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 140
... insect to an outside source of synthetic juvenile hormone which arrests development , thereby preventing the onset of sexual maturity . Until recently , it was thought that these techniques were highly specific but McNeil produces ...
... insect to an outside source of synthetic juvenile hormone which arrests development , thereby preventing the onset of sexual maturity . Until recently , it was thought that these techniques were highly specific but McNeil produces ...
Page 143
... insect which first develops on nearby blackberry patches . On these ' weeds ' the parasite overwinters on another species of leafhopper . By early spring the parasite is thus quite abundant and able to invade the vines , effectively ...
... insect which first develops on nearby blackberry patches . On these ' weeds ' the parasite overwinters on another species of leafhopper . By early spring the parasite is thus quite abundant and able to invade the vines , effectively ...
Page 144
... insect populations , leading to sudden pest outbreaks , include : 1. The clearance of forest land for crop cultivation , resulting in a vast invasion of the cleared areas by insects adapted to open , drier terrain . This occurred with ...
... insect populations , leading to sudden pest outbreaks , include : 1. The clearance of forest land for crop cultivation , resulting in a vast invasion of the cleared areas by insects adapted to open , drier terrain . This occurred with ...
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