Effects of land use changes on water and nitrogen flows at the scale of West African inland valleys: an explorative model.

摘要: Land use and cover, as influenced by agricultural practices, the changes in these with increasing pressure on land, are among factors determining water flows inland valleys. Changing affect nitrogen both at plot level levels higher than plots. We present a conceptual model to show potential influence of land flows. The first calculates three-dimensional redistribution valley using topographic characteristics input. For that purpose, is divided columns. Subsequently, annual one-dimensional balance computed for each column transfer functions. These functions soil input variables. Finally, calculated an equation which uses infiltration variable differentiates between uptake efficiency perennial vegetation. Both this were tested West Africa earlier study. model-runs simulating different land-use scenarios illustrate effects not additive, when spatial explicitly modelled. addition explicit time dimension will make more dynamic order analyse patterns throughout year can be used target further research processes underlying valleys: particular, scale dependency run-off relation practices merits attention field experiments.