What does the NVC cover?

 

The NVC is a detailed phytosociological classification, which assesses the full suite of vascular plant, bryophyte and macro-lichen species within a certain vegetation type. It is based on about 35,000 samples of vegetation, the distribution of which is shown in the map left. These cover nearly all natural, semi-natural and a number of major artificial vegetation communities in terrestrial, freshwater and maritime situations across Great Britain (but not Northern Ireland).

 

The NVC contrasts with broader-scale classifications, notably the Phase 1 Habitat Classification and the Biodiversity Action Plan (BAP) Broad Habitats. These do not break down broad habitat types into such detailed constituent parts as the NVC does. The NVC is, however, less comprehensive in coverage than Phase 1, because it does not encompass habitats which lack vascular plant growth (such as many aquatic and rock habitats), and not all artificial habitats are covered.

 

As the NVC is based solely on plant species composition, its application is limited in certain habitat types where floristics are not the best tool for their definition. For example, the NVC is less appropriate to the dynamic vegetation of aquatic systems and an alternative classification has been applied to the selection of freshwater Sites of Special Scientific Interest.

 

Structural variation in vegetation is not well represented in the NVC, limiting its value as a habitat classification for invertebrates and other fauna. Other specialised habitats, such as river shingle, may have biodiversity importance but no vegetation: as such they are not covered by the NVC.

 

 

 

A review of the coverage of the NVC was commissioned in 1998 (see Rodwell et al. 2000). This produced information on the coverage of NVC, identified both known and likely gaps in the plant community descriptions, partly by comparing the NVC with European phytosociological classification systems, and placed these potential new types into the phytosociological scheme of the NVC. A number of further communities were identified that have still to be described in full within the NVC. These include, amongst others: