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首页> 外文期刊>Southeastern naturalist >Vegetative survey of Martha's Meadow, an open limestone habitat in northwestern Georgia
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Vegetative survey of Martha's Meadow, an open limestone habitat in northwestern Georgia

机译：佐治亚州西北部石灰岩栖息地玛莎草原的植物调查

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The vegetation of Martha's Meadow (Berry College, Floyd County, GA) is distinct from that of surrounding flatwood areas and appears to be floristically similar to a limestone glade community. Limestone (cedar) glades of the southeastern United States are characterized by high species richness and diversity, calcareous soil, and up to 26 endemic or near-endemic indicator species. To describe the vegetation of Martha's Meadow and to determine its affinity to other limestone-based communities, a comprehensive species survey was augmented by quantitative surveys in May, July, and October of 2006. A total of 203 species in 56 families were identified, including nine limestoneassociated species designated as rare in the state of Georgia. Juniperus virginiana, a key species associated with glade communities, was important in both the overstory and the understory. Other important overstory species included Pinus taeda, Quercus shumardii, Q. muehlenbergii, and Ostrya virginiana. The perennial grass Danthonia spicata, the southeastern sedge Carex cherokeensis, and the herb Verbesina virginica, which is commonly associated with alkaline soils, were among the most important understory species, but no well-recognized limestone glade endemics were found. Two invasive grasses (Festuca subverticillata and Microstegium vimineum) were also among the most important understory species. Several ordination and clustering methods were used to compare the community structure of Martha's Meadow with data sets derived from other open calcareous and non-calcareous habitats throughout the southeastern and mid-western United States. Regardless of method, Martha's Meadow appeared to be most similar to several well-recognized Georgia limestone glades. While Martha's Meadow has some characteristics of edaphically determined limestone glades, it also lacks some characteristic traits (e.g., key limestone endemic species), making definitive classification tenuous. Evidence of on-going succession involving woody species suggests that the site might be best classified as a xeric limestone prairie (barrens) that requires disturbance or active management to maintain canopy openness and understory diversity.
机译：玛莎草地（乔治亚州弗洛伊德县贝里学院）的植被不同于周围的扁平木地区，并且在植物学上与石灰石林间空地群落相似。美国东南部的石灰石（雪松）林间空地的特点是物种丰富度和多样性高，钙质土壤以及多达26种地方性或近地方性指示物种。为了描述玛莎草原的植被并确定其与其他石灰岩群落的亲和力，2006年5月，7月和10月通过定量调查增强了全面的物种调查。共确定了56个科的203种，包括9种与石灰石相关的物种在乔治亚州被指定为稀有物种。与林间空地群落相关的关键物种杜鹃（Juniperus virginiana）在上层和下层都很重要。其他重要的地上物种包括taus taeda，Quercus shumardii，Q。muehlenbergii和Ostrya virginiana。多年生禾草Danthonia spicata，东南莎草Carex cherokeensis和通常与碱性土壤相关的草本韦尔比西纳维吉尼亚（Verbesina virginica）是最重要的林下物种，但未发现公认的石灰石林间空地。两种外来入侵草（Festuca subverticillata和Vistenium v​​imineum）也是最重要的林下种。几种排序和聚类方法被用来比较玛莎草地的群落结构和来自美国东南部和中西部其他钙质和非钙质生境的数据集。不管采用哪种方法，玛莎的草地似乎都与佐治亚州几处公认的石灰岩空地最为相似。尽管玛莎的草原具有一些由可确定的石灰岩空地组成的特征，但它也缺乏某些特征（例如关键的石灰岩特有物种），从而使确定的分类变得微不足道。涉及木本物种的持续演替的证据表明，该地点可能最好地归类为需要打扰或积极管理以维持冠层开放度和林下多样性的干性石灰岩大草原（贫瘠土地）。

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