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首页> 外文期刊>Applied Vegetation Science >Diversity of native and alien vascular plant species of dry grasslands in central Europe
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Diversity of native and alien vascular plant species of dry grasslands in central Europe

机译：欧洲中部干旱草原天然和外来维管植物物种的多样性

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Question: Which factors determine diversity of native and alien vascular plant species in semi-natural dry grasslands?Location: Northern limestone Alps to the Southern rim of the Bohemian massif in northern Austria.Methods: In 70 randomly chosen dry grassland patches (0.008 ha - 7 ha) we sampled a complete inventory of vascular plant species at each site. We analysed the correlation between species diversity of natives. archaeophytes (pre-1500 aliens) and neophytes (post-1500 aliens). We used GLM to study the relationship of species number (natives, neophytes. archaeophytes) to five explanatory variables (altitude. within habitat diversity habitat diversity of adjacent areas, within land-use diversity and land-use derived with a PCA and used in the models. We also tested the influence of minimum residence time (MRT) and the covariables origin, mode of introduction and life form on the number of grassland sites with neophytes with analogous GLMs.Results: Native species diversity species was positively correlated with the species diversity of new. but not old invaders. GLM explains 70% of the variance in the number of native species. Patch size explained the largest part of the variation in the number of native species. PCA axes 1 and 3 were significantly related to the number of native species. Axis 1 was related to on-site habitat and land-use diversity. The GLM of the archaeophyte diversity explains 18% of the variance. Altitude and presence of fields and grassland in the neighbourhood mainly explained archaeophyte species diversity. The GLM of neophyte diversity explains 12% of the variance. The number of neophytes was positively related to that of archaeophytes. Only PCA axis 3. which is mainly influenced by adjacent land-use types. showed a relationship with neophytes. MRT. mode of introduction and region of origin (but not life form) were significantly related to the number of grassland sites invaded by neophytes. explaining 35% of the variance.Conclusion: Most factors governing native species diversity are not significantly related to alien species diversity. Additional determinants of the local scale diversity of alien species exist such as region of origin and historical factors (MRT, mode of introduction).
机译：问题：哪些因素决定了半天然干旱草地上原生和外来维管植物物种的多样性？位置：北部石灰岩阿尔卑斯山至奥地利北部波西米亚断层山脉南缘方法：在70个随机选择的干旱草地片中（0.008公顷- 7公顷），我们在每个站点采样了完整的维管植物物种清单。我们分析了本地人物种多样性之间的相关性。古生植物（1500年以前的外星人）和新植物（1500年之后的外星人）。我们使用GLM来研究物种数量（原生种，新生植物，古生植物）与五个解释变量（海拔）的关系（栖息地多样性内，相邻区域的栖息地多样性，PCA得出并在土地利用多样性和土地利用中使用）。我们还测试了最小停留时间（MRT）和协变量起源，引入方式和生命形式对具有类似GLM的新植物的草地位点数量的影响。结果：本地物种多样性物种与物种多样性呈正相关GLM解释了本地物种数量变化的70％;斑块大小解释了本地物种数量变化的最大部分; PCA轴1和3与物种数量显着相关。第1轴与现场栖息地和土地利用多样性有关，古生植物多样性的GLM解释了18％的变化。在附近主要解释古生植物的物种多样性。新植物多样性的GLM解释了12％的方差。新生植物的数量与古生植物的数量呈正相关。仅PCA轴3.主要受相邻土地利用类型的影响。表现出与新植物的关系。捷运。引入方式和起源区域（而非生命形式）与新生植物入侵的草地数量显着相关。解释了35％的方差。结论：控制本地物种多样性的大多数因素与外来物种多样性没有显着相关。还存在其他决定外来物种多样性的因素，例如起源地区和历史因素（MRT，引入方式）。

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