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 60
... relative density , relative dominance ( determined by measuring the basal area of the species , i.e. the ground area ... relatively simple . Vegetation stands are plotted with the continuum index as the x - axis and an environmental ...
... relative density , relative dominance ( determined by measuring the basal area of the species , i.e. the ground area ... relatively simple . Vegetation stands are plotted with the continuum index as the x - axis and an environmental ...
Page 75
... relatively short . The ratio of gross photosynthesis to community respiration ( the P / R ratio ) is high in a pioneer ecosystem , but as succession proceeds towards the climax community it becomes low , approaching a value of unity ...
... relatively short . The ratio of gross photosynthesis to community respiration ( the P / R ratio ) is high in a pioneer ecosystem , but as succession proceeds towards the climax community it becomes low , approaching a value of unity ...
Page 234
... relatively pervious Cg horizon affected by free groundwater 8. Ground - water gley soils With distinct , humose or peaty topsoil and diagnostic gleyed horizon at less than 40 cm , in recent alluvium ripened to more than 20 cm , and / or ...
... relatively pervious Cg horizon affected by free groundwater 8. Ground - water gley soils With distinct , humose or peaty topsoil and diagnostic gleyed horizon at less than 40 cm , in recent alluvium ripened to more than 20 cm , and / or ...
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