Dynamic bioproductivity of Scots pine stands within Northern Steppe of Ukraine conditions

Dynamic changes in forest ecosystems, which can be both short-term and long-term, are assessed on the scale of long-term biologically determined stages, through the determi-nation of age parameters. In this context, the results on the dynamic changes of the components of the aboveground phytomass of Scots pine in the northern steppe zone of Ukraine are presented. Based on the simulated growth tables of the studied modal artificial pine stands, standards for the dynamics of their bioproductivity have been developed for such components of aboveground phytomass as trunk in bark, branches in bark and needles. Modeling and statistical evaluation to determine the phytomass of the aboveground part of the pine stand: wood and bark of the trunk, branches and needles of the crown in a completely dry state. Tables of theoretical distribution of indicators of components of phytomass of pines for an age category from 10 to 80 years are con-structed. Regularities of phytomass changes of trunk components in bark and crown for stands of I–IV classes of quality were found. It is established that the dynamics of changes in the components of both the stem part and the components of the crown is characterized by a gradual increase in phytomass with age. The trend of dynamic changes is similar for all studied rating classes. It is ob-vious that stands of the first quality have the highest productivity of the studied classes. Decreased creditworthiness is accompanied by a gradual decline in productivity. It is investigated that the most significant differences in the phytomass parameters of different qualities are characteristic of older stands. It is calculated that the phytomass of the trunk in the bark varies from 5.4 t/ha (10 years) to 144 t/ha (80 years), and the nature of changes in the phytomass of the crown with age actually reflects the trend of phytomass dynamics of branches compared to pine. A comparative assessment of the dynamic changes of phytomass components of pine stands of the northern steppe part with the results of bioproductivity of pines of Ukrainian Polissya and Forest-Steppe, forest-steppe and northern-steppe regions of the European part, Kazakhstan and Siberia is given. On the basis of the received tables of dynamic changes of bioproductive processes in pines of the Northern Steppe the theoretical substantiation of practical use of normative-reference material for conditions of steppe part of Ukraine is made. The obtained results provide an opportunity to assess the current state of pine forests in the study region and predict the dynamics of their changes, which will allow the objective implementation of forestry measures, taking into account the regional peculiarities of pine formation.

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Hylobius species (Coleoptera: Curculionidae) from Siberia and the distribution patterns of adults feeding in Scots pine stands

Entomologica Fennica ◽

10.33338/ef.84045 ◽

2000 ◽

Vol 11 (1) ◽

pp. 57-66

Author(s):

Andrei Gourov

Keyword(s):

Scots Pine ◽

Distribution Patterns ◽

Steppe Zone ◽

Southern Taiga ◽

Forest Steppe ◽

Taiga Zone ◽

Mature Trees ◽

Additional Food ◽

Pine Stands ◽

Scots Pine Stands

Seven Hylobius species are known from Siberia, while the occurrence of three of them is doubtful. Information available about the supplementary feeding of adult weevils is reviewed. It is likely that H. abietis and H. albosparsus are the only species of economic significance in this territory. In the northern forest-steppe zone, adult weevils usually prefer to feed separately on isolated or border young trees under the canopy of light Scots pine stands, but avoid the undercanopy regeneration in the dense stands. In the southern taiga zone, adults are abundant on cutover areas where they feed in clumps of young regeneration. In fresh clearcuts, up to 100% of juvenile trees may be damaged by the feeding of weevils, whereas the damage intensity declines sharply with the distance to the clearcut. An edge effect in the distribution of adult weevils needs verification and, probably, is time-dependent. Inside the stands, the crowns of mature trees may constitute an additional food niche for adults if the usual sources and preferred environmental conditions are not available.

