scholarly journals Microbiological activity in the soils of pingos and thermokarst depressions in the south of the Vitim Plateau (Transbaikalia, Eastern Siberia)

2021 ◽  
Vol 908 (1) ◽  
pp. 012036
Author(s):  
E O Chimitdorzhieva ◽  
Ts D-Ts Korsunova ◽  
G D Chimitdorzhieva ◽  
Yu B Tsybenov ◽  
V P Garankina
Keyword(s):  
Microbial Biomass ◽  
Carbon Accumulation ◽  
Separate Group ◽  
Fungal Mycelium ◽  
Eastern Siberia ◽  
Microbiological Activity ◽  
The South ◽  
Microbiological Processes ◽  
Haplic Chernozems

Abstract The intensity of microbiological processes in soils of pingos and thermokarst depressions in the south of the Vitim Plateau was studied. The number of dominant groups of microorganisms (Fungi; Bacteria, and Actinomycetes as a separate group) in Haplic Chernozems (Stagnic, Turbic) and Calcaric Gleyic Phaeozems were identified. Carbon accumulation in microbial biomass in soils of pingos and thermokarst depressions varies considerably in comparison with background soils. Bacterial microflora has been proven to prevail in soils under the study. The maximum indicators of actinomycete and fungal mycelium were found in the soils of thermokarst depressions. Microbiological activity for all studied parameters is higher in Calcaric Gleyic Phaeozems.

scholarly journals Earth remote sensing for exploration and evaluation of geothermal resources in the south of Eastern Siberia (Russia)

Georesursy ◽  
2015 ◽  
Vol 63 (4) ◽  
pp. 62-69
Author(s):  
N.V. Vilor ◽  
◽  
M.Yu. Tolstoy ◽  
M.A. Vilor ◽  
◽  
...  
Keyword(s):  
Remote Sensing ◽  
Eastern Siberia ◽  
The South ◽  
Geothermal Resources ◽  
Earth Remote Sensing

Aboveground biomass and nitrogen nutrition in a chronosequence of pristine Dahurian Larix stands in eastern Siberia

1995 ◽  
Vol 25 (6) ◽  
pp. 943-960 ◽  
Author(s):  
E.-D. Schulze ◽  
W. Schulze ◽  
H. Koch ◽  
A. Arneth ◽  
G. Bauer ◽  
...  
Keyword(s):  
Aboveground Biomass ◽  
Forest Type ◽  
Nitrogen Nutrition ◽  
Carbon Accumulation ◽  
Eastern Siberia ◽  
Available N ◽  
N Nutrition ◽  
N Cycle ◽  
Fire Cycle ◽  
N Pool

Measurements of aboveground biomass and nitrogen (N) nutrition were made during July 1993 in 50-, 130-, and 380-year-old stands of Larixgmelinii (Rupr.) Rupr. in eastern Siberia. Constituting six forest types based on understorey plants, the stands were representative of vegetation throughout the Yakutsk region. Average tree height, diameter, and density ranged from 2 m, 23 mm, and 50 800 stems/ha in the 50-year-old stand to 11 m, 160 mm, and 600 stems/ha in the oldest stand. Aboveground biomass in the 50-year-old stand was 4.4 kg•m−2, and the aboveground N pool was 1.1 mol•m−2. This was slightly higher than the N pool in a 125-year-old stand with a Ledum understorey (1.0 mol•m−2), despite its higher biomass (7.2 kg•m−2). The highest observed aboveground biomass in a 125-year-old stand (characterized by the N2-fixing understorey plant Alnasterfruticosa) reached 12.0 kg•m−2, but the corresponding N pool was only 1.6 mol•m−2. In the oldest stand, aboveground biomass was 8.9 kg•m−2 and the N pool was 1.1 mol•m−2. There was thus a relatively constant quantity of N in the aboveground biomass of stands differing in age by almost 400 years. We postulate that N sets a limit on carbon accumulation in this boreal forest type. Trees were extremely slow growing, and there was essentially no aboveground biomass accumulation between the ages of 130 and 380 years because of a lack of available N. This conclusion was supported by graphical analysis indicating that the self-thinning process in our stands was not governed by the availability of radiation according to allometric theory. Much of the available N was used in the production of tree stems where 86% of the aboveground N (and 96% of aboveground biomass) was immobilized in the oldest stand. N in wood of the old stand exceeded the N pool in the litter layer and was 20% of the N pool in the Ah horizon. The processes of carbon and N partitioning were further explored by the estimation of carbon and N fluxes during three periods of forest development. We calculated a loss of ecosystem N during the period of self-thinning, while in the mature stands the N cycle appeared to be very tight. The immobilized N is returned from the wood into a plant-available form only by a recurrent fire cycle, which regenerates the N cycle. Thus fire is an essential component for the persistence of the L. gmelinii forest.

