Discuss the Relative Importance of Physical and Human

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Discuss The Relative Importance Of Physical And Human Factors In Accounting For Changes To Vegetation Over Time With Ecosystems In The British Isles [40] In the British Isles there are many different ecosystems in which the vegetation changes over a period of time. These changes are due to both human and physical factors. The ecosystems which I will look at that have been affected by these factors are: Temperate deciduous woodlands, Psammoseres and heather moorlands. I will use many case studies the show the effects of human and physical factors on the ecosystems named. In temperate deciduous woodland there are both human and physical factors which account for the change to vegetation over time within the ecosystem. The main human factors are for timber supply and recreation. Pollarding is a method that is used to manage woodland. This involves the trees to be shoulder height above the level of browsing by animals such as deer. By pollarding trees at this height it means that the tree is able to survive and therefore can carry on to row and supply wood. This means that the growing of the species can continue until its reaches its climax of oak and elm trees, rather than the whole tree being cut down completely and being forced into a plagioclimax where small trees like rowan and hawthorn are the dominant species. However some temperate deciduous woodlands have been cut down for recreational purposes, an example of this is Epping Forest where a large amount of the forest has been cut down to home 60 football pitches. This means that the forest has not been able to climax naturally and so has meant that there is in fact a plagioclimax, with the dominating species being grass. This is the first stage of the temperate deciduous woodland biome and would mean that the area would have to be left untouched for many years for the succession to happen. However in order to

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