AGR 2320 Lecture Notes - Outwash Plain, Soil Structure, Sustainable Organic Integrated Livelihoods
12 Jan 2013
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Document Summary
You can reach an endpoint of weathering where soil is one large horizon (can be found in the tropics) The problem with well weathered" soils is that it has little productivity. Therefore, when you cut down a tropical forest the result is very productive soil for a very short period of time. Once the organic litter layer is used up, the soil has nothing to offer. Source of photosynthetic carbon contributes to weathering, development of soil structure. Amt of precipitation determined by climate; water is the primary tool of weathering. Materials deposited in lakes and then exposed (glacio-lacustrine) Deposited directly by the ice (terminal morane, drumlin) Particularly important in canada due to relevant glacial periods. Terminal moraines mark the end of a glacier; several may run in arcs and mark former positions of a glacier front. Not all former ice fronts are marked by terminal moraines; some may have been destroyed by meltwater. http://www. landforms. eu/cairngorms/moraine%20terminal. htm.
