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The new flora of northeastern USA: quantifying introduced plant species occupancy in forest ecosystems

机译：美国东北部的新植物区系：量化森林生态系统中引入的植物物种占用

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Introduced plant species have significant negative impacts in many ecosystems and are found in many forests around the world. Some factors linked to the distribution of introduced species include fragmentation and disturbance, native species richness, and climatic and physical conditions of the landscape. However, there are few data sources that enable the assessment of introduced species occupancy in native plant communities over broad regions. Vegetation data from 1,302 forest inventory plots across 24 states in northeastern and mid-western USA were used to examine and compare the distribution of introduced spe-cies in relation to forest fragmentation across ecological provinces and forest types, and to examine correlations between native and introduced species richness. There were 305 introduced species recorded, and 66 % of all forested plots had at least one introduced species. Forest edge plots had higher constancy and occupancy of introduced species than intact forest plots, but the differences varied significantly among ecological provinces and, to a lesser degree, forest types. Weak but significant positive correlations between native and introduced species richness were observed most often in intact forests. Rosa multiflora was the most common introduced species recorded across the region, but Hieracium aurantiacum and Epipactus helleborine were dominant in some ecological provinces. Identifying regions and forest types with high and low constancies and occupation by introduced species can help target forest stands where management actions will be the most effective. Identifying seemingly benign introduced species that are more prevalent than realized will help focus attention on newly emerging invasives.
机译：引进的植物物种在许多生态系统中具有重大的负面影响，在世界各地的许多森林中都可以发现。与引进物种分布有关的一些因素包括破碎和干扰，本地物种丰富度以及景观的气候和自然条件。但是，很少有数据来源能够评估大范围本地植物群落中引入物种的占有率。来自美国东北和中西部24个州的1,302个森林资源调查区的植被数据用于检查和比较与生态系统和森林类型相关的森林破碎化相关的物种分布，并研究原生物种和引进森林之间的相关性。物种丰富度。记录了305种引进物种，所有森林地块中有66％至少有一种引进物种。与完整林地相比，森林边缘地块具有较高的固定性和占有率，但不同生态省之间的差异显着，而林地类型差异较小。在原始森林中，最经常观察到本地物种和引进物种丰富度之间的微弱但显着的正相关。蔷薇（Rosa multiflora）是该地区记录的最常见的引进物种，但在一些生态省份中，紫er（Hieracium aurantiacum）和欧Epi草（Epipactus helleborine）占主导地位。识别具有高低一致性的区域和森林类型，以及被引进树种占据的森林类型，可以帮助以管理行动最有效的林区为目标。鉴定看似良性的，比实际流行的物种更受欢迎，这有助于将注意力集中在新出现的入侵物种上。

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