Estimating the extent and change in Broad Habitats in Great Britain
Howard, D. C.; Watkins, J. W.; Clarke, R. T.; Barnett, C. L.; Stark, G. J.. 2003 Estimating the extent and change in Broad Habitats in Great Britain. Journal of Environmental Management, 67 ((3) special issue). 219-227. 10.1016/S0301-4797(02)00175-5Full text not available from this repository.
A stratified random sample of kilometre squares in Great Britain was visited and completely mapped using four areal themes (agriculture and semi-natural vegetation, forestry, physiography and buildings and communications). The maps were digitised and the attribute information recorded to produce an electronic database. Information was summarised by square and then bootstrap re-sampling techniques were used to produce national estimates with statistical confidence intervals. The results for 1998 showed the terrestrial Broad Habitats had a range in extent covering two orders of magnitude from Montane (49 000 ha) to Improved Grassland (5482 000 ha). Just under half of Britain is covered by agricultural Broad Habitats, about 12% by woodland and just under 10% by Urban Habitats. The remaining quarter of the land area is covered by semi-natural Broad Habitats. By revisiting the same sample of squares previously visited in 1990, changes in the quantity and quality of the Broad Habitats have been determined. Significant increases in area have occurred in the Broadleaved, Mixed and Yew Woodland and Built Up and Gardens. The largest areal reduction was in Acid Grassland although that was in part balanced by a gain in Fen, Marsh and Swamp. The most significant ecological loss was in the area of Calcareous Grassland. The consequences of having different sample sizes for the different years are discussed.
|Programmes:||CEH Programmes pre-2009 publications > Other|
|CEH Sections:||_ River Ecology
_ Ecosystem Assessment & Forecasting
_ Environmental Chemistry & Pollution
|Additional Keywords:||broad habitat, Great Britain, Countryside Survey 2000, CS2000, change 1990–1998, Bootstrap|
|NORA Subject Terms:||Ecology and Environment
Data and Information
|Date made live:||29 Oct 2008 10:59|
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