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 30
... zone is often grey in colour due to loss of clay , iron or aluminium and the concentration here of quartz and other resistant minerals . - Horizons Ao , A1 and A2 are subject to removal of organic material , fine clay particles and ...
... zone is often grey in colour due to loss of clay , iron or aluminium and the concentration here of quartz and other resistant minerals . - Horizons Ao , A1 and A2 are subject to removal of organic material , fine clay particles and ...
Page 96
Nigel Pears. 5. A zone where the yellowish , broad - lobed foliose lichen , Parmelia caperata appears ( at about 20 miles from the city centre on the south , 50 miles to the north ) . 6. A zone with two smooth , grey foliose lichens ...
Nigel Pears. 5. A zone where the yellowish , broad - lobed foliose lichen , Parmelia caperata appears ( at about 20 miles from the city centre on the south , 50 miles to the north ) . 6. A zone with two smooth , grey foliose lichens ...
Page 193
... zones above the forest edge ( Fig . 8.22 ) : the Calluna zone , the Empetrum - Vaccinium zone and the Juncus zone ( and snow - patch vegetation ) . The topographic complex influences this altitudinal zonation to give interdigitation of ...
... zones above the forest edge ( Fig . 8.22 ) : the Calluna zone , the Empetrum - Vaccinium zone and the Juncus zone ( and snow - patch vegetation ) . The topographic complex influences this altitudinal zonation to give interdigitation 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 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