The purpose of this paper is to present the results of sequence stratigraphic modeling of subcontinental reservoirs of the Tanopcha Formation upper part (Lower Cretaceous) of the Minkhov field, located in the northern part of the Messov oil and gas region of the Gydan oil and gas region. The study is vital due to the need for additional exploration and commissioning of hydrocarbon reserves in the lower part of the Pokur suprahorizon in the north of Western Siberia. The modeling is based on sedimentological columns for four wells, in which the object of study was characterized by a core with sufficient completeness. The structure of seven sequences has been studied. Sequences PK 2-2, 2-3, 2-4, 2-5, 2-6, and PK 3-1, in accordance with the classical concept, are divided into three systems tracts: lowstand (LST), transgressive (TST), highstand (HST). The boundaries of the sequences are outlined along the erosive surfaces in the bottom of the alluvial complexes. LST tops - on contacts of alluvial facies with tidal, marsh, lake sediments, indicating flooding of the coastal plain at the beginning of transgressions. TST tops - on contacts of facies of the tidal plain with alluvial deposits, indicating the beginning of normal regressions. The main reservoirs of the object are large belts and covers of alluvium of amalgamating channels as part of the LST. Additional reservoirs are thin bodies of tidal genesis in the composition of TST, and alluvial genesis in the composition of HST. The bottom of the PK 3-2 sequence was outlined on the contacts of coastal-marine TST sandstones with tidal and marsh facies, indicating the event transgression of the coastline. One of the main reservoirs of the field, the TP1 formation, is connected to the TST of the PK 3-2 sequence. The boundaries of the selected sequences can be traced on seismic sections of acoustic impedance. Depending on the temporary thickness in the impedance field, the sequences are displayed as two-, three- and four-layer sequences of layers, which opens up the possibility of their further study by the method of wave field inversion
O. V. PALAGUSHKINA1, E. N. UNKOVSKAYA2, L. B. NAZAROVA1 1Kazan Federal University, Kazan, Russia 2Volzhsko-Kama State Natural Biosphere Reserve, Sadovy, Russia
Keywords: biomass, climate change, monitoring, Raifskoe Lake, phytoplankton
Climate change, which causes significant structural transformations of ecosystems, is becoming one of the most acute environmental problems of our time. Monitoring observations in protected areas, where anthropogenic impacts are minimal, highlight the impact of climate on natural communities. We studied the changes in the structure of summer phytoplankton in Lake Raifskoe (Volga-Kama Reserve) and the relationships between these changes and environmental factors for more than twenty years. The study showed an increase in the proportion of dinophyte algae in the total biomass of summer phytoplankton in the studied lake situated in the forest zone. This structural change is more typical of the structure of lake communities in the forest-steppe zone. The climate, and particularly the air temperature of the warmest month (July), plays a leading role in the change in the structure of phytoplankton. The influence of climate humidity (precipitation) on the phytoplankton community was not revealed. Our data show that current climate changes lead to the rearrangement of phytoplankton communities, in which the structure of the biomass of the summer phytoplankton of the studied lake from the forest zone of the Middle Volga region can acquire features of the structure of lake communities from the forest-steppe zone.
Steppes and xeric meadows represent the most important element of zonal complexes in steppe and forest-steppe zones, as well as the corresponding altitudinal belts in mountains. These communities are floristically rich and extremely difficult to classify. The article revises the system of floristic classification of Siberian steppes and meadows representing the class Festuco-Brometea Br.-Bl. et R. Tx. in Br.-Bl. 1947. A formalized cluster analysis of 70 associations from Siberia, Kazakhstan, the Cis-Urals, the Urals and Trans-Urals was carried out (Fig. 1). OrderBrachypodietalia pinnati Korneck 1974 (Syntax. syn. Stipetalia sibiricae Korolyuk et Makunina 2001) in Siberia and the adjacent regions of Kazakhstan unites communities of xeric meadows and meadow steppes. It includes 4 alliances and 27 associations.
