scholarly journals Climatic Factors Of The Formation Of The Ravine-Beam System Of The Lower Volga Region

2021 ◽  
Vol 901 (1) ◽  
pp. 012062
Author(s):  
L L Sviridova

Abstract The Lower Volga regional natural complex has a heterogeneity of the relief, which, combined with the climate feature, leads to the degradation of soil covers. Disturbed soil cover with loose rocks is a fast mechanism for the formation of a gully-beam system. Natural natural conditions combined with human activity have led to catastrophic consequences of the withdrawal of land from land use. To prevent the development of these forms, it is necessary to conduct a study of each formation with tracking in a time period.

2018 ◽  
Vol 8 (4) ◽  
pp. 514-520
Author(s):  
Pablo Forlan Vargas ◽  
Amanda Chiarion Zecchini ◽  
Renato Silva Soares ◽  
Leonardo Dos Santos Duarte ◽  
Edgard Henrique Costa Silva

The lettuce cropping is an important segment of the national agriculture, with strong economic expression. However, climatic factors such as high temperature and humidity can affect this vegetable cultivation. These environmental conditions are common in various Brazilian regions, so the growers should adopt crop management systems, as soil covers, to minimize the environmental effect and obtain higher returns. Thus, the aim of this study was to evaluate the influence of different soil covers on the agronomic performance of crispy lettuce cultivars. The study was conducted at UNESP, Registro Campus, Brazil, from August to October, 2013. The experiment was carried out in a randomized blocks design, arranged in a 4x4 factorial, with three repetitions. The treatments consisted of the factors soil covers (black mulching, silver mulching, white mulching and control) and cultivars (Inaiá, Milena, Vanda and Vera). The experimental unit consisted of fifteen plants, with the useful area composed of nine central plants. At harvest, the following characteristics were evaluated: plant height, head diameter, fresh mass, number of leaves, leaf width, leaf height, stem diameter, heart diameter, heart height, dry mass, yield and nitrate content. Among the studied covers, white mulching showed the best results for the main productive characteristics and can be used as soil cover in the cultivation of Vera, Vanda and Inaiá culivars.


