The aim of the work is to determine the spatial characteristics of the distribution of the burnt areas of natural zonal landscapes of the Volgograd region with different duration of pyro-factor successions, taking into account the frequency of fires. Based on the previously developed thematic geo-information layers of the steppe fires in the region using overlay operations, the duration of post-pyrogenic periods in the municipal districts of the region was determined, taking into account the total number of fires from 1998–2018. The largest areas covered by fire have a succession duration of 2–3 years and 12–14 years at the beginning of 2019, which corresponds to the fires of 2016–2017 and 2005–2007, respectively. Large areas after the fires of 2001–2002 are located in Ilovlinsky, Kletsky, Pallasovsky and Surovikinsky districts. The largest area of land covered by fire in 2004–2006 is located in the Danilovsky, Ilovlinsky, Olkhovsky and Pallas districts. In our opinion, landscapes affected by fire no more than 5–7 years ago are suitable for the analysis of pyrogenic shifts. These territories are located in Frolovsky, Chernyshkovsky, Kotovsky, Ilovlinsky, Pallasovsky, Leninsky, Kamyshinsky, Staropoltavsky districts. The results will serve as the basis for field studies and the analysis of the spectral characteristics of overgrowing burns from remote sensing materials.
This article presents the results of the analysis of the spatial spread of desertification processes dynamics in four eastern municipalities of the Stavropol region – Levokumsky, Stepnovsky, Kursky districts, Neftekumsky city district. The increase in the rate of growth of desolate areas in the eastern part of the Stavropol region, bordering the Republic of Dagestan, requires careful study and forecasting due to the increasing intensity of these processes. Visual interpretation of high-resolution remote sensing materials for the territory of the eastern municipal districts of the Stavropol region was carried out. Sentinel satellite raster data with a resolution of 10 m and Landsat with a resolution of 30 m were used for decryption. The study period was 30 years (1990–2020) with decoding intervals of 10 years. The data obtained were analyzed to receive quantitative data on desertification processes in the east of the Stavropol region. Statistical data, including the calculation of the dynamics of desertification processes, calculated using vector decryption materials and geoinformation systems, are presented. No hotbeds of desertification have been identified in most of the study area. The main share of desertification hotbeds is concentrated in the south-eastern part of the research area. The decrease in the area of deserted areas was noted mainly in the Kursk and Stepnovsky districts. In the Levokumsky district in 2020, an explosive increase in the areas of desertification hotbeds and territories occupied by sand was revealed compared to 2010. Based on the results of decoding, schemes of the spatial location of desertification hotbeds and the dynamics of the spread of desertification processes were compiled. The data obtained will form the basis for further study of the dynamics of desertification processes and factors affecting it using remote and geoinformation methods.
The article is devoted to the analysis of fire regime of the Volgograd region's landscapes. The problem of wildfires became especially urgent at the beginning of the 21st century, when climate change and reduced agricultural load created conditions for landscape fires break-out and spread. Research material includes the archive of active fire foci (thermal spots) over the period of 2001-2018 years. Corpora of thermal spots in the context of seasonal, perennial, and landscape features of the region are formed on the basis of spatial analysis and attributive data samples. Landscape, seasonal and spatial regularities of the fire regime of the Volgograd region are revealed. The second decade of the 21st century was marked by a threefold decrease in the total number of active fire foci in the region mainly due to fires in typical steppe and dry-steppe landscapes. The research results provide an opportunity to analyze the implemented and planned fire prevention measures and to propose the ways of improving their efficiency.
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