Estimation of spatially distributed soil information: dealing with data shortages in the Western Bug Basin,Ukraine |
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| Authors: | Filipa Tavares Wahren Maria Tarasiuk Andriy Mykhnovych Myron Kit Karl-Heinz Feger Kai Schwärzel |
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| Institution: | 1.Institute of Soil Science and Site Ecology,Technische Universit?t Dresden,Tharandt,Germany;2.Department of Soil Science and Soil Geography,Lviv Ivan FrankoNational University,Lviv,Ukraine;3.Department of Applied Geography and Cartography,Lviv Ivan FrankoNational University,Lviv,Ukraine |
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| Abstract: | Integrated watershed models require spatially differentiated soil information. However, in many regions of the world the limited
availability of soil data hinders an appropriate simulation of hydro-ecological processes. Such circumstances lead to unsupported
statements, poor statistics, misrepresentations, and, ultimately, to bad resource management. The Western Bug catchment in
west Ukraine is an example of such a region. In the former Soviet Union, soil classification primarily focused on soils of
agricultural importance, whereas, forested, urban, industrial, and shallow soil territories were left underrepresented in
the classification and soil maps. Spatially differentiated soil texture data are required to predict soil hydraulic properties
using pedotransfer functions (PTFs), along with soil maps. Furthermore, the Ukrainian soil texture scheme does not match the
particle size classes commonly used with PTFs. To overcome these shortcomings, a fuzzy logic methodology was applied, based
on terrain and vegetation/land use analysis and soil sampling, to close the information gaps. For the application of PTFs,
a procedure was tested to estimate missing values of soil texture distribution. Applied methods were evaluated using recent
soil surveys, measured soil texture, and water retention properties, while having in consideration the limitations brought
by scarce soil data for integrated watershed modelling purposes. |
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