Basic Biogeography |
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Page 160
... pollen grain is highly resistant to decay . Providing the pollen grain becomes incorporated in sediments which are forming under acidic , anaerobic ( oxygen - free ) conditions , it will persist in a clearly identifiable form for many ...
... pollen grain is highly resistant to decay . Providing the pollen grain becomes incorporated in sediments which are forming under acidic , anaerobic ( oxygen - free ) conditions , it will persist in a clearly identifiable form for many ...
Page 161
... pollen grains on record sheets for each sample , the species are usually grouped into similar types , as shown in Table 8.1 . The count proceeds until 150 arboreal pollen grains ( AP ) have been recorded , by which time maybe many ...
... pollen grains on record sheets for each sample , the species are usually grouped into similar types , as shown in Table 8.1 . The count proceeds until 150 arboreal pollen grains ( AP ) have been recorded , by which time maybe many ...
Page 164
... Pollen diagram for Hockham Mere , Norfolk . ( a ) The tree pollen curves , showing early dominance by birch and pine woodland followed by the arrival of deciduous forest elements at about the 600 cm level . The sharp increase in alder ...
... Pollen diagram for Hockham Mere , Norfolk . ( a ) The tree pollen curves , showing early dominance by birch and pine woodland followed by the arrival of deciduous forest elements at about the 600 cm level . The sharp increase in alder ...
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