Page:A primer of forestry, with illustrations of the principal forest trees of Western Australia.djvu/27

21 the temperature of the air. While the reason for the equalising effect of the forests on the temperature has not been fully explained, it would seem to be due to the blanketing effect of the branches and tips, which shelter the soil from the heat



Karri on Trucks ready for powellising.

of the sun. If temperatures are taken from the ground upwards to the crowns of the trees, then the effect of the forest is more noticeable near the ground than in