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 208
... humus soils , like many raw soils , have never been forested in this country . They are usually deficient in nutrients and strongly acidic . At some sites , such as in the Cairngorms , the poorly decomposed humus layer can be rolled ...
... humus soils , like many raw soils , have never been forested in this country . They are usually deficient in nutrients and strongly acidic . At some sites , such as in the Cairngorms , the poorly decomposed humus layer can be rolled ...
Page 209
Nigel Pears. ( a ) Forest podzol Ao Litter A1 Mor humus ( b ) Nanopodzol ( c ) Podzol ranker ( Alpine humus soil ) A2 Leached sandy gravel B1 Iron staining 17 2 consisting of raw humus directly overlying the parent material . mid ...
Nigel Pears. ( a ) Forest podzol Ao Litter A1 Mor humus ( b ) Nanopodzol ( c ) Podzol ranker ( Alpine humus soil ) A2 Leached sandy gravel B1 Iron staining 17 2 consisting of raw humus directly overlying the parent material . mid ...
Page 211
... humus : surface pH values of 5-6.5 increase with depth to about neutrality . The profile does not show strong contrasts into distinct mineral horizons with sharp boundaries and there is no tendency for sub - surface layers to form which ...
... humus : surface pH values of 5-6.5 increase with depth to about neutrality . The profile does not show strong contrasts into distinct mineral horizons with sharp boundaries and there is no tendency for sub - surface layers to form which ...
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