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Non-Nvc Vegetation Types Found by Ben and Alison Averis 2020-06

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Non-Nvc Vegetation Types Found by Ben and Alison Averis 2020-06 PLANT COMMUNITIES FOUND IN SURVEYS BY BEN AND ALISON AVERIS BUT NOT DESCRIBED IN THE UK NATIONAL VEGETATION CLASSIFICATION Ben and Alison Averis [email protected] [email protected] Tel: 01620 830 670 / 07767 058 322 (Ben) / 07387 970 667 (Alison) June 2020 i PLANT COMMUNITIES FOUND IN SURVEYS BY BEN AND ALISON AVERIS BUT NOT DESCRIBED IN THE UK NATIONAL VEGETATION CLASSIFICATION Ben and Alison Averis June 2020 These short summary descriptions are presented here to help people working with vegetation surveys and the UK National Vegetation Classification (NVC) (Rodwell 1991 et seq.). They describe vegetation types which we have seen during our surveys in Britain and Ireland but which are not included in the NVC or which can be classed as particular distinctive forms of existing NVC communities or sub-communities. The descriptions that follow are based on our own observations except where acknowledged. Also included here are a few vegetation types that are floristically intermediate between two NVC communities. NVC intermediates are so numerous and so common that an attempt to describe all of them would cause great complexity and confusion. They can often be recognized fairly easily anyway, and classified as such (for example U4-U5 or M15a-c). However, a few NVC intermediates are included here because they are particularly common, extensive or distinctive. Vegetation types restricted to extremely narrow or linear strips such as that between a roadside verge and the base of an adjacent hedge or wall are not included. There is something of a northern/upland bias to the vegetation types described here. This is because most of our survey work has been in northern and upland areas. The vegetation types are ordered into broad groupings: Woodland and scrub; Heaths; Bogs; Rush-dominated vegetation; Other wetlands; Grasslands; Fern-dominated vegetation; Montane summit/snowbed habitats; Coastal vegetation; Other habitats. NVC codes are referred to wherever relevant; a list of the codes and names of all NVC communities is given at the end of this document, and where sub-communities are mentioned in the text, their names are given. For the purpose of vegetation survey maps and associated reports, made-up ‘non-NVC’ codes and names can be used for communities without official published codes and names; some codes we have used are mentioned in this document. Many of the vegetation types described here are also included along with additional ‘non-NVC’ vegetation types (found by other people and not seen by us) in the Review of coverage of the National Vegetation Classification (Rodwell et al. 2000). Appendix 1 indicates correspondences with Phase One habitats, UK Biodiversity Action Plan priority habitats and EC Annex 1 habitats. Appendix 2 gives a list of all NVC community codes and names. We hope this document will be of use to vegetation surveyors and other people with an interest in British vegetation. Any feedback will be welcome. A revised version will be produced and made available if and when appropriate. ii OTHER WETLANDS – PAGE 38 CONTENTS Neutral small sedge mire (related to M5/6/10/23) Equisetum palustre neutral mire (related to M23) WOODLAND AND SCRUB – PAGE 1 Molinia caerulea-Schoenus nigricans flush (a form of M25c) Salix aurita-dominated forms of W4 and W7 Molinia caerulea-Myrica gale mire (a form of M25a) Salix cinerea-dominated forms of W4 and W7 Potamogeton polygonifolius soakway (a form of M29) Dry woodland with a nettle-dominated ground layer Phragmites australis-Juncus-Filipendula ulmaria fen (a form of S25 Hazel-dominated W9 and W11 without Eupatorium) Woodland with abundant Arrhenatherum elatius and/or Dactylis Carex lasiocarpa mire glomerata (related to W10) Carex acuta swamp Oak/birch woodland with Luzula sylvatica field layer (related to Carex aquatilis swamp W10/11/16/17) Carex disticha mire/swamp Oak-birch woodland with species-poor W11 field layer Iris pseudacorus swamp Alder-dominated W11 Ranunculus lingua swamp Ash-dominated W11 Menyanthes trifoliata swamp Western oak/birch woodland with Molinia-Vaccinium field layer Menyanthes trifoliata bog pool (W4-17 NVC intermediate) GRASSLANDS – PAGE 46 Aspen-dominated W11 and W17 Montane Deschampsia flexuosa acid grassland Pinus sylvestris-Molinia caerulea form of W18d Festuca-Agrostis acid grassland + abundant Carex nigra (a form of Pinus sylvestris-Cladonia woodland U4a) Acidic Salix lapponum montane willow scrub (a form of W20) Northern forms of U4c acid-neutral grassland (without betony) Conifer plantation Festuca-Agrostis acid grassland with abundant Alchemilla alpina (a Elder scrub (related to W21) form of U4e) Broom scrub (a form of W23) Festuca-Agrostis