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Spruce - an ice age survivor ?

Spruce – an ice age survivor ?

by Chris ~ 30 March, 2012 ~ Comments Off on Spruce – an ice age survivor ?

There have been many ice ages in the history of the Earth; but the last, which covered vast tracks of the Northern Hemisphere, came to an end some nine to ten thousand years ago – when the temperature (and sea level) rose.  It has always been assumed that no trees survived in the regions covered by the thick ice sheet, and that trees (like other plants) have returned to areas like Scandinavia by the gradual northern migration of species that had taken ‘sanctuary’ in warmer latitudes.

However, recently work has been undertaken by Read more...

Sitka Spruce Surprises

Sitka Spruce Surprises

by Angus ~ 9 August, 2010 ~ 3 comments

About 70% of Britain's commercial tree plantations are Sitka Spruce.  The Forestry Commission have been planting sitka since as far back as the 1930s both because it is able to survive in inhospitable peaty conditions and because sitka grows fast and produces good quality timber.  Botanically called Picea sitchensis, sitka spruce is most easily identified by the "three p's": it has a pointed crown, its leaves (needles) are on pegs and it has pendant cones. Read more...

pine forest New York State

Bark Beetles

by Chris ~ 8 May, 2010 ~ 4 comments

In and around the Rocky Mountains, the wholesale destruction of vast areas of pine forests is occurring.  The annihilation of these forests is due to a beetle – the Bark Beetle, which devours the soft tissues underneath the bark. The beetle is quite small, bit like a grain of rice.  Vast tracks of forests have been ‘lost’ to this beetle; it has been estimated that some six million acres have been affected in the United States, and even greater areas in Canada, especially in British Colombia, where many more million of acres may be lost. Read more...

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