Basic Biogeography |
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Page 166
... birch . The name of this division is derived from the widespread occurrence in deposits of remains of Dryas octopetala ( mountain avens ) . The period began about 13000 B.P. Alleröd Period . This period , named after a Danish site , was ...
... birch . The name of this division is derived from the widespread occurrence in deposits of remains of Dryas octopetala ( mountain avens ) . The period began about 13000 B.P. Alleröd Period . This period , named after a Danish site , was ...
Page 182
... birch and , to a lesser extent , alder have been equally or more important trees . Small woodlands of birch ( of both Betula pubescens and Betula pendula ) occur extensively and are the commonest natural woodland type remaining today in ...
... birch and , to a lesser extent , alder have been equally or more important trees . Small woodlands of birch ( of both Betula pubescens and Betula pendula ) occur extensively and are the commonest natural woodland type remaining today in ...
Page 190
... birch woods There is very little natural regeneration taking place in most Scottish pine and birch forests today . Ample seed is produced in a good seed year , which occurs about every 3 to 6 years . But of that which germinates only a ...
... birch woods There is very little natural regeneration taking place in most Scottish pine and birch forests today . Ample seed is produced in a good seed year , which occurs about every 3 to 6 years . But of that which germinates only a ...
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