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Observational analysis shows decreased tree height on south slopes in yellow-poplar, indicating terrain influence on growth patterns.
Ten years after being planted, yellow-poplars on the southern end of the Cumberland Plateau were tallest in moist, well-drained bottoms. Tree height decreased with position up the slope at a greater rate on south than on north slopes. At least 70 percent of the trees survived on all but middle and upper south slopes.
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Glendon W. Smalley (1969) studied this question.
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