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Extra resources for Reflective practice in geography teaching

Example text

Third, straight channels are uncommon in nature whereas meandering channels are frequently the equilibrium channel form. Natural channel patterns reflect an adjustment to the prevailing catchment characteristics and if we attempt to control channel pattern and put the river in a straitjacket of channel reinforcements, there will be knock-on effects. Fourthly, because each section of river is part of a channel network, impacts can be transmitted far beyond the modified reach throughout the river system in both upstream and downstream directions and therefore have far-reaching consequences.

Over the life of the succession a number of different vegetation communities develop, peak and die. Each stage in the succession is called a sere. So a succession is a collection of seres. In theory a sere that does not change will eventually develop. This final sere is called a climax community. The early ecologists were mainly plant ecologists. They were much exercised by the theory that eventually there would be a vegetation community that would develop as a reflection of climate conditions in each part of the world.

In ponds and small shallow lakes a period of sedimentation my have to take place before the initial floating aquatic vegetation gives way to rooted aquatics. Such rooted aquatics serve to trap debris and accelerate the process of deposition. As the water shallows and a layer of thicker ‘soil’ develops species tolerant of saturated conditions, such as willow, emerge and may start to shade out some of the rooted aquatics, but the additional water use by the trees and the additional litter and wind-borne trapped debris will further modify ground conditions to the point where the willow cannot regenerate and a species more adapted to drier conditions will dominate.

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