Within the research project: "Rationalization of marginal soils utilization" a database on the distribution of marginal soils based on natural criteria and included in the spatial information system has been developed in IMUZ. The main aim of the study was to identify and inventory marginal croplands in the regional scale. Basing on elaborated definitions and criteria for distinguishing marginal soils and habitats, a possibility of their identification upon the available cartographic documentation was analyzed. The possibility to inventory four types of marginal soils (sandy, erosive, polluted and mountain) on arable lands and five types of marginal habitats (bog, protected, extremely wet, polluted and mountain) on grasslands was demonstrated. For enlisted types of marginal soils and habitats, identification models in tabular form were built, which, after transformation into algorithms, were introduced into processing module in the created spatial information system. Elaborated identification system was tested on four regions differing in agricultural and natural conditions. The inventory of potential marginal croplands in the regional scale was found to be possible using computer techniques and collecting data acquired from the existing thematic maps. Obtained results confirm regional specifics of surface structure and sets of typical marginal soils and habitats. One of the main objectives of the research project: "Rationalization of marginal soils utilization" was to solve the problem of their identification and inventory in the regional and country scale. This paper presents principles of identification of marginal croplands based on the existing thematic maps and using elaborated identification models to build transformation algorithms in the spatial information system. Additionally, results of the inventory of marginal agricultural lands in selected regions are presented.
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