A javasolt, diagnosztikus szemléletű talajosztályozási rendszer szerves szénre vonatkozó osztályozási egységei és definíciói | Proposed classifications and definitions for organic carbon for a diagnostic ground classification system

Organic carbon is a very important component of soils. It defines a number of physical, chemical, biological and moisture management features and multifaceted environmental functions of soils, including fertility, water filtration and service capabilities, buffer capacity, or biodiversity conservation. In modern classification systems, the appearance of organic carbon in quantity and depth is often the basis of diagnostic units and higher taxonomy units. When developing our diagnostic-based domestic soil classification system, we examined the organic matter criteria of the Hungarian genetic classification, analyzed in detail the data of the TIM database and took into account the international standards. We have tried to identify diagnostic units, subtypes, and variables that, in addition to the classification support, provide important information for different applications per se. According to our results, studying the TIM database, the authors' own soil description, and the need for organic carbon content justify further quantitative intervals at the lower (subtype and variation) level of classification. Another important result of our study is that it points out that the organic carbon content of the earthy part is not enough to diagnose the inventions. The rough part ratio, the saturation conditions, the color, the structure are further important criteria for defining the inventories and the surface diagnostic levels. At the same time, a uniform, type-independent definition of the quantity and depth of organic carbon provides important information on the soil in many respects. In our proposal, eight surface-level diagnostic soil levels, a ground-level diagnostic soil level, and a diagnostic soil were determined for organoleptic content. At lower levels of classification, we have proposed the introduction of 5 additional categories to provide a more detailed characterization of the organic carbon content in soils. In the proposed system, a total of 20 subtype and 2 variation properties will appear for organoleptic content or a requirement for diagnostic soil level, which includes the content of organic carbon too. The same interpretation of the individual elements allows the determination of spatial extent independent of the type.