scholarly journals THE INTERNET PRESENTATION OF DATABASES OF GLACIERS OF THE SOUTH OF EASTERN SIBERIA

2017 ◽  
Vol 2 (23) ◽  
pp. 228-242
Author(s):  
A. D. Kitov ◽  
V. M. Plyusnin ◽  
E. N. Ivanov ◽  
D. A. Batuev ◽  
S. N. Kovalenko
Keyword(s):  
The Internet ◽  
Eastern Siberia ◽  
The South

scholarly journals The taxonomic structure of the fauna of ground beetles (Coleoptera, Carabidae) in the south of Eastern Siberia and Northern Mongolia

2021 ◽  
Vol 908 (1) ◽  
pp. 012022
Author(s):  
L Ts Khobrakova
Keyword(s):  
Ground Beetles ◽  
Taxonomic Composition ◽  
Taxonomic Structure ◽  
Eastern Siberia ◽  
The South ◽  
Study Region ◽  
Worldwide Distribution ◽  
Northern Mongolia ◽  
The World ◽  
Total Fauna

Abstract The taxonomic composition of the fauna has 577 species (608 subspecies) from 76 genera, representing 1% of the total fauna of the world and 5% of the Palearctic fauna. Most genera of ground beetles in the region have a predominantly Holarctic distribution, less often – Palearctic, tropical, or worldwide distribution. The fauna of the ground beetles of the region is based on the genera Amara, Bembidion, Pterostichus, Harpalus, and Carabus. The following genera are important for the fauna of ground beetles in the study region: Dyschirius, Agonum, Nebria, Cymindis, Dicheirotrichus, Poecilus, Trechus, Notiophilus, Elaphrus, Cicindela, Cylindera, Pogonus, Chlaenius, Pseudotaphoxenus.

scholarly journals The Contribution of Microorganisms to Soil Organic Carbon Accumulation under Fertilization Varies among Aggregate Size Classes

Agronomy ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2126
Author(s):  
Jinjing Lu ◽  
Shengping Li ◽  
Guopeng Liang ◽  
Xueping Wu ◽  
Qiang Zhang ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Microbial Biomass ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Aggregate Size ◽  
Carbon Accumulation ◽  
Community Diversity ◽  
C Storage ◽  
Soil Aggregate Fractions

Long-term fertilization alters soil microbiological properties and then affects the soil organic carbon (SOC) pool. However, the interrelations of SOC with biological drivers and their relative importance are rarely analyzed quantitatively at aggregate scale. We investigated the contribution of soil microbial biomass, diversity, and enzyme activity to C pool in soil aggregate fractions (>5 mm, 2–5 mm, 1–2 mm, 0.25–1 mm, and <0.25 mm) at topsoil (0–15 cm) from a 27-year long-term fertilization regime. Compared to CK (no fertilization management), NP (inorganic fertilization alone) decreased all of the microbial groups’ biomass, while NPS and NPM (inorganic fertilization plus the incorporation of maize straw or composted cow manure) significantly reduced this negative effect of NP on microbial biomass and increased the microbial contribution to C pool. The results show that microbial variables were significantly correlated with SOC content in >0.25 mm aggregates rather than in <0.25 mm aggregates. Fungal variables (fungal, AM biomass, and F/B ratio) and enzyme activities (BXYL and LAP) in >0.25 mm aggregates explained 21% and 2% of C, respectively. Overall, organic matter addition could contribute to higher C storage by boosting fungal community and enzyme activity rather than by changing microbial community diversity in macro-aggregates.

