INFLUENCES OF MICROCLIMATES ON MORTALITY AND GROWTH OF PLANTED WHITE SPRUCE, JACK PINE AND WHITE PINE

Relationships between some microclimatic factors and mortality and growth of planted conifers were studied on the north and south aspects of a ridge in Eastern Ontario. It is shown that interactions between meteorological and physiographic factors complicate the classification of local climate for plantation purposes. Correlations between mortality of jack pine and white spruce and maximum temperature, and between height growth of white pine and mean temperature of the previous summer are suggestive rather than conclusive.