Abstract
In Uzbekistan, more than half of population lives in rural area, their well-being depends on quality of land and water resources availability. Quality of land is determined by ameliorative indicators: ground water depth level, ground water salt amount and salinity of soil. These factors do not appear naturally but rather due to the human activity. Inefficient irrigation and excessive consumption of irrigation water on irrigated land in Boyavut District of Syrdarya region of Uzbekistan within several decades have led to a salinization of soil. The primary objective of this article is determination of the level of salinity of soil for modelling spatial distribution of soil salinity throughout an irrigated land by using GIS technology. This technology is focused on automation of development and creation of ameliorative maps, while totally eliminating manual operations. Nowadays, ameliorative expedition specialists still create cadastral map using tracing paper over the marginal areas within irrigated lands based on their ameliorative conditions and by selecting from the three thematic maps and then selecting the poorest conditions of ameliorative indicators. The suggested technology is designed for professionals of cadastral subdivisions of regional ameliorative expeditions, who use the GIS-based software, such as ArcView 3.2. or ArcGIS 10x; their duties include creating of thematic maps based on salinity levels of irrigated lands. Exact coordinates of collection sites of soils samples (collected in 2018-2019) were determined using GPS. The Inverse Distance Weighting (IDW) interpolation method was applied to use that data to create ameliorative maps categorized by the salinity levels (non-saline, slightly saline, saline area and highly saline areas). Those maps were then analysed to develop procedures on how to improve ameliorative conditions of irrigated areas.
Highlights
Uzbekistan is currently developing in all areas of rapid growth, which has not been neglected in the field of water reclamation
Prior to the introduction of Geographic information system (GIS) technologies in the field of reclamation, land reclamation map was a problem for staff, for example, one district needs [10−12] working days to produce a single soil salinity map, whereas there are more than 10 districts in the region
The Uzbekistan part of Golodnaya steppe is a part of the Syrdarya region and includes 8 administrative districts
Summary
Uzbekistan is currently developing in all areas of rapid growth, which has not been neglected in the field of water reclamation. Prior to the introduction of GIS technologies in the field of reclamation, land reclamation map was a problem for staff, for example, one district needs [10−12] working days to produce a single soil salinity map, whereas there are more than 10 districts in the region. This means that a lot of time and staff salaries required a substantial budget. We are currently on a high-performance, low-cost labor force using GIS technology, which is the application of GIS technology to analyze and evaluate soil salinity [Abdelfattah et al, 2009]. Maps and GIS in agriculture and land use Geographic information system (GIS) “Amelioration” of the region is based [Abdul-Qadir et al, 2010] on thematic ameliorative spatial data, which are used in the form of the distributed data bases at construction of true-to-life current ameliorative situation of irrigated lands in the region, and are used in cartographic materials and ameliorative cadastre
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