scholarly journals Distribution and bacterial availability of dissolved neutral sugars in the South East Pacific

2008 ◽  
Vol 5 (1) ◽  
pp. 725-750 ◽  
Author(s):  
R. Sempéré ◽  
M. Tedetti ◽  
C. Panagiotopoulos ◽  
B. Charrière ◽  
F. Van Wambeke
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Carbon Accumulation ◽  
Detectable Effect ◽  
Neutral Sugar ◽  
The South ◽  
East Pacific ◽  
Significant Stimulation ◽  
Neutral Sugars ◽  
Productive Area

Abstract. The distribution and bacterial availability of dissolved neutral sugars were studied in the South East Pacific from October to December 2004 during the BIOSOPE cruise. Four contrasted sites were investigated: Marquesas Islands (MAR), the hyper-oligotrophic South Pacific Gyre (GYR), the eastern part of the Gyre (EGY), and the coastal waters associated to upwelling of Chile (UPW). Total (free and combined) dissolved neutral sugar (TDNS) concentrations were higher in UPW (149–329 nM) and MAR (111–540 nM), than in GYR (79–390 nM) and EGY (58–492 nM). Nevertheless, their contribution to dissolved organic carbon (TDNS-C/DOC%) was generally low for all sites varying from 0.5% to 4% indicating that our South East Pacific surface waters were relatively poor in neutral sugars. Free dissolved neutral sugar (FDNS; e.g. sugars analyzed without hydrolysis) concentrations were very low within the detection of our method (5–10 nM) accounting <5% of the TDNS. In general, the predominant sugars within the TDNS pool were glucose, xylose, arabinose, and galactose while in the FDNS pool only glucose was present. TDNS stock to bacterial production ratios (integrated values from the surface to the deep chlorophyll maximum) were relatively high in GYR with respect to the low primary production, whereas the opposite trend was observed in the highly productive area of UPW. Intermediate situations were observed for MAR and EGY. Bioavailability of dissolved organic matter (DOM) exposed to natural solar radiation was also experimentally studied and compared to dark treatments. Our results showed no or little detectable effect of sunlight on DOM bacterial assimilation in UPW and in GYR while a significant stimulation was found in MAR and EGY. The overall results clearly suggest the semi-labile character of DOM in GYR compared to the labile of UPW and are consistent with dissolved organic carbon accumulation and the elevated C/N ratios reported by Raimbault et al. (2007).

scholarly journals Transformation of land resources as a result of anthropogenic impact

2020 ◽  
Vol 175 ◽  
pp. 06002
Author(s):  
Elena Sivak ◽  
Svetlana Volkova
Keyword(s):  
Soil Formation ◽  
Human Growth ◽  
Soil Processes ◽  
Formation Processes ◽  
Organic Substances ◽  
Land Resources ◽  
Microbiological Activity ◽  
Microbiological Processes ◽  
Agricultural Use ◽  
One Year

The article examined temporary matrices of transformation of soil processes related to the activity of microorganisms and humus in comparison with maternal matrices depending on age characteristics of man. The resulting match in value and productivity, from one year to 15 years, from 15 years to 40 years, from 40 years to 65 years, led to the idea of comparing human growth with soil zonal; Weights with indicators of activity of microbiological soil processes; Intelligence with active humus; Age with dynamics of development of temporary matrices on humus and microbiological activity. The dynamics of transformation of organic substances of upper soil horizons under the influence of agricultural use according to the general humus, taking into account their genesis, covers the period from 15 to 46 years; And on microbiological processes from 3 to 66 years. The conclusion is that the identification of human development with the development of soil-formation processes depending on their genesis brings us closer to a true understanding of our appearance, as a species possessing the power that can change the surrounding world through the noosphere in accordance with certain standards of transmutation.

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