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Layer: Core Woodlands (ID:0)

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Name: Core Woodlands

Display Field: DESCRIPTOR

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: SUMMARY This dataset is the result of work carried out by Forestry Commission Scotland and Forest Research to produce data showing potential native woodland networks, to help focus native woodland expansion, improvement and restoration. The network data are based around core areas of woodland which are derived from various national datasets using the following characteristics: - ancient woods & long-established woods (both from the Scottish Ancient Woodland Inventory), - woods on designated sites, - Caledonian Pinewoods Inventory woods, - semi-natural woods, as estimated from the Scottish Semi-natural Woodlands Inventory (SSNWI). The analysis included all SSNWI areas with over 80% semi-natural canopy structure and with canopy cover of at least 20%. Around the core areas two potential expansion zones have been defined using the BEETLE modelling tool developed by Forest Research. The zones are for: - slow coloniser species (250m network) such as ancient woodland plants, - moderate colonisers (1000m network), which include a wide range of woodland plant and invertebrate species. The potential expansion zones suggest where locating new native woods would best develop ecological connection to core woods. They indicate the predicted maximum distances at which a new native wood planted today would be expected to be successfully colonised by a range of characteristic woodland species dispersing from the nearest core woodland, over a period of around 50-100 years. Crucially, this is the period over which we will need to develop functioning networks to help species adapt to rapid climate change (para.8). The zone widths vary according to the land use and habitat type next to the core woodland. The model assumes that the maximum colonisation rates (250m or 1000m) will occur only where the newly planted wood is connected to the core network area by planted native woodland, since this most closely resembles the preferred semi-natural woodland habitat. If the new wood is separated from the core woodland by an unwooded area, woodland species will need to cross this less suitable habitat to colonise the new native wood, and so colonisation rates and expansion zone widths are reduced. The zones are narrowest where arable or brownfield land are the intervening land use types. The core areas are based on the best current indicators of high nature conservation value that are available as datasets right across Scotland. However as some datasets are up to 20 years old, the data need to be treated as approximate. DATA LINEAGE Landcover data The landcover matrix dataset prepared for the Forest Habitat Networks project was used as the starting point for this work (Moseley et al, 2005). The data is a combination of LCS88, LCM2000 and Ordnance Survey Strategi®. The following habitat types were removed from the analysis as they will not be available for woodland expansion: open habitat designations, urban areas and water. The analysis used the 'generic focal species' approach (Eycott et al. 2007) from the accumulated cost distance tool from the suite of tools within the BEETLE model (Watts et al, 2005) to model networks of functionally connected woodland areas based on assumptions about the permeability of the landscape to dispersal by a range of species. Two sets of habitat networks have been modelled: * A broad forest habitat network based on a 1km maximum dispersal. These are based on core areas of high conservation value woods mapped from one or more of the following datasets: National Inventory of Woodlands and Trees (NIWT) woodland within a designated site, Caledonian Pinewoods Inventory (CPI) core or planted areas, ancient woodland, Plantations on Ancient Woodland Sites (PAWS), Long-established woods of Planted Origin (LEPO), and areas from the Scottish Semi-natural Woodlands Inventory (SSNWI) with over 80% naturalness and canopy cover over 20%, (Ray and Grieve, 2006). The 1km maximum distance is suited to species with moderate colonising ability. * A narrow forest habitat network with core areas as above, and a 250metre maximum dispersal. This network is more suited to woodland species with slow colonising ability. The relative permeability values assumed for each landcover type for both the 1km and 250m networks were the same. ATTRIBUTES N.B. The view of the data available to internal Forestry Commission staff via the FCS Map Browser is built up from two separate datasets, S_FHN_CORE and S_FHN_TARGETS. The attributes from each dataset are given below. However, external users viewing this data in GIS software should be aware that two separate datasets are required to give this view of the data. S_FHN_TARGETS: ExpZone : (Expansion Zone) - Either "250m max" or "1km max" S_FHN_CORE: Descriptor : Core Area Please ensure that the following acknowledgement is displayed on any hard copy: © Crown copyright and database right 'year'. Ordnance Survey Licence number 100021242.

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Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

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Last Edit Date: 5/16/2024 5:34:48 PM

Schema Last Edit Date: 5/16/2024 5:34:48 PM

Data Last Edit Date: 5/16/2024 5:34:48 PM

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