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Politics : PRESIDENT GEORGE W. BUSH
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To: Kevin Rose who wrote (735582)4/5/2006 9:39:20 PM
From: ManyMoose  Read Replies (1) of 769670
 
My empirical judgment figured it out. Same soil, slope and environmental conditions, live trees everywhere but right in the cold sink.

The real kicker was going out in the field on a clear morning after a frosty night. Frost gone everywhere but in the cold sink. Frost still visible in the sink. New buds withered by the frost on trees in the cold sink, but not elsewhere. That sort of thing.

One day I was out on such a day. I had two silvicultural treatments side by side on one of these things. One was a clearcut -- frost killed seedlings everywhere, over many years. The other was a shelterwood cut, which, as you might expect, left a percentage of shelter trees from the original stand sufficient to provide shelter for the new seedlings.

Frost in the clearcut was about two inches thick. Frost in the shelterwood cut was maybe half an inch.

The difference was reradiation of ground heat reflected back by the shelter trees. In the clearcut, ground heat just went out into space.

That was a huge epiphany for me. It drove home the importance of someone in my profession to go out in the field every day possible, under all conditions. My employer never did quite grasp that aspect of the job, unfortunately.

Thanks for the intelligent question.
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