scholarly journals SEASONAL DYNAMICS OF CARBON DIOXIDE, SENSIBLE AND LATENT HEAT FLUXES ON A CLEAR-CUT AREA IN THE SOUTHERN TAIGA ZONE OF EUROPEAN PART OF RUSSIA

2017 ◽  
Vol 28 (4) ◽  
pp. 5-23 ◽  
Author(s):  
A.V. Olchev ◽  
◽  
V.V. Mamkin ◽  
V.K. Avilov ◽  
A.C. Baybar ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Latent Heat ◽  
Seasonal Dynamics ◽  
Southern Taiga ◽  
European Part ◽  
Heat Fluxes ◽  
Taiga Zone ◽  
Clear Cut ◽  
European Part Of Russia ◽  
Southern Taiga Zone

scholarly journals Connection between the percentage of late wood and wood density in Scots pine from the southern taiga zone of the European part of Russia

10.12737/3340 ◽  
2014 ◽  
Vol 4 (1) ◽  
pp. 21-26
Author(s):  
Киселева ◽  
Aleksandra Kiseleva ◽  
Хван ◽  
Yuriy Khvan
Keyword(s):  
Environmental Factors ◽  
Scots Pine ◽  
Southern Taiga ◽  
European Part ◽  
Pine Forest ◽  
Taiga Zone ◽  
Late Wood ◽  
European Part Of Russia ◽  
Growing Conditions ◽  
Southern Taiga Zone

There is a relationship between the properties of wood. Percentage of late wood – wood macrostructure characterization is a definite relation to density. This relationship varies slightly depending on the species and environmental factors. Establishment of interrelation of these parameters for wood from different regions and growing conditions, will more accurately judge the quality indicators of wood in specific circumstances. The studies were conducted with a timber of Scots pine growing in the Vologda region. In Ustyuzhansky Forestry two sites differing in conditions of growth are selected - lichen pine forest and blueberry and cranberry pine forest.

scholarly journals IXODES TICK-BORNE BORRELIOSES: MODERN EPIDEMIOLOGICAL SITUATION IN THE CENTER OF THE EUROPEAN PART OF RUSSIA

2017 ◽  
Vol 25 (2) ◽  
pp. 202-208
Author(s):  
М. V. Polishchuk ◽  
T. D. Zdol'nik ◽  
V. N. Smetanin
Keyword(s):  
Lyme Disease ◽  
Distribution Patterns ◽  
Southern Taiga ◽  
European Part ◽  
Economic Damage ◽  
Forest Steppe ◽  
Taiga Zone ◽  
Zoonotic Infections ◽  
European Part Of Russia ◽  
Epidemiological Characteristics

Ixodes tick-borne borrelioses occupy one of the leading places in terms of morbidity and socio-economic damage among the natural foci of zoonotic infections in our country. Expansion of the range distribution of pathogens Lyme disease along with the widespread increase in the size of the main vectors of infection (ticks) determines the relevance of the study of the epidemiological characteristics of Lyme disease in areas that until recently were considered safe from the disease. This study was conducted to identify the level, dynamics and disease distribution patterns of Ixodes tick-born borreliosis in areas of Сentral European part of Russia, located in different climatic zones. Based on statistical data and reports from the Russian Federal Service for Oversight of Consumer Protection and Welfare- Rospotrebnadzor and Center of Hygiene and Epidemiology in Moscow, Ryazan and Tula regions for the 1992-2015 years, it has been shown that the incidence of Lyme disease increases moving from south to north as well as from the forest-steppe natural-climatic zone to the southern Taiga zone. The most epidemiologically disadvantaged region by Ixodes tick-born borreliosis amongst the studied regions was Moscow region, where the average annual incidence rate was 2,6 per 100 000 population. In all three areas, despite the differences in the species composition of mites and their degree of infection, there is an annual increase in morbidity due to Lyme borreliosis. The findings confirm the need for preventive measures against Ixodes tick-born borreliosis, the most significant being territorial coverage with acaricidal treatments.

scholarly journals Low-level jets and above-canopy drainage as causes of turbulent exchange in the nocturnal boundary layer

2014 ◽  
Vol 11 (16) ◽  
pp. 4507-4519 ◽  
Author(s):  
T. S. El-Madany ◽  
H. F. Duarte ◽  
D. J. Durden ◽  
B. Paas ◽  
M. J. Deventer ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Wind Speed ◽  
Eddy Covariance ◽  
Latent Heat ◽  
Heat Fluxes ◽  
Vertical Wind ◽  
Sensible Heat ◽  
Intermittent Turbulence ◽  
Low Level Jets ◽  
Vertical Wind Velocity

