Basic Biogeography |
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Page 30
... organic material becomes well mixed in with the mineral fraction . A2 - leached layer ; percolating water has removed some mineral and organic particles to lower levels . The zone is often grey in colour due to loss of clay , iron or ...
... organic material becomes well mixed in with the mineral fraction . A2 - leached layer ; percolating water has removed some mineral and organic particles to lower levels . The zone is often grey in colour due to loss of clay , iron or ...
Page 73
... organic substances in the cells of the autotrophs . 2. The heterotrophic ( other - feeding ) component , which is essentially concerned with using , rearranging and decomposing complex organic substances made available by the ...
... organic substances in the cells of the autotrophs . 2. The heterotrophic ( other - feeding ) component , which is essentially concerned with using , rearranging and decomposing complex organic substances made available by the ...
Page 214
... Organic Soils The Soil Survey define organic soils as those with a surface layer more than 38 cm ( 15 in ) thick containing at least 30 per cent organic matter . Soils which just fall short of this criterion are described by the use of ...
... Organic Soils The Soil Survey define organic soils as those with a surface layer more than 38 cm ( 15 in ) thick containing at least 30 per cent organic matter . Soils which just fall short of this criterion are described by the use of ...
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