Part 1 Basic approaches: systems modelling of soil and vegetation. Part 2 Nutrient systems - components: basic models of soil and vegetation nutrient systems the weathering input the atmospheric input the leaching output nutrient cycling. Part 3 Nutrient systems - models of whole systems: models of input, output and cycling in whole systems models of stability and change in whole systems conclusions - a sense of the problem.
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Stephen Trudgill (1978) studied this question.
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