Catenary differentiation of the Nadym hills geosystems (Yamal-Nenets Autonomous District)
The change of landscape characteristics in space occurs in accordance with the successive change of the gradients of different factors. The redistribution of moisture, loose matter and chemical elements along the slope, i.e. on the catena is one of the drivers of intra-landscape changes. Catena surveys are extremely important for characteristic of zonal locations - flat interfluves. The catenary approach makes it possible to identify the main directions of transformation of the conditions of flat interfluves and to characterize the main factorial-dynamic series of geosystems. Flat interfluves are rare in the north of Western Siberia due to insignificant elevations and insufficient drainage. The catena was chosen within northern taiga subzone near Nadym hills. The main vegetation feature of the catena is an increase in plant species richness from top to bottom. The soils along the catena are characterized by an elongated profile, the absence of gleying, a low position of permafrost, a deep penetration of humus and a high content of organic carbon. In most locations, the summer soil temperature is above zero with the exception of saddles where stagnated moisture forms a powerful moss cushion. Acknowledgements: Theoretical provisions of the study were formulated within the framework of the Government Contract of the Institute for Water and Environmental Problems of the Siberian Branch of the Russian Academy of Sciences (No. FUFZ-2021-0007). Experimental work was supported by the government of the Yamal-Nenets Autonomous District within the framework of the project «Modern Climate Change and Its Impact on the Landscape Structure of the Yamal-Nenets Autonomous District».