Basic Biogeography |
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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 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 ...
Page 212
... humus products may increase slightly the organic content of the B horizons or zones of illuviation . The surface mor is strongly acid , pH 4 or less , but the lower layers show an increase in value towards about pH 5.5 . Podzols will ...
... humus products may increase slightly the organic content of the B horizons or zones of illuviation . The surface mor is strongly acid , pH 4 or less , but the lower layers show an increase in value towards about pH 5.5 . Podzols will ...
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 biotic birch Britain British Isles brown earths Cairngorm Cairngorm Mountains Calluna changes chemical clay climatic climax community climax vegetation complex conservation 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 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 stage structure surface Table temperature timber-line tree-line upland usually variations vegetation whilst wood woodland zone