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Geographical variation in crown density for oak between 2000 and 2005. White circles show the locations of plots, and figures within the circles are mean crown densities (%). Some plots are too close to be distinguished individually. The value assigned to each 20 km square was calculated from weighted averages (weight is proportional to 1/d², where d = distance) for all plots within 70 km of the 20 km square centre.
Norway Spruce 2000
Norway Spruce 2001
Norway Spruce 2002
Norway Spruce 2003
Norway Spruce 2004
Norway Spruce 2005
Norway Spruce 2006
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