Plaster's Green Meadows: A Rare Biological Site of Special Scientific Interest
Nestled near the village of Nempnett Thrubwell in Bath and North East Somerset lies Plaster's Green Meadows, a sanctuary of biodiversity. Designated as a Site of Special Scientific Interest (SSSI)—a conservation designation used in the UK to protect the best and most representative examples of the country's flora, fauna, or geological features—this site serves as a critical refuge for rare grassland communities.
Covering 4.3 hectares, these meadows are a testament to traditional land management. Unlike modern agricultural fields, these are unimproved, species-rich meadows that support a neutral grassland community, a habitat type that has become increasingly rare across Britain.
[ไม่มีภาพประกอบ]Key Facts
- Location: Near Nempnett Thrubwell, Bath and North East Somerset.
- Size: 4.3 hectares (approximately 0.017 square miles).
- Designation: Biological SSSI, notified in 1989.
- Geology: Underlain by Rhaetic clays and Keuper Red Marl.
- Primary Interest: Rare neutral grassland and diverse herb species.
Geology and Soil Composition
The unique biological makeup of Plaster's Green Meadows is driven by its physical geography. The site is situated on the slopes fringing the Lias Tablelands. The ground is primarily composed of Rhaetic clays, with Keuper Red Marl (a reddish, calcareous clay) found further down the slope.
These clay soils are slowly permeable and slightly calcareous, meaning they contain calcium carbonate. This specific chemical composition directly influences the types of flora that can thrive in the area, allowing for a blend of species that might not coexist in more acidic soils.
Botanical Diversity
Grassland Species
The meadows are characterized by a mix of dominant and rare grasses. Notably, the site supports the nationally rare Common Knapweed (Centaurea nigra) and Crested Dog’s-tail (Cynosurus cristatus). Other frequent grasses include:
- Sweet Vernal-grass (Anthoxanthum odoratum)
- Yorkshire Fog (Holcus lanatus)
- Quaking Grass (Briza media)
- Yellow Oat-grass (Trisetum flavescens)
Herbaceous Flora
The site boasts a high density of herb species. General meadow favorites include Saw-wort, Dyer’s Greenweed, Pepper-saxifrage, Devil’s-bit Scabious, Betony, and Spiny Restharrow. Because of the calcareous nature of the soil, the meadows also host specific plants such as Cowslip, Fairy Flax, Glaucous Sedge, Lady’s Bedstraw, and occasional Salad Burnet.
Hedgerows and Trees
The boundaries of the meadows are defined by rich hedgerows. These hedges support a variety of shrubs and trees, including Hawthorn, Wych Elm, English Elm, Hazel, and Field Maple. Larger hedgerow trees provide further structural diversity, with Ash, Sweet Chestnut, Holly, and various Oak species present.
Site Summary
| Feature | Details |
|---|---|
| Grid Reference | ST532611 |
| Coordinates | 51°20′49″N 2°40′24″W |
| Notification Year | 1989 |
| Soil Type | Slightly calcareous, slowly permeable clay |
| Key Rare Species | Common Knapweed, Crested Dog’s-tail |
Frequently Asked Questions
What makes Plaster's Green Meadows scientifically important?
Its importance lies in its status as an unimproved, traditionally managed species-rich meadow. It supports a neutral grassland community that is now rare throughout Britain.
What is the total area of the site?
The site covers 4.3 hectares, which is approximately 0.043 square kilometers or 0.017 square miles.
How does the soil affect the plants found here?
The soil is slightly calcareous (containing calcium carbonate) and consists of Rhaetic clays and Keuper Red Marl. This chemistry allows specific plants like Cowslip and Fairy Flax to grow.
When was this area designated as an SSSI?
Plaster's Green Meadows was officially notified as a Site of Special Scientific Interest in 1989.
What types of trees are found in the surrounding hedges?
The hedges include a variety of species such as Hawthorn, Hazel, and Field Maple, along with larger trees like Ash, Oak, Holly, and Sweet Chestnut.