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Vegetation survey reveals lowland brush emerges from existing shrubs in logged areas, highlighting the impact of residual vegetation.
A vegetation survey in black spruce swamps and lowland brush areas in north-central Minnesota suggests that lowland brush usually develops from the vegetative reproduction of shrubs already present at the time of logging, and not by invasion from surrounding areas. To reproduce black spruce and avert succession to brush on swamps similar to those sampled, residual vegetation should be killed as soon as possible after clearcutting.
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William F. Johnston (1968) studied this question.
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