Long-term salinization dynamics in irrigated soils of the Golodnaya Steppe and methods of their assessment on the basis of remote sensing data |
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| Authors: | D I Rukhovich E I Pankova G I Chernousenko P V Koroleva |
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| Institution: | 1.Dokuchaev Soil Science Institute,Moscow,Russia |
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| Abstract: | A set of salinization maps (1983–2000) for the former Yusupov State Farm in the irrigated area of the Golodnaya Steppe (Uzbekistan)
were developed with the use of aerial and satellite images taken in the early autumn season. A unified approach based on the
analysis of the mottled patterns of the cotton fields was used. The soil cover of the farm consists of irrigated hydromorphic
moderately saline soils with the participation of nonsaline and strongly saline soils. The long-ter m dynamics of the soil
salinity were studied via superposing two or more maps for different years. It was shown that the long-term salinization dynamics
could not be determined on the basis of the comparison of only two maps for different years. Maps of the trends of the salinization
for the entire period of the observations, a map of the salinization dynamics showing the degree of changes in the soil salinity
for the particular areas, a map of the areas with stable salinization through the entire period, and some other maps were
developed. A considerable part of the investigated area was characterized by highly unstable soil salinity and active salinization-desalinization
processes. The degree of the soil salinity varied from slight to strong and vice versa. For the entire period, the soils were
mainly medium saline in the upper meter with a weakly expressed tendency for further salinization and a drop in the area of
nonsaline and slightly saline soils. |
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