Dynamics of the Spatial Organization of Phytomass in a Reserved Steppe Landscape: Case Study of Burtynskaya Steppe, Orenburg ReserveстатьяИсследовательская статья
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Аннотация:“Hot spot analysis” was applied to materials from 51 Landsat satellite images using the example ofthe “Burtinskaya Steppe” area of the Orenburgskii Nature Reserve, to study the dynamics of areas of positive phytomass anomalies relative to a neighborhood with a radius of 300 m. The purpose of this study was to establish the dependence of the variability of areas of increased phytomass on the landscape structure and hydrothermal conditions. The switching of phytocenoses in transition zones from steppe to meadow type offunctioning is ensured by varying the ratio of xerophytes and mesophytes depending on f luctuations in the hydrothermal conditions. The frequency and area of positive phytomass anomalies in the bottoms of gullies correlates with their area on partially forested slopes, which indicates the positive role of forest vegetation inthe stabilization of moisture inf lux into the bottoms. In deforested catchment areas of the south-facing slopes, the area of positive phytomass anomalies is determined by the supply of snow moisture, and, in the catchment areas of north-facing slopes, by warm-period precipitation. The binding factors for the most stablepositive anomalies of phytomass are the moisture convergence and the landform concavity rather than the catchment area.