Features of the Tom' river basin humidification and ecological spectrum of the flora (in relation to humidification regime)

The aim of this work was to assess the effect of humidification peculiarities on the Tom river basin ecological structure using a complex territorY humidification index, i.e. Ped's drought index. The Tom' river basin is situated in the depths of a huge part of the land, near the center of Eurasia, at the crossroads of Western and Eastern Siberia, and is considerabty distant from the seas and oceans, which determines the degree of continentality of its climate. Watershed area is 62 000 km; river source: location - the Kuznetsk Alatau, height 903 m; coordinates: 53°39'05''N; 89°45'50''E.; river mouth: Ob' river, height 68 m; coordinates: 56°50'00''N; 84°29'20''E). The area is a mixture of areas with lowland and mountainous terrain. A significant area is within the plains of the forest-steppe zone and occupies the South-Eastern part of the West Siberian plain and the Kuznetsk Basin. The diversity of geographic conditions, including climate, is a significant cause of a high contrast of humidification resources distribution. Under such circumstances, an important environmental problem is the identification of the ratio of ecological characteristics of flora and humidification, which largety determines the biodiversity of the region. Taking into account the uneven humidification, which determines the diversity of habitats in the Tom' watershed, we determined 22 model basins. For each basin we generated datasets of average monthty air temperatures and sums of atmospheric precipitations. We used these data quantities to calculate complex Ped's drought index (S). Using Ped's drought index, we identified centers of high ("wet") and low ("dry") humidification of the Tom' river basin. On the flat part, the "drv" center is within the Kuznetsk Basin, and in the mountains it is located in the Western part of the Mountain Shoriva and the southern part of the Kuznetsk Alatau. The "wet" center, on the plain, is within the Sokur upland and Pritomskv area, and in the mountains it is situated in the foothills of the Western part of the Mountain Shoriva and in the highest part of the Kuznetsk Alatau. The location of these centers is the same both in summer and winter. In winter, on the plain, as well as in summer, there are two centers of winter humidification: "drv" and "wet", and the winter location coincides with the summer one: "drv" is within hollow basins (Uskat, Aba, Chernovov Natyk, Bol'shava Promyshlennaya, Un'ga and Bungarap); "wet" is within the Sokur upland and Pritomskv area (Lebvazhtya, Strelina, Sosnovka, Tugovakovka, Basandavka). We revealed that atmospheric ariditv is significantlv important for mesophvtes and mesohvgrophvtes in mountain areas in winter, especiallv during the most severe cold period, while the established relation is high and valid at a significance level (p<0.05). The article contains 5 Tables, 25 References.

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