Basic Biogeography |
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Page 79
... increase homeostasis , providing more and more protection for the members of the community from external environmental change . As an undisturbed ecosystem matures , there is increased symbiosis between species and many specialized ...
... increase homeostasis , providing more and more protection for the members of the community from external environmental change . As an undisturbed ecosystem matures , there is increased symbiosis between species and many specialized ...
Page 80
... increasing evidence for the fragility of Tropical Rain Forest ecosystems , especially when disturbed by man . The ... increase ) in another value . Predator - prey relationships contain a strong element of negative feedback . Positive ...
... increasing evidence for the fragility of Tropical Rain Forest ecosystems , especially when disturbed by man . The ... increase ) in another value . Predator - prey relationships contain a strong element of negative feedback . Positive ...
Page 212
... increase slightly the organic content of the B horizons or zones of illuviation . The surface mor is strongly acid , pH 4 or less , but the lower layers show an increase in value towards about pH 5.5 . Podzols will readily form under ...
... increase slightly the organic content of the B horizons or zones of illuviation . The surface mor is strongly acid , pH 4 or less , but the lower layers show an increase in value towards about pH 5.5 . Podzols will readily form under ...
Contents
Introduction | 3 |
Initial approaches to vegetation study | 11 |
Initial approaches to soil study | 28 |
Copyright | |
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acidic agricultural animals approach areas become biogeography biotic birch Britain British Isles brown earths Cairngorm Cairngorm Mountains Calluna changes chemical clay climatic climax community climax vegetation complex conservation coypus crop cycle deciduous deer dominant Ecol ecologists ecosystem energy environment environmental erosion example fire forest Forestry Forestry Commission gley soils grass grazing ground flora growth heather herbivores horizon humus important increase influence insect land landscape layer leached lichen litter methods mineral moorland moors mountain native natural nutrients oakwoods occur organic parent material pattern peat pedogenic pest pine pinewood Pinus plagioclimax plant communities plant cover podzol pollen population present produce quadrat Quercus recent regeneration region sample Scotland Scots pine Scottish Highlands seedlings shrubs slopes soil types stage structure surface Table temperature timber-line tree-line upland usually variations vegetation whilst wood woodland zone