丰富性和糖枫为主的成熟森林植物群落变化的重要机制。

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