“Nagshead SSSI”的意思、由来-开放百科全书

Nagshead ({{gbmapping|SO608090}}) is a {{convert|120.12 |ha|adj=on}} biological Site of Special Scientific Interest and is located near Parkend, in the Forest of Dean, Gloucestershire, and was notified in 1972.^[1]^[2] It lies within the Forest of Dean Forest Park and is part held as a reserve by the Royal Society for the Protection of Birds (RSPB).^[1] The SSSI is a relatively small area of the much larger nature reserve of RSPB Nagshead, which is a {{convert|1250|acre}} site owned and managed by the RSPB and the Forestry Commission. The SSSI lies to the east of the Nagshead Plantation and consists of two units of assessment by Natural England.

The site is listed in the 'Forest of Dean Local Plan Review' as a Key Wildlife Site (KWS).^[3]

History

The woodland in the Forest of Dean has been managed for timber for a significant time. As a consequence there is a variety of woodland types as a result of the woodland management. The central area of woodland is in the Coal Measures and this area supports oak with restricted ground flora. This is an acidic area. Around it are the limestone and Old Red Sandstone rocks. These provide soils which are more fertile and a richer ground flora.^[1]

The Nagshead site is one of three sites in the Forest of Dean which are of national nature conservation importance. It is an excellent example of broad-leaved woodland and is of major ornithological importance. The oldest part of the site was planted in 1814 and includes pedunculate oak and sessile oak.^[1]

Understorey

The ground flora of the understorey varies dependent upon whether the woodland is grazed by sheep. A dense shrub layer which is dominated by holly and rowan occurs in the ungrazed areas. Grazed areas are more open. Herb layers consists of bramble, bracken, softgrass and tufted hair grass. wood sorrel and bluebell are locally abundant.^[1]

Ponds and streams

The Cannop Brook runs within the site and there are semi-natural area of woodland (mostly alder). The diversity of the habitat is enhanced by small ponds and streams and there are rarer plants reported such as heath spotted orchid and broad-leaved helleborine.^[1]

Birdlife

This is an area which is rich in bird life and there are established populations of breeding pied flycatcher, wood warbler and redstart. There has been long established research into the breeding biology of various birds at Nagshead and there is a nestbox scheme managed by the RSPB.^[1]

Invertebrates

Butterflies are attracted by the open rides and recordings including white admiral, pearl-bordered fritillary and purple hairstreak. The Cannop Brook supports a good range of woodland invertebrates.^[1]

Conservation

The unit reports for 2009 indicate the need for a watching brief on the presence of sweet chestnut and sycamore. Implications of the lack of grazing are noted and how this may affect the woodland structure necessary for some breeding birds.^[4]

References

1. ^¹²³⁴⁵⁶⁷Natural England SSSI information on the citation
2. ^Forest of Dean District Local Plan Review, adopted November 2005, Appendix D 'Nature Conservation Site Designations Within the Forest of Dean District', Sites of Special Scientific Interest
3. ^Forest of Dean District Local Plan Review, adopted November 2005, Appendix D 'Nature Conservation Site Designations Within the Forest of Dean District', Key Wildlife Sites
4. ^Natural England reports on the units of assessment

SSSI Source

External links

5 : Sites of Special Scientific Interest in Gloucestershire|Sites of Special Scientific Interest notified in 1972|Nature reserves in Gloucestershire|Forest of Dean|Royal Society for the Protection of Birds reserves in England