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.
目录沙洲/砾石/泥洲和海岸
河流和大溪流间歇性暴露的海岸和沉积沙洲支持着特殊的草本植被。该群体中的群落规模较小，分布局部，环境和植物区系均独具特色。它们广泛分布于弗吉尼亚州各地，但主要分布在大河沿岸，且发育最为完善。有时，在季节性暴露的蓄水河流水库底部和岸边，也可以发现同样的植被，而且面积很大。栖息地通常在冬季和春季被淹没，但在夏季水位会下降，在干旱年份的夏末和秋季可能会大量暴露在外。基质由细质地至中粗冲积层组成。植被多种多样，但一般以特别适应洪水和暴露循环的草本植物为主。这些物种的种子库或多年生砧木能够在长时间的浸没条件下保持活力，并在有利的下降条件下迅速发芽。在这些栖息地中，被洪水冲毁的灌木和树苗稀疏地分布着。
Species of relatively wide distribution on sandy or gravelly draw-down shores include creeping dayflower (Commelina diffusa), red-root flatsedge (Cyperus erythrorhizos), creeping lovegrass (Eragrostis hypnoides), halberd-leaf rose-mallow (Hibiscus laevis), small-flower halfchaff sedge (Cyperus subsquarrosus), common water-willow (Justicia americana), low spikesedge (Cyperus hortensis), false pimpernels (Lindernia dubia var. dubia and var. anagallidea), seedboxes (Ludwigia spp.), spreading panic grass (Panicum dichotomiflorum var. dichotomiflorum), water paspalum (Paspalum fluitans), marsh yellow cress (Rorippa palustris ssp. palustris ), and toothcup (Rotala ramosior). Species characteristic of Piedmont and mountain draw-down shores include scarlet ammannia (Ammannia coccinea), nodding beggar-ticks (Bidens cernua), three-lobe beggar-ticks (Bidens comosa), spreading sandmat (Euphorbia humistrata), awned flatsedge (Cyperus squarrosus), dock-leaf smartweed (Persicaria lapathifolia), and Carolina leaf-flower (Phyllanthus caroliniensis ssp. caroliniensis). Species most typical of Coastal Plain draw-down shores include white-edge flatsedge (Cyperus flavicomus), coastal flatsedge (Cyperus polystachyos), shade mudflower (Micranthemum umbrosum), lax hornpod (Mitreola petiolata), American halfchaff sedge (Cyperus neotropicalis), Bosc's bluets (Oldenlandia boscii), warty panic grass (Kellochloa verrucosa), and coastal rose-pink (Sabatia calycina).
参考文献：DeBerry 和 Perry ( 2005 )、Fleming ( 2007 )、Lea ( 2000 )、Ludwig ( 1996 )。
© 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。
