Basic BiogeographyBasic considerations. Introduction. Inital approaches to vegetation study. Inital approaches to soil study. Plant dynamics and the nature of vegetation. Ecosystems. Ecological factors and environmental variations. distubed ecosystems. Selected examples from the British Isles. The vegetation. The soils. The impact of man. |
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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 141
... increased relatively . It was then discovered that birds of prey , such as the sparrow hawk , could only tolerate 20 p.p.m. of the chemical in their body tissues whilst sparrows could tolerate up to 200 p.p.m. The result was an increase ...
... increased relatively . It was then discovered that birds of prey , such as the sparrow hawk , could only tolerate 20 p.p.m. of the chemical in their body tissues whilst sparrows could tolerate up to 200 p.p.m. The result was an increase ...
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 birch Britain British Isles brown earths Cairngorm Cairngorm Mountains Calluna changes chemical clay climatic climax community climax vegetation complex 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 Highlands 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 spread stage structure surface Table temperature timber-line tree-line upland usually variations vegetation whilst wood woodland zone