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 28
... chemicals in solution ) and gaseous ( atmospheric gases and those released by chemical and biological activity within the soil ) . It results from three processes of weathering . Physical weathering is brought about by the action of ...
... chemicals in solution ) and gaseous ( atmospheric gases and those released by chemical and biological activity within the soil ) . It results from three processes of weathering . Physical weathering is brought about by the action of ...
Page 47
... Chemical properties ( the percentage chemical composition of the rock . Do they have sufficient reserves of the main macronutrients and are essential trace elements present ? Are the chemicals found in forms readily available for plant ...
... Chemical properties ( the percentage chemical composition of the rock . Do they have sufficient reserves of the main macronutrients and are essential trace elements present ? Are the chemicals found in forms readily available for plant ...
Page 141
... chemical approaches . Chemical pesticides and herbicides are costly to produce and dosages may need to be repeated frequently . Resistance to chemicals soon builds up : about half the known pests in the world are now resistant to at ...
... chemical approaches . Chemical pesticides and herbicides are costly to produce and dosages may need to be repeated frequently . Resistance to chemicals soon builds up : about half the known pests in the world are now resistant to at ...
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