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 81
... environmental factors change . With the J - curve there is the same initial rapid population increase but levelling off is not seen . Instead , the species meets sudden environmental resistance and population numbers plunge almost back ...
... environmental factors change . With the J - curve there is the same initial rapid population increase but levelling off is not seen . Instead , the species meets sudden environmental resistance and population numbers plunge almost back ...
Page 94
... environmental factors . We may define an ecological factor as one having an influence , maybe decisive , on the presence , absence or performance of a species . This very broad definition reflects the fact that there may be almost ...
... environmental factors . We may define an ecological factor as one having an influence , maybe decisive , on the presence , absence or performance of a species . This very broad definition reflects the fact that there may be almost ...
Page 95
... environmental phenomena which , in the phrase of Mason and Langenheim , are not ' operationally significant ' . - - Difficult though it is to measure precisely the response of plants to ecological factors , this knowledge , apart from ...
... environmental phenomena which , in the phrase of Mason and Langenheim , are not ' operationally significant ' . - - Difficult though it is to measure precisely the response of plants to ecological factors , this knowledge , apart from ...
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