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The Biosphere Global Ecological Systems Analysis
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agricultural air pollution analysis approach aquatic areas assessment associated basic basis biological biomass biosphere Britain cent Chapter chemical chemical elements climax community climax vegetation components conservation value considered distribution ecological changes ecological resources ecologists effects elements energy environment environmental changes environmental gradients Environmental Impact environmental management equilibrium eutrophication evaluated evolution example extinction Figure food web geographical global gradient analysis grassland growth habitats Helliwell human identified important increasing indicator species land land-use large number lichens limiting factor major man-induced mapping National Nature Reserves natural ecosystems Nature Conservancy Council number of species Odum organisms overall oxygen patterns plants and animals population problems range recent reduced regional relationships relatively sample scale schemes secondary succession sediment soil Source spatial strategies stressed structure successional SUMMARY Table tion trees trophic level types urban variations water cycle wildlife woodland zones