Sustainability and long-term dynamics of soil organic matter and nutrients under alternative management strategies

摘要: Sustainable agricultural production systems should meet the requirements of farm household in terms food, income and leisure, without endangering productive capacity natural resource base. Land use are characterized by crops grown their order, techniques applied soil crop management. To judge degree sustainability, processes determining characteristics interactions, as influenced environmental conditions management practices be understood quantitatively. An experimental approach to this problem is problematic: it requires long-term experimentation, which laborious time-consuming takes too long yield relevant results within timeframe current priorities. Moreover, erratic unpredictable nature makes difficult time- location-specific information for extrapolation prediction. A modelling exploration dynamics sustainability indicators seems promising formulating criteria different strategies. In paper a model presented that harnasses existing knowledge into quantitative, descriptive relations. example given calibration on basis agronomic experiment. The performance organic matter appears ‘reasonable’, reproduces effects recognizable form. apparent discrepancy between nitrogen carbon behaviour must analysed more detail, establish its possible causes. It may well contrary predictions, additional losses through volatilization, denitrification or leaching have taken place. Further testing necessary, before confidence can placed predictive capacity.