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Appraisal of Trial to Create Optimal Tower Mustard (Arabis Glabra) Habitat Though Scraping and Rotovating at the Aviation Museum Site in Woodley, Berkshire

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Appraisal of Trial to Create Optimal Tower Mustard (Arabis Glabra) Habitat Though Scraping and Rotovating at the Aviation Museum Site in Woodley, Berkshire Tower Mustard Survey 2007 Stuart Croft Appraisal of trial to create optimal Tower Mustard (Arabis glabra) habitat though scraping and rotovating at the Aviation Museum site in Woodley, Berkshire 2007 SU 7770 7299 Aviation Museum car park, Dinton Pastures Country Park, Woodley, Berkshire. Site owned and managed by Wokingham Borough Council Countryside Service Species habitat preference and distribution Tower Mustard is known from only 31 sites in the UK, with the Aviation Museum being the only one in Berkshire (Plantlife, 2004). It is classified as ‘endangered’ in the Vascular Plant Red Data List in 1995. This Biodiversity Action Plan (BAP) species has declined dramatically to only 15% of its total pre-1970 historic area (Wheeler, 1999). Tower Mustard is a biennial, seen as a low- growing basal rosette in the first year. A flower Flower spike ½ m tall spike is produced the following spring. The spike can reach 1m, with lily-like leaves wrapping round the stem topped by tiny pale yellow flowers. Tower Mustard is usually found in sunny, free-draining, drought-prone Flower spike with leaves wrapping positions. It is also a ruderal species, favouring around stem ploughed or disturbed ground which creates patches of bare earth necessary for seed germination. (Plantlife, 2004). Habitat management history This site has been historically maintained through annual mow to maintain the verges of the car park. The site management was review in 2005 when only 1/6th of the flower spikes were found, compared to around 300 known from historic records. In order to promote this ruderal species, the competitive sward and scrub was cut and removed in the winter of 05/06. To create the necessary bare patches of soil for see germination, two treatments were trialled in the cleared compartments; • Area A was rotovated • Area B was scraped with a toothed digger bucket (see map on page 3) Survey method The 2007 survey was carried out by Stuart Croft (Countryside Ranger) and volunteer Sue Griffin on 9th May 2007. The location of the flower spikes were sketched onto a basemap then transferred to the MapInfo GIS map. Tower Mustard on verge looking NE at photo location 1 Results Survey Flower Notes Surveyor year spike count Rachel 2005 50 Sanderson Trial management of rotovation and scraping in winter 2005/6 Low count was expected since the biennial only Sue Griffin & 2006 41 produces the flower spikes in the 2nd year after Stuart Croft germination. Sue Griffin & 2007 514 Stuart Croft Appraisal of habitat management The trial management has been successful, increasing the 2005 flower spike total to more than 10 fold in 2007. Area B produced 90% of the flower spikes (460) in the survey area. Therefore Area B whilst is larger, a cut & remove followed by scraping with a tooth digger bucket, appears to produce more optimal habitat for tower mustard. Rotovating may be less productive, since the sward remaining after mowing and leaf litter are incorporated into the soil structure. The is likely to steadily increase the nutrient levels producing less favourable conditions for Tower mustard, and promoting sward competition. Future management suggestions • Cut and remove sward annually • Scrape with toothed digger bucket on 5-year rotation around the 3 banks. • Remove bramble isolated bramble regrowth • Continue annual flower spike surveys to assess tower mustard population Report written by Stuart Croft, with many thanks to the volunteer surveyors Sue Griffin and Rachel Sanderson for their intrepid sunny spike surveying. For further information please contact Stuart Croft on (0118) 9342016, [email protected] Further Reading BSBI. (1996). Botanical Society of the British Isles, Vascular Plant Atlas Update Project http://www.bsbiatlas.org.uk/map_page.php?spid=2108&sppname=Arabis%20glabra& commname=Tower%20Mustard Plantlife (2004). Arabis glabra Tower Mustard Dossier http://www.plantlife.org.uk/uk/plantlife-saving-species-dossier.html Wheeler, B.R. (2000). Tower Mustard (Arabis Glabra). Report on work undertaken during 1999. Plantlife Report Number 145. Plantlife, London .
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