Phase 2 Saltmarsh Survey of Wales

Coastal saltmarshes in the UK comprise of the upper, vegetated portions of intertidal mudflats, lying approximately between mean high water neap tides and mean high water spring tides. Saltmarshes are usually restricted to comparatively sheltered locations in five main physiographic situations: in estuaries, in saline lagoons, behind barrier islands, at the heads of sea lochs, and on beach plains. The development of saltmarsh vegetation is dependent on the presence of intertidal mudflats. Communities are additionally affected by differences in climate, the particle size of the sediment and, within estuaries, by decreasing salinity in the upper reaches. This National Vegetation Classification (NVC) Phase 2 project and corresponding datasets are a collation of mapped saltmarsh habi
tats across Wales. This data was collected to provide an overview of saltmarshes across Wales. In addition to this it has helped contribute towards the monitoring of Special Area of Conservation, which includes: Carmarthen Bay and Estuaries / Bae Caerfyrddin ac Aberoedd; Glannau Môn: Cors heli / Anglesey Coast: Saltmarsh; Pembrokeshire Marine / Sir Benfro Forol; Pen Llyn a`r Sarnau / Lleyn Peninsula and the Sarnau; Dee Estuary / Aber Dyfrdwy and Severn Estuary / Môr Hafren. The surveys were conducted between 1990 and 2003. The dataset has been extensively validated and verified. Data collected by trained personnel, digitised by contractors, validated by NRW KMG, corrections made by contractors, validated again by NRW KMG, corrections made in-house in conjunction with relevant s
alt marsh specialist.

英国沿海盐沼主要由潮间带滩涂的上部植被区域组成，其范围大致介于平潮高潮与春潮高潮之间。盐沼通常局限于五种主要的地理环境中，这些环境相对隐蔽：河口、盐沼湖、屏障岛屿后方、海 Loch 的入海口以及沙滩平原。盐沼植被的发展依赖于潮间带滩涂的存在。此外，社区的发展还受到气候差异、沉积物颗粒大小以及河口上游盐度降低等因素的影响。本国家植被分类（NVC）第二阶段项目和相应的数据集是对威尔士境内盐沼栖息地的全面汇总。这些数据的收集旨在概述威尔士境内的盐沼状况。此外，它还有助于对特殊保护区的监测，包括：卡马森湾和河口/卡马森湾及河口；莫恩湾：赫尔湖/安格莱西海岸：盐沼；彭布罗克海角/本弗雷角；彭林和萨诺乌/莱恩半岛和萨诺乌；迪河河口/迪弗德湾和塞文河河口/哈弗恩海。调查工作于1990年至2003年期间进行。该数据集已经过广泛的验证和核实。由受过培训的人员收集的数据，由承包商数字化处理，并由NRW KMG进行验证，之后由承包商进行修正，再次由NRW KMG进行验证，并在与相关盐沼专家的协作下进行内部修正。