Sitka spruce

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