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Phase 1 & NVC Report Gordonbush Extension Wind Farm Appendix 8.1a Environmental Statement Phase 1 and NVC Report Report to: SSE Renewables Developments (UK) Ltd Contract No: J509 Phase 1 and NVC survey at Gordonbush Extension Wind Farm: 2013 Survey Results Author: Fraser Milne August 2013 Checked by: Kathy Ader September 2013 Northern Ecological Services, North Wing, Aboyne Castle Business Centre, Aboyne, Aberdeenshire, AB34 5JP. Tel: 013398 87407, [email protected], www.northecol.co.uk Gordonbush Extension Wind Farm Appendix 8.1a Environmental Statement Phase 1 and NVC Report SUMMARY BACKGROUND A National Classification Survey (NVC) was undertaken on the proposed Gordonbush Extension Wind Farm site, Sutherland (NC844132). Special emphasis was given to identifying Ground Water Dependent Terrestrial Ecosystems (GWDTEs). MAIN FINDINGS . The majority of the site supports M17 Trichophorum-Eriophorum mire and M15 Trichophorum-Erica wet heath. Drier slopes support H10 Calluna-Erica heath and H12 Calluna-Vaccinium heath. Acid M6 Carex-Sphagnum mire marks out flush lines, typically along the fringes of watercourses. Other communities include small areas of U4 Festuca-Agrostis-Galium grassland, bracken and U6 Juncus-Festuca grassland. The blanket bog has been subject to historic draining, peat cutting and, more recently, burning. This has modified the floristics in certain areas giving rise to a drier bog community largely dominated by Trichophorum germanicum and Calluna vulgaris. In other, flatter areas, drainage has had a limited impact on floristics with good levels of Sphagnum still present. Burning has also created a hybrid wet/dry heath community with affinities to the M15 Trichophorum-Erica wet heath and H10 Calluna-Erica dry heath. Ground water dependent terrestrial ecosystems are largely restricted to M6 flushes. Species of local interest include Sphagnum fuscum and Drosera anglica. _________________________________________________________________________ 2 Northern Ecological Services, Aboyne September 2013 Gordonbush Extension Wind Farm Appendix 8.1a Environmental Statement Phase 1 and NVC Report CONTENTS SUMMARY ........................................................................................................................... 2 1. INTRODUCTION ........................................................................................................... 4 Background ........................................................................................................................................... 4 Aims & Objectives ................................................................................................................................ 4 Topography ........................................................................................................................................... 4 Geology and soils ................................................................................................................................... 4 Land use ................................................................................................................................................. 4 Survey limitations ................................................................................................................................. 4 2. METHODOLOGY .......................................................................................................... 6 Field methods ........................................................................................................................................ 6 Data processing ..................................................................................................................................... 6 3. SURVEY RESULTS ...................................................................................................... 8 Acid Grassland Communities .............................................................................................................. 8 Bracken .................................................................................................................................................. 9 Dry Dwarf Shrub Heath ....................................................................................................................... 9 Wet Dwarf Shrub Heath Communities ............................................................................................. 10 Blanket Bog Communities .................................................................................................................. 11 Acid/Neutral Flush Communities ...................................................................................................... 12 Notable species .................................................................................................................................... 13 Groundwater Dependent Terrestrial Ecosystems(GWDTE) and Level of Importance ............... 13 4. REFERENCES ............................................................................................................ 16 APPENDIX I: TARGET NOTES .......................................................................................... 17 APPENDIX II: VEGETATION MAPS .................................................................................. 19 _________________________________________________________________________ 3 Northern Ecological Services, Aboyne September 2013 Gordonbush Extension Wind Farm Appendix 8.1a Environmental Statement Phase 1 and NVC Report 1. INTRODUCTION Background 1.1 This report presents the results of a National Vegetation Classification survey (NVC) of the proposed Gordonbush Extension Wind Farm site carried out during August 2013. Aims & Objectives 1.2 The aims of the survey were to map the semi-natural communities within the boundary of the Core Development Area (Fig. 1) to National Vegetation Classification (NVC) (Rodwell 1991a, 1991b, 1992, 1995) level with accompanying habitat maps, quadrat data and target notes illustrating the distribution and extent of each community over the site. A habitat map utilising the Phase 1 Habitat Survey system (JNCC 2007) has also been produced. This will beused to inform the potential environmental impacts of the proposed Development particularly on Ground Water Dependent Terrestrial Ecosystems (GWDTEs). Topography 1.3 The 4.47 km² site comprises gently sloping upland plateau rising with ground elevations ranging from approximately 150m Above Ordnance Datum (AOD) in the south-west of the site to approximately 330m AOD in the north-east of the site. It is situated between the Allt a’ Mhuilinn and Allt Smeorail rivers, small tributaries of which drain the site, including the Allt nan Nathraichean. The ground is characterised by level blanket peats, shallow valleys and small hillocks supporting drier heathland vegetation. Geology and soils 1.4 The majority of the site is underlain by the Kildonan Psammite Formation composed of psammite and micaceous psammite (British Geological Survey). Soils are strongly acidic Glacial Till and peats. Land use 1.5 The site is grazed by deer. Blanket bog on the site has been historically drained and cut for peat and, more recently (c. 10 years ago), burnt due to a heather beetle outbreak. Survey limitations 1.6 Burning in some areas of the site has modified the species composition of the communities and has blurred community boundaries. This has made assignation of a definitive NVC community difficult in some areas, with some communities only showing loose associations with the published tables. _________________________________________________________________________ 4 Northern Ecological Services, Aboyne September 2013 Gordonbush Extension Wind Farm Appendix 8.1a Environmental Statement Phase 1 and NVC Report Fig 1: The Core Development Area _________________________________________________________________________ 5 Northern Ecological Services, Aboyne September 2013 Gordonbush Extension Wind Farm Appendix 8.1a Environmental Statement Phase 1 and NVC Report 2. METHODOLOGY Field methods 2.1 The surveyor walked over the site to identify all the vegetation communities present within the survey area and pick out any features of special interest. Homogenous stands of vegetation were identified and mapped onto a 1:10,000 field map,underlain by aerial photos. 2.2 Where intricate mosaics of vegetation types were encountered, the approximate proportion of each community was noted as a percentage of total cover. A target note was used to describe areas of vegetation too small to map, typically less than 0.2 ha. 2.3 Quadrat data were taken for communities of high conservation interest or where there was difficulty assigning a community in the field. Quadrats and target notes (latter given in Appendix I) were recorded using a hand held GPS device. Sample size was based on a 2m by 2m quadrat. Species were recorded using the DOMIN scale in accordance with Rodwell et al. (1991). Domin score Percentage ground cover 10 91-100% 9 76-90 8 51-75 7 34-50 6 26-33 5 11-25 4 4-10 3 many individuals 2 <4 several individuals 1 few individuals 2.4 Photographs were taken to highlight important habitats or habitat features which may be affected by the Development. Data processing 2.5 Data processing involves converting the information recorded in the field into descriptive text, digitised maps and NVC community tables. Converting the field map information into ArcView shape files creates a digitised NVC polygon map. This is typically achieved by redrawing the field maps onto digital maps
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