Geoinformation analysis and assessment of the current state of irrigated land in the Sarpinskaya lowland territory

Introduction. The relevance of the research is due to the need to assess the current state of irrigated lands in order to identify the level of degradation processes in the agricultural landscapes of the Sarpinskaya Lowland.

An object. The object of research in the period 2015-2021. were test sites characterizing the main typological groups of landscapes (the “Perekrestnoe” test site on the territory of the Sostinsky landscape region, the “Nizovy” test site on the territory of the Priergeninsky landscape region, the “Oak Ravine” test site, located on the border of the Sarpinsky landscape region, the “Kuksun” test site on the territory of the Volgo -Sarpinsky landscape district; testing ground "Koryagin" on the territory of the Yuzhno-Sarpinsky landscape region; testing ground "Sarpa", located on the territory of the Sarpinsko-Davansky landscape region; testing ground "Volzhsky" on the territory of the Astrakhan landscape region, testing ground "Black Earth" on the territory of the Chernozemelsky landscape region district i).

Materials and methods. The condition of the land was assessed using spectral spatial images using geoinformation programs and image analysis tools. To determine the macrostructure of the plots, large-scale space maps were used based on high-resolution spatial images - from 0.4 to 1.0 m. The method of interpreting space images to analyze the spatial distribution of fields is based on visual and semi-automatic identification of field contours according to the characteristic features of agrocenosis processing, according to relatively homogeneous the color tone of crops and the presence of protective plantings and field roads [1].

Results and conclusions. Based on the data obtained and geoinformation analysis, the geostatistical characteristics of the identified 325 irrigation areas were calculated. It has been established that the areas of autonomous irrigation plots in the study area vary from 5.4 to 22108.0 hectares. The developed local GIS of irrigated lands in the Sarpinskaya Lowland makes it possible to conduct a detailed analysis of the structure and condition of fields, organize regular remote monitoring of soils, irrigation regimes, as well as identify the potential productivity and yield of cultivated crops.

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