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Parameters of Pinus sylvestris health condition and Ips acuminatus population in pure and mixed stands of Sumy region

Наукові праці Лісівничої академії наук України ◽

10.15421/412012 ◽

2020 ◽

pp. 131-140

Author(s):

Valentyna Meshkova ◽

Ivan Bobrov

Keyword(s):

Scots Pine ◽

Bark Beetles ◽

Forest Health ◽

Health Condition ◽

State Enterprise ◽

Forest Steppe ◽

Population Parameters ◽

Mixed Stands ◽

Pine Stands ◽

Scots Pine Stands

Outbreaks of bark beetles have increased in recent years in various regions. Pine engraver beetle (Ips acuminatus (Gyllenhal, 1827); Coleoptera: Curculionidae: Scolytinae) is most common in the pine forests of many European countries. Research on its biology and spread carried out in different natural conditions, phases of pest outbreak and considered various parameters to characterize the population of the pest and forest health condition. The aim of the research was to compare the health condition of Scots pine stands and population parameters of I. acuminatus in its two generations in pure and mixed stands in Polissya and Forest-steppe parts of Sumy region. Research was carried out in 2017 in the pure Scots pine stands and mixed stands with Scots pine and other forest species in Polissya (State Enterprise "Seredyno-Budsky Agroforest Economy"; State Enterprise "Seredyno-Budsky Forest Economy") and Forest-steppe parts (State Enterprise "Velykopysarivske Agroforest Economy"; State Enterprise "Okhtyrske Forest Economy") of Sumy region at 26 sample plots. In sample plots, parameters of forest health condition and bark beetle population were assessed in June and in September, after completion of development of spring and summer generation of I. acuminatus. By most of the parameters assessed, significant differences between sample plots in Forest-Steppe and Polissya parts of Sumy region were not found. In pure Scots pine stands the mean area of bark beetles’ foci and bark beetles’ production were larger in Forest-steppe in June, and the density of Ips acuminatus nuptial chambers in June and September. In pure Scots pine stands the area of I. acuminatus focus, the number of colonized trees, the proportion of recently died trees, health condition indices, the density of egg galleries and nuptial chambers as well as young beetle’s production increased from June to September. In mixed stands the focus area, the number of colonized trees and health condition index increased insignificantly, and population parameters of I. acuminatus decreased from June to September. Pure Scots pine stands changed the health condition from "severely weakened" to "drying up" in three months, and mixed ones remained in the "weakened" category. In pure pine stands, the density of egg galleries and beetles of the young generation increased for three months from the lower limit of a moderate level to a high level, the density of nuptial chambers – from low to a high level. In mixed stands, all population parameters of I. acuminatus correspond to a low population level. The parameters characterizing the investigated foci of I. acuminatus in the Sumy region significantly correlated with the participation of pine in the stand composition, and in September the correlation is closer than in June. The data obtained indicate the feasibility of creating predominantly mixed pine stands.

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Long-term effect of wetland drainage on the productivity of Scots pine stands in Poland

Forest Ecology and Management ◽

10.1016/j.foreco.2012.02.032 ◽

2012 ◽

Vol 274 ◽

pp. 172-180 ◽

Cited By ~ 5

Author(s):

Jarosław Socha

Keyword(s):

Scots Pine ◽

Term Effect ◽

Wetland Drainage ◽

Long Term Effect ◽

Pine Stands ◽

Scots Pine Stands

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Analysis of oats varieties of selection of the Omsk Agrarian Scientific Center for the assembly of protein per unit area

Agrarian Bulletin of the ◽

10.32417/1997-4868-2020-197-6-38-48 ◽

2020 ◽

Vol 197 (6) ◽

pp. 38-48

Author(s):

O. Yusova ◽

P. Nikolaev ◽

Irina Safonova ◽

Nikolay Aniskov

Keyword(s):

