Soil water balance scenario studies using predicted soil hydraulic parameters

摘要

Pedotransfer functions (PTFs) have become a topic drawing increasing interest within the field of soil and environmental research because they can provide important soil physical data at relatively low cost. Few studies, however, explore which contributions PTFs can make to land-use planning, in terms of examining the expected outcome of certain changes in soil and water management practices. This paper describes three scenario studies that show some aspects of how PTFs may help improve decision making about land management practices. We use an exploratory research approach using simulation modelling to explore the potential effect of alternative solutions in land management. We: (ⅰ) evaluate benefits and risks when irrigating a field, and the impact of soil heterogeneity; (ⅱ) examine which changes can be expected (in terms of soil water balance and supply) if organic matter content is changed as a result of an alternative management system; (ⅲ) evaluate the risk of leaching to deeper horizons in some soils of Hungary. Using this research approach, quantitative answers are provided to 'what if?' type questions, allowing the distinction of trends and potential problems, which may contribute to the development of sustainable management systems.