Diagnostic Horizons in the Classification System of Russian Soils: Version 2021
| Autor: | M. I. Gerasimova, N. B. Khitrov |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Eurasian Soil Science. 54:1131-1140 |
| ISSN: | 1556-195X 1064-2293 |
| DOI: | 10.1134/s1064229321080093 |
| Popis: | Updating the classification system of Russian soils as a preliminary procedure to the development of its new version is provided by new data, extensive testing of the system in terrain conditions, online and offline discussions, validation in the course of cartographic works, and addressing to the international experience. The first step in updating—analysis of diagnostic horizons as basic elements of the system—comprised scrutinizing the array of horizons, checking their essence, and improving the scheme of their presentation in the system, which is believed to be more convenient and up-to-date. Eleven horizons were moved to a lower category of diagnostic properties. However, it was proposed to enlarge the set of human- modified horizons by introducing the technogenic horizons in addition to the agrogenic horizons, to add a special chernozemic horizon (like chernic horizon in the WRB), and to separate the mesotrophic peat horizon from eutrophic and oligotrophic peat horizons. In the definitions of diagnostic horizons, more strict and formal criteria were formulated along with descriptive characteristics of pedogenesis and the environment. Hence, the volume of definitions of diagnostic horizons increased by approximately three times on the average, while the definitions of diagnostic criteria were preserved intact. Names or symbols were modified for several horizons. As a result, the total number of diagnostic horizons decreased from 51 in the former version-2008 to 47 in the proposed updated version. This paper presents the updated list of horizons and three examples of their revised definitions in the expected updated version. The article provides a proposed general list of diagnostic horizons and 3 examples of new horizon descriptions. |
| Databáze: | OpenAIRE |
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