2019 ◽  
pp. 46-55
Author(s):  
С.Е. ЛАЗАРЕВ ◽  
А.В. СЕМЕНЮТИНА

Родовой комплекс Robinia L. представляет большой интерес для мобилизации генетических ресурсов в лесозащитные и озеленительные насаждения аридного региона. В настоящее время широкое распространение в озеленении и лесомелиорации на юге страны получил только один вид робинии Robinia pseudoacacia L. ( Р. лжеакация, или белая акация). Объектами исследований стали виды и формы рода Robinia: R. viscosa Vent. R. luxurians (Dieck) S.K. Schneid. R. pseudoacacia L. R. pseudoacacia f. pyramidalis (Pepin) Rehd. R. pseudoacacia f. unifoliola (Talou) Rehd. R. pseudoacacia f. umbraculifera (DC) Rehd., интродуцированные в дендрологических коллекциях Волгоградской области: ФНЦ агроэкологии РАН, кадастр 34:34:000000:122, 34:34:060061:10 и Нижневолжской станции по селекции древесных пород, 34:36:0000:14:0178. Цель работы изучить особенности роста и развития видов и форм рода Robinia в условиях интродукции и определить отношение к лимитирующим экологическим факторам сухостепной зоны Нижнего Поволжья. В результате проведенных исследований были установлены особенности роста и развития видов и форм рода Robinia в условиях интродукции, выявлены экологические закономерности формирования плодов и семян, определены пороговые значения климатических факторов по отношению к процессам жизнедеятельности, установлены особенности ростовых процессов в засушливых условиях. Выявлено, что основными факторами, лимитирующими процессы адаптации видов и форм рода Robinia в сухостепных условиях Нижнего Поволжья, является засуха и экстремально высокие и низкие температуры воздуха (40, 43). Толерантность растений к данным климатическим факторам является важным показателем успешности их интродукции. Исследования показывают, что существовавшие ранее различия в степени морозостойкости и засухоустойчивости между видами в процессе постепенной адаптации значительно сократились. Данный факт объясняется высокими темпами адаптации Robinia pseudoacacia к лимитирующим факторам окружающей среды. Еще недавно критической для этого вида считалась температура воздуха 25С. Как показали наши исследования, этот порог в процессе акклиматизации значительно снизился и составляет 37С. Все изучаемые виды робинии имеют относительно высокую степень зимостойкости в условиях сухостепной зоны Нижнего Поволжья. Менее зимостойкими оказались только декоративные формы Robinia pseudoacacia f. pyramidalis (Pepin) Rehd. и Robinia pseudoacacia f. umbraculifera (DC) Rehd., размножаемые в культуре преимущественно вегетативным способом. Определено, что робиния может успешно выращиваться в разных почвенногеографических районах сухостепной зоны Нижнего Поволжья. Максимальных размеров и долговечности насаждения из робинии достигают на черноземных почвах. Высота насаждений в 20летнем возрасте составляет 912 м. Посадки на темнокаштановых почвах к 20летнему возрасту достигают 810 метровой высоты, а на светлокаштановых 56 метров. The generic complex Robinia L. is great interest for the mobilization of genetic resources in forest protection and landscaping of the arid region. Currently wide spread in planting and forest reclamation in the South received only one kind of locust Robinia pseudoacacia L. ( R. leachate, or black locust). The objects of research were species and forms of the genus Robinia: R. viscosa Vent. R. luxurians (Dieck) S. K. Schneider. R. pseudoacacia L. R. pseudoacacia f. pyramidalis (Pepin) Rehd. R. pseudoacacia f. unifoliola (Talou) Rehd. R. pseudoacacia f. umbraculifera (DC) Rehd., introduced in the dendrological collections of the Volgograd region: FSC Agroecology RAS, cadastral number 34:34:000000:122, 34:34:060061:10 and the lower Volga station for selection of wood species, 34:36:0000:14:0178. The aim of the work is to study the features of growth and development of species and forms of the genus Robinia in terms of introduction and to determine the attitude to the limiting environmental factors of the dry steppe zone of the Lower Volga Region. As a result of the research, the features of the growth and development of species and forms of the genus Robinia in terms of introduction were established, the ecological regularities of the formation of fruits and seeds were revealed, the threshold values of climatic factors in relation to the processes of life were determined, the features of growth processes in arid conditions were established. It was found that the main factors limiting the adaptation of species and forms of the genus Robinia in the dry steppe conditions of the Lower Volga region is drought and extremely high and low air temperatures (40, 43). Tolerance of plants to these climatic factors is an important indicator of the success of their introduction. Studies show that preexisting differences in frost and drought resistance between species have been significantly reduced through gradual adaptation. This fact is explained by the high rate of adaptation of Robinia pseudoacacia to the limiting factors of the environment. Until recently, the air temperature of 25C was considered critical for this species. As our studies have shown, this threshold in the process of acclimatization has significantly decreased and is 37C. All studied species of Robinia have a high degree of winter hardiness in the dry steppe zone of the Lower Volga region. Less hardy turned out to be only ornamental forms of Robinia pseudoacacia f. pyramidalis (Pepin) Rehd. and Robinia pseudoacacia f. umbraculifera (DC) Rehd., propagated in culture mainly vegetative way. It is determined that Robinia can be successfully grown in different soilgeographical areas of the dry steppe zone of the Lower Volga region. Maximum size and longevity of the plantings of locust reach on Chernozem soils. The height of the plantings in the 20yearold whoplant is 912 m. Planting on dark chestnut soils to 20yearold reach 810 meter height, and on light chestnut56 meters.


2020 ◽  
Vol 10 ◽  
pp. 97-100
Author(s):  
V. V. Zadera ◽  

The cultural space of the polyethnic region of the Kamyshinsky district of the Saratov province from the 18th to the present is an integral systemic phenomenon. On the territory of the Lower Volga region, over the course of several centuries, a special cultural space was formed, the specificity of which was determined by economic and natural conditions, historically formed social, ethnocultural, and, of course, religious characteristics. A scientific analysis of the cultural space of the Kamyshinsky district, as a polyethnic region, allows us to be convinced of the processes of transferring values not only of national, but also of all-Russian culture, which have become the property of not just one taken country, but of the entire world society.


Author(s):  
E. A. Vertikova ◽  

In a competitive variety trial, promising selection lines of sugar sorghum were studied in the Lower Volga region. Based on a set of signs, the best lines were identified, which are recommended for transfer to the State Variety Testing. Breeding lines, which are distinguished by high values of commercially valuable traits, can be used in planned crosses to create highly productive varieties and hybrids of sugar sorghum.


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