Bedfordshire Himalayan Balsam Surveys (WT) - 2010-2012
Field surveys in the River Flit Valley were undertaken during the summers of 2010 to 2012 to map the distribution and abundance of Himalayan Balsam (Impatiens glandulifera). Where none was found this was recorded, in addition to three levels of abundance low, medium and high).
The River Flit valley within Bedfordshire (VC30).
To record distribution and abundance in order to plan and monitor eradication efforts of the invasive alien species.
High. Species is relatively easy to identify and only three surveyors performed the field work. Interpretation of the resulting field maps means some uncertain about the abundance in some specific 10m squares, but the overall picture is very representative of the region. Data have been checked with NBN Record Cleaner.
Paper maps were completed in the field and these were georeferenced and captured in GIS into a 10m grid as quantity, date and surveyor. 10m grid references were assigned to each square. Each bank of a water course was independently captured. Records adjacent to water courses are identified with a Position of DownStreamLeft or DownStreamRight and those away from flowing water are labelled OffStream. Quantity is recorded as Dominant, Frequent, Occasional or None.
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Metadata last updated on 2017-06-18 07:08:02.0