Unit Area ◽

Steppe Zone ◽

Forest Steppe ◽

Stability Factor ◽

Integral Parameter ◽

Estimation Of Parameters ◽

Term Study ◽

Long Term Study ◽

Adaptability Parameters

Abstract. This article presents the results of a long-term study of a set of oat varieties in the southern forest-steppe zone of the Omsk region. The estimation of parameters of ecological adaptability for protein collection per unit area is given. Purpose. Long-term study of a set of oats varieties in the conditions of the southern forest-steppe zone of the Omsk region according to environmental adaptability parameters calculated on the basis of “protein collection per hectare”. Methods. The research was conducted from 2013 to 2017 in the conditions of the southern forest-steppe of Omsk. A detailed analysis of the adaptability parameters is provided: the indicator “protein collection per hectare” according to Zykin, ecological plasticity index according to Eberhart and Rassel, stability factor according to Lewis, homeostaticity and selection the value of varieties according to Khangildin, relative stability and stability criterion according to Sobolev, intensity according to the method of Udachin. The final adaptability of varieties is estimated by the sum of the ranks obtained by each variety for the studied parameters. Results. The results of the research have shown that they are most adaptive in the southern forest-steppe zone Omsk region filmy varieties Orion, Uranus and Sibirskiy Gerkules (total ranks 34–44) and Sibirskiy golozernyy (total ranks 61). Scientific novelty lies in the study of 13 varieties of membranous and hulless groups of oats, recommended for cultivation in the Omsk region. The collection of protein per hectare is an integral parameter that takes into account two indicators: the actual yield of the variety and the content of crude protein in the grain. Therefore, studies on this indicator are not popular. For the first time, thanks to the adaptive characteristics, varieties are divided according to this characteristic into intensive and extensive. The grouping of varieties depending on the cultivation areas is also given.

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Successions of microbiotic communities of sandy soils in pine stands of different ages in the forest-steppe zone

АгроЭкоИнфо ◽

10.51419/20216615 ◽

2021 ◽

Vol 6 (48) ◽

pp. 15-15

Author(s):

Nikolay Nevedrov ◽

Ekaterina Kuznetsova ◽

Elena Baidak ◽

Galina Popova

Keyword(s):

Scots Pine ◽

Sandy Soils ◽

Steppe Zone ◽

Forest Steppe ◽

Microbiological Activity ◽

Hydrothermal Conditions ◽

Innovative Methods ◽

Turf Soils ◽

Response Increase ◽

Transformation Processes

Peculiarities of transformation processes in soils should be taken into account when developing strategies for their rational use and optimization of their functions. The purpose of the work is to study the successions of soil microbiotic coenosis of azonal Al-Fe-humus sandy soils in pine forest stands of different age in the cities of the Kursk region. Traditional and innovative methods of studying the microbiological activity of soils are used in the work. Al-Fe-humus sandy soils of the forest-steppe covered with 100-year-old stands of Scots pine emit 2.1-2.3 times more CO2 than Al-Fe-humus sandy soils under 25 - and 70-year-old stands of pine and 1.5 times more than similar soils under herbaceous phytocenoses. It has been established that stands of Scots pine during 100 years of vegetation lead to significant changes in the basic properties of soils, changes in response, increase in podzolic process, changes in hydrothermal conditions, as well as increase in the biomass of the main groups of soil microorganisms (up to 38.1 times). Keywords: MICROMYCETES, ACTINOMYCETES, SANDY PODZOLS, GRAY HUMUS (TURF) SOILS, CO2 EMISSION, MICROBIOLOGICAL ACTIVITY OF SOILS

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The role of variety and forecrop in the population dynamics of Rhizoctonia solani in soil

Siberian Herald of Agricultural Science ◽

10.26898/0370-8799-2021-1-3 ◽

2021 ◽

Vol 51 (1) ◽

pp. 25-32

Author(s):

A. A. Malyuga ◽

N. S. Chulikova

Keyword(s):

