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 76
... flow and trophic structure of an abandoned field ecosystem in Michigan , USA shown in a quantitative form . The field was left more or less undisturbed from 1942. The energy flow through the food chain is for the period May 1956 to May ...
... flow and trophic structure of an abandoned field ecosystem in Michigan , USA shown in a quantitative form . The field was left more or less undisturbed from 1942. The energy flow through the food chain is for the period May 1956 to May ...
Page 91
... flows towards the more mature sub - system , and the boundary or surface of equal maturity shows a trend to move in an opposite direction to such an energy flow ' . He states this applies not only to ecosystems but also to human social ...
... flows towards the more mature sub - system , and the boundary or surface of equal maturity shows a trend to move in an opposite direction to such an energy flow ' . He states this applies not only to ecosystems but also to human social ...
Page 110
... flow . Gloyne has shown that even a narrow belt of trees can effect a noticeable reduction of wind flow . With a medium - density tree barrier ( 50 % ) wind reduction at horizontal distances beyond the barrier equal to 3h to 5h ( where ...
... flow . Gloyne has shown that even a narrow belt of trees can effect a noticeable reduction of wind flow . With a medium - density tree barrier ( 50 % ) wind reduction at horizontal distances beyond the barrier equal to 3h to 5h ( where ...
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