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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.
Sitka spruce 2000
Sitka spruce 2001
Sitka spruce 2002
Sitka spruce 2003
Sitka spruce 2004
Sitka spruce 2005
Sitka spruce 2006
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