Abstract. Sodar (SOund Detection And Ranging), eddy-covariance, and tower profile measurements of wind speed and carbon dioxide were performed during 17 consecutive nights in complex terrain in northern Taiwan. The scope of the study was to identify the causes for intermittent turbulence events and to analyze their importance in nocturnal atmosphere–biosphere exchange as quantified with eddy-covariance measurements. If intermittency occurs frequently at a measurement site, then this process needs to be quantified in order to achieve reliable values for ecosystem characteristics such as net ecosystem exchange or net primary production. Fourteen events of intermittent turbulence were identified and classified into above-canopy drainage flows (ACDFs) and low-level jets (LLJs) according to the height of the wind speed maximum. Intermittent turbulence periods lasted between 30 and 110 min. Towards the end of LLJ or ACDF events, positive vertical wind velocities and, in some cases, upslope flows occurred, counteracting the general flow regime at nighttime. The observations suggest that the LLJs and ACDFs penetrate deep into the cold air pool in the valley, where they experience strong buoyancy due to density differences, resulting in either upslope flows or upward vertical winds. Turbulence was found to be stronger and better developed during LLJs and ACDFs, with eddy-covariance data presenting higher quality. This was particularly indicated by spectral analysis of the vertical wind velocity and the steady-state test for the time series of the vertical wind velocity in combination with the horizontal wind component, the temperature, and carbon dioxide. Significantly higher fluxes of sensible heat, latent heat, and shear stress occurred during these periods. During LLJs and ACDFs, fluxes of sensible heat, latent heat, and CO2 were mostly one-directional. For example, exclusively negative sensible heat fluxes occurred while intermittent turbulence was present. Latent heat fluxes were mostly positive during LLJs and ACDFs, with a median value of 34 W m−2, while outside these periods the median was 2 W m−2. In conclusion, intermittent turbulence periods exhibit a strong impact on nocturnal energy and mass fluxes.

Natural reforestation effect on soil organic carbon and СО2 flux dynamics in southern taiga ecosystems with Albeluvisols

2020 ◽  
Author(s):  
Ivan Vasenev ◽  
Tatyana Komarova ◽  
Solomon Melese
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Air Temperature ◽  
Natural Regeneration ◽  
Land Use Changes ◽  
Southern Taiga ◽  
Maximum Intensity ◽  
Taiga Zone ◽  
Southern Taiga Zone

<p><strong>Introduction.</strong> Natural reforestation is the widespread trend in the modern land-use changes in the southern taiga zone at the European territory of Russia after 1990s. Its total area is more than 10 million ha. At the same time forest natural regeneration is mutual usual process in the long-term land-use changes in this part of Russia with complex history of its development during millennium. It plays crucial role in soil successions, their fertility and environmental function dynamics including bio productivity support and carbon sequestration, which is given special attention against the background of global climate change challenges in the twenty-first century. This paper presents the results of a round-the-year monitoring of soil CO<sub>2</sub> emission in comparable sites of the fallow lands chrono sequences in conditions of a representative area of the Central Forest Reserve with background wood-sorrel spruce forests which are typical for the southern taiga zone of Central Russia.</p><p><strong>Objects and methods. </strong>The dominant soil type is sandy-loam Albeluvisols (by WRB, or Orthopodzolic soil by Russia Taxonomy, or Alfisols by Soil Taxonomy, or Podzoluvisols by FAO). The studies have been done in the representative 5 sites at different age of natural reforestation: (1) Fallow meadow grassland – “0-moment”; (2) Forest-fallow birch domination stage of 10-15 year; (3) Birch domination stage of 20-30 year with young spruce participation; (4) Birch-forest stage of 50-60 year with spruce participation; (5) Spruce-forest after fallow stage of more than 100 year with birch participation. CO<sub>2</sub> fluxes seasonal and diurnal dynamics measuring were carried out in situ using a mobile gas analyzer Li-820 and soil exposure chambers with parallel measurements of air temperature, soil temperature and moisture. Also, biomass, soil organic carbon and bulk density were analyzed in their topsoil and subsoil horizons with C stock calculation.</p><p><strong>Results and discussion.</strong> Analysis of the successional dynamics of the topsoil organic carbon stock showed the maximum rate of their increasing in the first stages of natural reforestation by a thick undergrowth of birch (more than 30 g m<sup>-2</sup>∙year<sup>-1</sup>) that agrees well with the maximum intensity of the woody biomass growth in case of dominant birch forest up to 50-60 years (more than 100 g m<sup>-2</sup>∙year<sup>-1</sup>). Research revealed the maximum intensity of soil CO<sub>2</sub> emission (up to 11-12 g C-CO<sub>2</sub> m<sup>-2</sup>∙day<sup>-1</sup>) in the meadow fallow land and its gradual decreasing in process of reforestation down to values close to background ecosystems in 4-5 g C-CO<sub>2</sub> m<sup>-2</sup>∙day<sup>-1 </sup>in the last investigated succession study with wood-sorrel spruce older than 100 years, which is in good correlation with the gradual humus accumulation in topsoil due to reduced mineralization of organic compounds from dying vegetation. The seasonal and daily dynamics of soil CO<sub>2</sub> emissions are determined by soil temperature (K<sub>TS</sub> 0.77 - 0.99), air temperature (K<sub>TA</sub> 0.42 - 0.99), and soil moisture in spring and fall (K<sub>WS</sub> -0.55 - -0.98).</p><p><strong>Conclusions. </strong>Investigation of forest natural regeneration impacts on the level of soil organic carbon accumulation and CO<sub>2</sub> fluxes in the representative southern taiga ecosystems is important element of their soil environmental monitoring and management.</p>

Changes in soil respiration in the course of the postagrogenic succession on sandy soils in the southern taiga zone

2013 ◽  
Vol 46 (9) ◽  
pp. 935-947 ◽  
Author(s):  
D. I. Lyuri ◽  
D. V. Karelin ◽  
A. V. Kudikov ◽  
S. V. Goryachkin
Keyword(s):  
Soil Respiration ◽  
Sandy Soils ◽  
Southern Taiga ◽  
Taiga Zone ◽  
Southern Taiga Zone
Sign in / Sign up

Export Citation Format

Share Document