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In page Plagioclimax community:
"The uplands of Northern England were once covered by deciduous woodland. Some heather would have been present, but in relatively small amounts. Gradually the forests were removed during the early Middle Ages for timber and fuel purposes, and to create space for agricultural activities. The soil deteriorated as a result and heather came to dominate the plant community. Sheep grazing was the major form of agriculture in the area at the time and the sheep prevented the re-growth of woodland by destroying any young saplings.[citation needed]
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