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 72
... various parts of ecology within a single conceptual framework . This framework is provided by the ecosystem concept . Hall and Fagen define a system as a set of objects together with the relationships between those objects and between ...
... various parts of ecology within a single conceptual framework . This framework is provided by the ecosystem concept . Hall and Fagen define a system as a set of objects together with the relationships between those objects and between ...
Page 147
... various crops in the United States ( From Conway , 1975 after Rudd ) Yield per acre Cost of treatment Net gain Crop Seed cotton Pea seed Tomatoes Sugar beets Pest Untreated Treated ( $ per acre ) ( $ per acre ) Bollworm Fungi Diseases ...
... various crops in the United States ( From Conway , 1975 after Rudd ) Yield per acre Cost of treatment Net gain Crop Seed cotton Pea seed Tomatoes Sugar beets Pest Untreated Treated ( $ per acre ) ( $ per acre ) Bollworm Fungi Diseases ...
Page 156
... various forms of disturbance by man , such as agriculture and the introduction of exotic species , have sadly reduced a once more or less continuous cover of natural vegetation to mere fragments , many of which at best only enjoy a semi ...
... various forms of disturbance by man , such as agriculture and the introduction of exotic species , have sadly reduced a once more or less continuous cover of natural vegetation to mere fragments , many of which at best only enjoy a semi ...
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