Alyona S. Tretyakova1, Alyona D. Vakhrusheva2, Nikolay Yu. Grudanov1, Elena V. Pismarkina1, Stepan A. Senator3, Dmitriy A. Philippov4 1Botanical Garden of the Ural Branch RAS, Yekaterinburg, Russia 2Ural Federal University, Yekaterinburg, Russia 3Tsitsin Main Botanical Garden of the RAS, Moscow, Russia 4Papanin Institute for Biology of Inland Waters RAS, Borok, Russia
Keywords: mires, flora of vascular plants, Red Data Book, specially protected natural areas, rare species, Sverdlovsk Region
The presented work contains the results of studying the floristic diversity of vascular plants in protected mires in the southern part of the Sverdlovsk Region (Russia). The studies were carried out on four peat lowland plain mires: Boloto u ozera Kukuyan, Belskoye, Savvateevskiy Ryam and Bakhmetskoe. The article provides a list of discovered species of vascular plants. In total, 135 species of vascular plants belonging to 88 genera, 46 families and 5 divisions were identified in the flora of the studied mires. The leading families in terms of the number of species are Cyperaceae, Rosaceae, Poaceae, Salicaceae, Asteraceae and Ericaceae, the leading genera are Carex and Salix. A relatively low level of species similarity between the mires floras under consideration was revealed - the average value of the Jaccard coefficient is 0.25. The highest values of similarity coefficients (0.37) were noted for the flora of geographically close bogs - Bakhmetsky and Belsky, located on the territory of the Pripyshminskiye Bory National Park. The flora is dominated by plurizonal and boreal species with a wide distribution (Holarctic, European-West Asian and Eurasian). Among the biomorphological groups, polycarpic herbs are of significant importance (83 species, 62 %) of which 37 % are rhizomatous plants. In the studied mires, cenopopulations of 2 rare species listed in the Red Data Book of the Sverdlovsk Region were recorded (Neottianthe cucullata, Platanthera bifolia). In addition to rare species, the studied peat bogs serve as a habitat for relict plants. For example, Calluna vulgaris grows in the Bakhmetskoe mire.
The article reports the results of the following studies: seasonal development, seed production and embryo conditions in the mature seeds of Delphinium grandiflorum L. The research was done over two years (2021-2022). The species successfully goes through all phenophases, one generative shoot forms 299-700 pcs. seeds. For the first time, significant differences were revealed in the number of flowers and fruits on the main axis of synflorescence and paracladia of various orders, as well as in the number of ovules in flowers and seeds in fruits located on different parts of synflorescence. The article presents the influence of vegetation period hydrothermal conditions on seed productivity and quality of seeds. The weather conditions of 2022 year were the most favorable for the growth and development of D. grandiflorum, which was expressed in the early beginnings of phenophases, high seed productivity, and the more developed embryos in mature seeds. This may be due to the fact that during the budding and flowering of D. grandiflorum there were absence of significant fluctuations in air temperature and humidity. D. grandiflorum plants are promising for cultivation in Western Siberia according to the following reproductive indicators: seasonal development, seed productivity and development of embryos in seeds.
Elena N. Podgaevskaya, Natalya V. Zolotareva
Institute of Plant and Animal Ecology, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
Keywords: rare plant species, monitoring, regional flora, Red Book of the Yamal-Nenets Autonomous Area, Western Siberia, Tyumen Region
The difficult natural conditions of the Purovsky District of the Yamal-Nenets Autonomous Area determine the insufficient floristic knowledge of this territory. The high degree of anthropogenic transformation of the vegetation of the area makes it necessary to identify habitats of rare plant species in order to preserve and restore their numbers. The expedition studies carried out by the authors in 2019 allowed us to obtain new information about the distribution of 6 rare plant species. Three species (Corallorhiza trifida Chatel., Botrychium multifidum (S.G. Gmelin) Rupr., Neottia cordata (L.) Rich.) have small locations within the Yamal-Nenets Autonomous Area and were first found in the Purovsky district. For three species (Goodyera repens (L.) R. Br., Dactylorhiza fuchsii (Druce) Soó, Lycopodiella inundata (L.) Holub), new locations have been identified that are significantly removed from previously known ones. Three species are included in the main list of the Red Book of the Yamal-Nenets Autonomous Area (Corallorhiza trifida, Dactylorhiza fuchsii, Lycopodiella inundata), two - in the Appendix to it (Botrychium multifidum, Goodyera repens). A rare species of the Orchidaceae family, Neottia cordata, was previously known from two localities in the mountainous part of the Yamal-Nenets Autonomous Area; two new localities were identified in the Purovsky district. In one of them, a large population of Neottia cordata was noted, which is of particular importance for the conservation of the species, because Currently, the number of localities in the Russian part of Neottia cordata is decreasing. The species needs protection and should be included in the Red Book of the region. The presented data complements information on the distribution of rare plant species and is necessary for further monitoring.
Based on studies of the biota of agaricoid basidiomycetes in Southern Siberia, information is provided on the morphology, distribution and ecological association of 3 new agaricomycete species for the mycobiota of Siberia: Hemimycena tortuosa (P.D. Orton) Redhead, Entoloma formosum (Fr.) Noordel., E. sublaevisporum Vila, Noordel. et O.V. Morozova, found in steppe and forest communities of Western and Eastern Siberia. The species Hemimycena tortuosa is also new to Russia.The specimens of this species are kept in the Herbarium of M.G. Popov of the Central Siberian Botanical Garden SB RAS (NSK).
Valentina Nesterovna Vasilyeva is one of the leading breeders and introducers of sunflower seeds in Siberia. All her scientific activities were connected with the Botanical garden in Novosibirsk. A number of varieties of apple, currant, gooseberry, in the breeding of which she took part, are zoned for Northern Kazakhstan, Western Siberia and other regions of Russia.
