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Data on distribution of 3 rare species which occur in sandy arrays of cross-border territories of Southern Siberia and Mongolia are provided: Iris psammocola, Iris loczyi (Iridaceae) and Vicia tsydenii (Fabaceae), a brief characteristic of their cenopopulation is given.The originality of the plant communities which occur in sandy arrays allows a number of authors to distinguish them as special florocenotype-psammophyton (Psammophyton) [1]. The structure of vegetative cover of sandy arrays considerably depends on the relief and degree of the substrate coherence [2]. In the south of the Tuva Republic in the reserved area "Ubsu-Nur Depression" the cluster of "Tsuger-Els" was investigated. It represents a sandy mane extended from the northwest to the southeast along the left riverbank of the Tes-Hem. To the northwest of mane there is big fresh lake Tore-Hol. Within the cluster a wavy undulating land prevails. The total area of Tsuger-Els sands covers about 60 km². Similar arrays proceed also in the territory of Mongolia -the Altan-Els sands entering the largest array Borig-Del. The cluster belongs to Ubsunursky plain desert-steppe province [3]. In 2005 in the territory of Tsuge-Els cluster a new species for the flora of Russia -Iris psammocola Y.T. Zhao was found [4]. The species has obconical rhizome, flowers on short peduncles which are inside the curtain is characteristic of this species, is on 2 pedicel lanceolate webbed spata are available for each flower, the perianth tube is thin funnelshaped, many times exceeds the ovary at length, the flowers are sulfur-yellow. In 2013 in the neighborhood of lake Tore-Hol we also found this species: "Republic of Tuva, Erzinsky district, lake Tore-Hol neighborhood, Tsuger-Els sands, N 50˚09.231 'E 95˚12.751', H=1200 m, 6.06.2013. The plants occur in different plant aggregations of small structure and the rarefied herbage, at the same time the projective covering makes about 20% in cenopopulation: Thymus mongolicus (Ronn.) Ronn. -sp., Carex sabulosa Turcz. ex Kunth -sol., Agropyron desertorum (Fisch. ex Link) Schult.sp., Thesium tuvense Krasnob. -sol., I. psammocola -sol.; in some about 30%: Alissum lenense Adams -sol., Th. mongolicus -sol., Artemisia sp. -sol., Oxytropis tragacanthoides * Corresponding author: norbo@ngs.ru

During the winter period from 2015 to 2019, in the third decade of February and the first decade of March, snow and ice samples were taken from the area of the Goloustnoye municipal settlements located on the west coast of Lake Baikal, as well as from the adjacent water area of the lake (at a distance not exceeding 1000 m from the coast) and the Goloustnaya River. The sampling was carried out to give a modern ecological assessment of the state of the considered natural components and determine the relationship between the presence of pollutants and the level of human impact. Based on the data obtained, we constructed a map of the distribution of suspended solids, sulfates and heavy metals, such as manganese, copper, zinc, and lead, in the study area. The highest content of pollutants was determined in the samples of snow taken near settlements: the village of Bolshoye Goloustnoye and the village of Maloye Goloustnoye. Additionally, increased concentrations of suspended solids, sulfates, nitrites, ammonium, and manganese were found in the coastal area of Lake Baikal. At the same sampling sites, the pH values of meltwater corresponded to alkaline waters, which indicates anthropogenic pollution.

Зимой-весной 2015-2017 гг. авторы провели отбор проб снега с целью идентификации источников загрязнения снежного покрова, который является индикатором атмосферного загрязнения над акваторией оз. Байкал. Отобрано более 300 проб снега на акватории оз. Байкал и прилегающей территории. Параллельно в зимне-весеннее, летнее и осеннее время были отобраны образцы проб воды оз. Байкал и рек, впадающих в него, а также почв побережья-в летний период (всего > 1000 проб). Результаты химического анализа снега показали аномальные концентрации следующих химических элементов и веществ: F, PO 4 , Cl, SO 4 , nO 3 , nO 2 , na, K, nH 4 ,