Population Dynamics ◽

Rhizoctonia Solani ◽

Growing Season ◽

Steppe Zone ◽

Climatic Conditions ◽

Forest Steppe ◽

The Difference ◽

Two Peaks

Long-term studies (2014–2019) of the population dynamics of the fungus Rhizoctonia solani Küch. were carried out in the soil on the Purple Majesty, Vitelotte and Fioletovy potato varieties and preceding crops (potatoes, oats and tendergreen). The study was carried out in Novosibirsk region in the soil and climatic conditions typical of the forest-steppe zone of Western Siberia. To study the peculiarities of R. solani fungus population dynamics in potato plantations, soil samples were taken from under the plants during the entire growing season. The accumulation of rhizoctonia propagules in the soil was determined using the method of multiple soil pellets. The difference in the amount and rate of accumulation of the fungus R. solani on different varieties, as well as the influence of previous crops on this process, was established. Two peaks of the fungus accumulation were observed on the Purple Majesty variety: the first (48.7 propagules/100 g of soil) – during the full germination period, the second (57.2 propagules/100 g of soil) – at the end of the crop maturation phase. One peak was observed in the population dynamics of the fungus on Vitelotte and Fioletovy varieties, at the end of the ripening period (59.0 and 49.1 propagules/100 g soil, respectively). The smallest amount of R. solani fungus in the soil on average during the growing season was noted on the Fioletovy variety – 33.3 propagules/100 g of soil. In the Purple Majesty and Vitelotte varieties, this figure was 41.5 and 40.4 propagules/100 g of soil, respectively. When potato variety Agata was cultivated as monoculture, there was a rapid and significant accumulation of the fungus R. solani in the soil (from 34.6 to 126.8 propagules/100 g of soil). When this variety was cultivated following tendergreen or oats, the amount of the pathogen varied to a lesser extent (25.1–52.2 and 19.8–41.0 propagules/100 g of soil, respectively). No sharp increases in the number of propagative structures of the phytopathogen in the soil were noted.

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Short Communication: Proportion faunal assemblages of carnivorous mammals in geoecological districts of Mordovia, Russia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d221056 ◽

2021 ◽

Vol 22 (10) ◽

Author(s):

Alexey Andreychev

Keyword(s):

Short Communication ◽

Steppe Zone ◽

Forest Steppe ◽

Natural Areas ◽

Study Region ◽

Faunal Assemblages ◽

Number Of Species ◽

The Family ◽

Carnivorous Species ◽

A Priority

Abstract. Andreychev A. 2021. Short Communication: Proportion faunal assemblages of carnivorous mammals in geoecological districts of Mordovia, Russia. Biodiversitas 22: 4625-4632. In the forest-steppe area, carnivorous mammals are represented by species of different faunistic assemblages. This circumstance makes the study region a priority since the species of which faunistic assemblages prevail is of interest. Fifteen carnivorous species have been identified in the territory of Mordovia. Among them, the family Mustelidae predominates in terms of the number of species. The species are found in all geoecological districts, but their distribution is uneven. The most notable species in the region are located in coniferous and broad-leaved forests (40%) and species widely distributed in several natural areas (40%). 13% of the total number of noted species belong to the taiga fauna types. The steppe type of fauna is represented by only 7% of the total number of recorded species. For each geoecological region, the fauna features are given, and a list of rare and exciting species is given. The forest-steppe zone to which Mordovia belongs is compared by the fauna of carnivorous mammals with other regions from three typical faunal assemblages.

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Peculiarities of successional processes taking place in artificial phytocenoses on the Kuzbass coal mining dumps

BIO Web of Conferences ◽

10.1051/bioconf/20191600015 ◽

2019 ◽

Vol 16 ◽

pp. 00015

Author(s):

Tatiana Lamanova ◽

Natalia Sheremet ◽

Vladimir Doronkin

Keyword(s):

Coal Mining ◽

Trifolium Pratense ◽

Steppe Zone ◽

Botanical Garden ◽

Kuznetsk Basin ◽

Forest Steppe ◽

Initial Stage ◽

Arrhenatherum Elatius ◽

Zonal Soils

The article presents results of the long-term studies of the structure and production of agrophytocenoses, established on the coal mining dumps in the Kuznetsk basin forest steppe zone. Agrophytocenoses were established on the leveled dumps by seeding grasses and legumes. Another set of control agrophytocenoses was established by the same technic on zonal soil. Seeds were provided by the laboratories of the Central Siberian Botanical Garden SB RAS, Novosibirsk. After 30 yrs of observations it was found that agrophytocenoses on the coal mining dumps did not have initial stage, as well as stage of spontaneous species invasion. Elimination of Trifolium pratense and Arrhenatherum elatius from coal mining dumps phytocenoses took place 3-4 yrs later than from agrophytocenoses on zonal soils. Species did not eliminate totally, but remained in communities with increased or decreased relative abundances. Significant number of species displayed fluctuation, rather than succession in course of 30 yrs development on the coal mining dumps. These phytocenoses It was also found that agrophytocenoses on the coal mining dumps have high long-term production potential.

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