acid-neutral grassland with damp-loving Ulex gallii scrub mesotrophic herbs (a flushed, enriched form of U4) Rhododendron ponticum in woodland and in more open scrub Nardus stricta-Calluna vulgaris-Racomitrium lanuginosum acid grassy Buddleja davidii scrub heath (a form of U5e) Knotweed scrub Nardus stricta acid grassland with abundant Alchemilla alpina (a DWARF SHRUB HEATHS – PAGE 13 form of U5e) Species-poor Calluna vulgaris heath intermediate between H9 & H12 Nardus stricta-Trichophorum germanicum-Narthecium ossifragum Calluna vulgaris-Erica cinerea-Vaccinium myrtillus heath vegetation (a form of U5e) intermediate between H10 and H12 (H10-12) Liverwort-rich Nardus stricta snowbed grassland (a form of U7a) Erica cinerea heath (a form of H10) Species-poor Molinia caerulea acid grassland (a form of M25) Calluna vulgaris-Vaccinium myrtillus heath with abundant Deschampsia cespitosa grassland including acidophilous species Racomitrium lanuginosum (a form of H12) (related to MG9) Calluna vulgaris-Vaccinium myrtillus heath with abundant Carex Holcus lanatus neutral grassland bigelowii (a form of H12) Holcus lanatus/mollis neutral grassland Species-poor prostrate/wind-clipped Calluna vulgaris heath (related Holcus mollis neutral grassland to H13/14) Holcus lanatus-Agrostis stolonifera-Ranunculus repens neutral Short Calluna-Empetrum heath without Erica or Vaccinium grassland Calluna vulgaris heath with mesotrophic herbs Festuca rubra-Holcus lanatus neutral grassland Western Calluna vulgaris-Arctostaphylos uva-ursi heath Elytrigia repens grassland Calcicolous Arctostaphylos uva-ursi heath Poa annua neutral grassland Damp, non-montane Vaccinium myrtillus heath (related to H18/H21) Helictotrichon pratense neutral-basic grassland Western heathy flush with Schoenus nigricans (a form of M15a) FERN-DOMINATED VEGETATION – PAGE 55 Trichophorum germanicum-Narthecium ossifragum vegetation Dryopteris affinis vegetation (closest to M15a) Dryopteris filix-mas vegetation Calluna vulgaris-Molinia caerulea wet heath (a form of M15b) Dryopteris dilatata vegetation Racomitrium-Cladonia variation within M15c Trichophorum- Athyrium filix-femina vegetation Eriophorum bog, Cladonia sub-community Mixed tall fern vegetation Short wet heath with abundant dwarf juniper (a form of M15c) Blechnum spicant vegetation Montane Trichophorum-Empetrum-Racomitrium wet heath (a form Bracken-dominated vegetation with herbs of damp mesotrophic soils of M15c) Bracken-Molinia vegetation (related to U20) Montane Trichophorum-Vaccinium-Empetrum wet heath (a form of M15d) MONTANE SUMMITS & SNOWBEDS – PAGE 60 Wet heath with abundant Ulex gallii (related to M15) Fell-field Trichophorum germanicum-dominated wet heath (M15/M16) Lichen heath BOGS – PAGE 29 Racomitrium ericoides moss-heath Carex bigelowii swards M17-type bog with little or no S. papillosum Pohlia ludwigii snowbed Bog with abundant Schoenus nigricans (a form of M17) Racomitrium heterostichum snowbed Bog with abundant Narthecium ossifragum (a form of M17) Mixed snowbed Racomitrium-Cladonia variation within M17b Trichophorum- Eriophorum bog, Cladonia sub-community COASTAL VEGETATION – PAGE 64 Eriophorum vaginatum bog (M20) – form with abundant Sphagnum Schoenus nigricans-Eupatorium cannabinum sea-cliff community fallax and/or Polytrichum commune Catabrosa aquatica community Eriophorum vaginatum bog (M20) – drier form with other graminoids OTHER HABITATS – PAGE 65 Racomitrium lanuginosum rock/scree community RUSH-DOMINATED VEGETATION – PAGE 32 Racomitrium ericoides shingle vegetation Juncus effusus acid grassland community Pioneer bryophyte vegetation on disturbed upland acid soils Juncus acutiflorus acid grassland community Polytrichum commune-dominated vegetation Juncus acutiflorus neutral grassland (related to MG10 & M23a) Ivy-dominated vegetation on cliffs Juncus articulatus neutral rush mire (closely related to M23a) Rubus idaeus underscrub Juncus conglomeratus neutral grassland (closely related to MG10a) Cirsium arvense-dominated vegetation Juncus conglomeratus neutral rush mire (closely related to M23b) Rumex obtusifolius vegetation Juncus inflexus neutral rush mire (closely related to M23) Petasites hybridus-Urtica dioica-Aegopodium podagraria vegetation Species-poor Juncus squarrosus vegetation (a form of U6) Impatiens glandulifera vegetation Juncus squarrosus vegetation with Carex bigelowii (a form of U6) Juncus squarrosus-Calluna vulgaris heath REFERENCES – PAGE 70 Herb-rich Juncus squarrosus flush APPENDICES – PAGE 71 iii WOODLAND AND SCRUB Salix aurita scrub with a W4-type ground flora, on damp to wet acid soils Salix aurita scrub with ground vegetation including good quantities of at least one of Molinia caerulea, Sphagnum spp. and Polytrichum commune. It has the wet, acidophilous ground layer characteristic of W4, and for this reason the vegetation appears better regarded as a
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