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 102
... growth . Only recently has refined research isolated a probable mechanism to explain alpine tree limits . The early theories may be briefly stated as follows : 1. Excessive light . The increase in light intensity with altitude was ...
... growth . Only recently has refined research isolated a probable mechanism to explain alpine tree limits . The early theories may be briefly stated as follows : 1. Excessive light . The increase in light intensity with altitude was ...
Page 175
... growth energy then became concentrated into the fewer remaining buds which thus elongated rapidly to form ' lammas shoots ' . Many of these shoots in turn will be killed by the frosts of the next winter ; those surviving produce more ...
... growth energy then became concentrated into the fewer remaining buds which thus elongated rapidly to form ' lammas shoots ' . Many of these shoots in turn will be killed by the frosts of the next winter ; those surviving produce more ...
Page 181
... growth and survival . Climatic , edaphic and biotic factors influence this stage . The main climatic variable of importance seems to be the light factor . At low light levels , for example under dense parental shade , mildew growth is ...
... growth and survival . Climatic , edaphic and biotic factors influence this stage . The main climatic variable of importance seems to be the light factor . At low light levels , for example under dense parental shade , mildew growth is ...
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