engleski

Correlation of Gley Soils Classified According to the Croatian Soil Classification With the WRB

In the past several years, additional soil research was conducted in Croatia with the aim of developing the correlation relationships between the Gleys soil class of Croatian Soil Classification (CSC) and the World Reference Base for Soil Resources (WRB) classification system. This paper presents the results of these studies and indicates the perceived problems and shortcomings, based on which the appropriate amendments to existing qualifiers in the WRB list are proposed. According to the CSC, the class of Gleys includes three types of soil: Eugley, Humogley and Pseudogley-gley. Most Eugleys and Humogleys may be correlated with the reference soil groups of Gleysols, and pseudogley-gleys with Stagnosols. However, based on the criteria used for separating Eugleys into subtypes, varieties and forms according to CSC, it is not possible to perform a complete correlation with the WRB, i.e. to determine all prefix and suffix qualifiers that can occur in each systematic unit. The reason is that the number of soil characteristics presented within the WRB qualifiers list for Gleysols or Stagnosols are not used as criteria for the separation of systematic soil units in CSC. It is therefore necessary to correlate each lower systematic unit of Eugleys with the WRB separately, taking into consideration all soil features. Considering the fact that gley soils in Croatia may be excessively moistened also by surface water, and not just groundwater, it is proposed to introduce the prefix qualifier Epistagnic into the WRB qualifiers list for Gleysols and to modify the Gleysols prerequisite of a layer 25 cm or more thick within 50 cm of the mineral soil surface, that has a gleyic pattern throughout the soil volume, so that a gleyic color pattern would be present in half or more of the soil volume, as was the case in the WRB (2006) Key to the reference soil groups, before its modification in 2007.

Croatian Soil Classification ; WRB ; Gleysols ; Stagnosols

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