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 88
... crops in Table 5.2 reveals wide variation between average yields and highest yields . This obviously reflects the different environmental conditions under which the same crop can be grown but it also points to differing management ...
... crops in Table 5.2 reveals wide variation between average yields and highest yields . This obviously reflects the different environmental conditions under which the same crop can be grown but it also points to differing management ...
Page 144
... crop cultivation , resulting in a vast invasion of the cleared areas by insects adapted to open , drier terrain ... crop was often reduced or nullified by the losses due to these new pests . Uvarov presents several important conclusions ...
... crop cultivation , resulting in a vast invasion of the cleared areas by insects adapted to open , drier terrain ... crop was often reduced or nullified by the losses due to these new pests . Uvarov presents several important conclusions ...
Page 147
... crops in the United States ( From Conway , 1975 after Rudd ) Yield per acre Cost of treatment Net gain Crop Seed cotton Pea seed Tomatoes Sugar beets Pest Untreated Treated ( $ per acre ) ( $ per acre ) Bollworm Fungi Diseases 7,203 lb ...
... crops in the United States ( From Conway , 1975 after Rudd ) Yield per acre Cost of treatment Net gain Crop Seed cotton Pea seed Tomatoes Sugar beets Pest Untreated Treated ( $ per acre ) ( $ per acre ) Bollworm Fungi Diseases 7,203 lb ...
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