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 36
... surface of the colloidal particles has a negative charge which consequently attracts to it the cations . Around each such particle will be held great clusters of cations . The strength by which these cations are held by the colloidal ...
... surface of the colloidal particles has a negative charge which consequently attracts to it the cations . Around each such particle will be held great clusters of cations . The strength by which these cations are held by the colloidal ...
Page 214
... surface . This causes waterlogging of the upper horizons and ground surface in wet seasons . Characteristic rusty mottlings are seen in the upper zones and the sub - soil layers show grey or orange blotches . Ground - water gley soils ...
... surface . This causes waterlogging of the upper horizons and ground surface in wet seasons . Characteristic rusty mottlings are seen in the upper zones and the sub - soil layers show grey or orange blotches . Ground - water gley soils ...
Page 224
... surface . It was thus envisaged that soils , by an entirely natural process , might pass from a skeletal ( raw soils ) ... surface drainage is impeded because of textural changes in the lower soil profile which may lead to pan development ...
... surface . It was thus envisaged that soils , by an entirely natural process , might pass from a skeletal ( raw soils ) ... surface drainage is impeded because of textural changes in the lower soil profile which may lead to pan development ...
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