Basic Biogeography |
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Page 166
The vegetation was essentially ' Arctic ' in character ; an open , stunted growth of
mosses , lichens , sedges , grasses and dwarf birch . The name of this division is
derived from the widespread occurrence in deposits of remains of Dryas ...
The vegetation was essentially ' Arctic ' in character ; an open , stunted growth of
mosses , lichens , sedges , grasses and dwarf birch . The name of this division is
derived from the widespread occurrence in deposits of remains of Dryas ...
Page 182
South of this line birch and , to a lesser extent , alder have been equally or more
important trees . Small woodlands of birch ( of both Betula pubescens and Betula
pendula ) occur extensively and are the commonest natural woodland type ...
South of this line birch and , to a lesser extent , alder have been equally or more
important trees . Small woodlands of birch ( of both Betula pubescens and Betula
pendula ) occur extensively and are the commonest natural woodland type ...
Page 190
Ants spend much of the day in the litter or on the trees and , together with the
flocks of small insectivorous birds which frequent the forest , probably prevent
massive pest outbreaks . acci 10 Regeneration of pine and birch ...
Ants spend much of the day in the litter or on the trees and , together with the
flocks of small insectivorous birds which frequent the forest , probably prevent
massive pest outbreaks . acci 10 Regeneration of pine and birch ...
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Contents
Introduction | 3 |
Plant dynamics and the nature of vegetation | 50 |
Ecosystems | 89 |
Copyright | |
3 other sections not shown
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Common terms and phrases
acidic activities agricultural animals approach areas associated become birch Britain British brown cause changes chemical Class clay climatic complex cover crop cycle described detailed determine dominant early ecological ecosystem effect energy environment environmental established example exist factors field fire flora forest frequently further gley grass grazing ground growing growth horizon humus important increase influence insect land layer less limit loss material measure methods mountain native natural nutrients oakwoods occur operate organic particularly pattern peat period pest pine plant podzol pollen population present problem produce reach recent reference region relatively result seedlings similar slopes soil species spread stage stands structure succession surface Table tree tree-line types unit upland usually variations various vegetation whilst wood woodland zone