自然保护与休闲部保护·守护·共享
自然保护与休闲部
Due to the expected impact of the winter storm, all Virginia State Park overnight facilities will be closed from Friday, Jan. 23 through Tuesday, Jan. 27. This decision is based on the forecast for unsafe conditions and potential power outages. For updates click here.
目录高海拔巨石林和林地
These open forests and woodlands occupy relatively unweathered boulderfields at elevations above 900 m (3,000 ft) in both the Blue Ridge and Ridge and Valley provinces. Communities in this group are known to occur from West Virginia south to northern Georgia. In Virginia, yellow birch (Betula alleghaniensis), American mountain-ash (Sorbus americana), and mountain maple (Acer spicatum) are the typical dominants of boulderfields weathered from granite, metabasalt, rhyolite, quartzite, and sandstone at the highest elevations. These habitats are usually best developed on north-facing slopes, where extreme winter temperatures, high winds, and ice storms strongly influence forest physiognomy. Trees here are typically gnarled and widely spaced because of difficult establishment and repeated damage from wind and ice. Typical shrubs include gooseberries (Ribes cynosbati, Ribes glandulosum, Ribes rotundifolium), hobblebush (Viburnum lantanoides), red raspberry (Rubus idaeus ssp. strigosus), and red-berried elder (Sambucus racemosus var. pubens ). The high cover of exposed rock in these habitats tends to limit overall species richness and herbaceous density. However, the Appalachian rock polypody (Polypodium appalachianum) is often abundant. Additional herbaceous species such as yellow blue-bead lily (Clintonia borealis), whorled aster (Oclemena acuminata = Aster acuminatus), Appalachian oak fern (Gymnocarpium appalachianum), marbled alumroot (Heuchera pubescens), brownish sedge (Carex brunnescens), and summer sedge (Carex aestivalis) may occur where substrate conditions are suitable. Cool microclimates favor the occurrence of many northern and high mountain species.
雪兰多蝾螈（学名 Plethodon shenandoah ）是全球稀有且被联邦政府列入名录的物种，是蓝岭山脉北部（佩吉县和麦迪逊县）三个树木稀疏、海拔较高的巨石区的特有物种。
该群很容易与低海拔博尔德菲尔德森林区分开来，因为北阿巴拉契亚和南阿巴拉契亚物种几乎完全占据主导地位，并且仅限于小气候凉爽的栖息地。参考文献：Fleming 和 Coulling ( 2001 )、Fleming 等人 ( 2007 )、Johnson 和 Ware ( 1982 )、Rheinhardt 和 Ware ( 1984 )。
© DCR-DNH，加里·P·弗莱明。
下载下面列出的每个社区类型的组成汇总统计电子表格。
