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Документ Ambiemt NOx concentration above bare soil in southern Ukraine.(2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Butterbach-Bahl, K.; Gashe, R.; Pitsyk, Vasyl Z.; Skiba, U. M.; Пицык, Василий Зиновьевич; Піцик, Василь ЗіновійовичDetermination of NOx level at surface atmosphere is timely and urgent task for agricultural regions worldwide and was our main target during this study.Документ Changes in soil carbon and nitrogen dynamics during a three year crop rotation on a chernozem soil in the Southern Ukraine(Одеський національний університет імені І. І. Мечникова, 2014) Medinets, Serhii V.; Skiba, U. M.; Medinets, Volodymyr I.; Bilanchyn, Yaroslav M.; Pitsyk, Vasyl Z.; Hoshurenko, L. M.; Kotogura, S. S.; Медінець, Сергій Володимирович; Скіба, У. М.; Медінець, Володимир Іванович; Біланчин, Ярослав Михайлович; Піцик, Василь Зіновійович; Гошуренко, Л. M.; Котогура, С. С.; Мединец, Сергей Владимирович; Скиба, У. М.; Мединец, Владимир Иванович; Биланчин, Ярослав Михайлович; Пицык, Василий ЗиновьевичSoils in the southern Ukraine have been reported to have lost 32% to 40%, or 51 to 71 t ha-1 of their original soil organic matter (SOM) pool between 1881-1981, mainly due to inappropriate soil management by collective farms during 1930-1981. In this period agricultural management was directed towards irresponsible expansion of arable fields and short-term yield increases. Modern, sustainable agricultural management is slowly being introduced. There is a need to assess to what extend such methods stabilize and build new SOM to support and increase fertility both in the short and long-term. This study investigates the influence of a modern crop rotation (onion-tomato-barley) on one field, which was tilled, fertilized, irrigated and harvested in response to the crops needs, on the dynamics of total organic carbon (TOC) and total nitrogen (TN) storage in the fertile topsoil of a Chernozem typical for southern Ukraine. Crop residue remained on the field. The results of three years (2007-2009) of quarterly monitoring of the key topsoil parameters TOC, TN, extractable mineral N (NH4+, NO3-, NO2-), pH, potential net N mineralisation (MIN) and nitrification (NITR) rates and physical characteristics (bulk density, soil texture) are discussed. Moderate (114 kg N ha-1 yr-1) and low (28 kg N ha-1 yr-1) N fertilizer applications together with adequate drip irrigation for onion and tomato and incorporation of plant residue did significantly change the C and N pools. Total organic carbon and TN contents of the topsoil horizon (0-74 cm) were found to increase by 20% (26.8 t C ha-1) and 38% (5.9 t N ha-1), respectively. Largest increases were measured in the surface layer (0-27 cm) with a 45% increase in TOC and a 36% increase in TN content. The largest average soil NH4 + content of the topsoil horizon (0- 74 cm) was observed in 2009 under barley (154.9±41.3 kg N ha-1) and the maximum average NO3 - content was 166.9±44.5 kg N ha-1 under tomato in 2008. Mineralisation and nitrification rates significantly varied between years and with season and were largest in the first year of the crop rotation (onion), 41.0±57.3 kg N ha-1 and 36.6±74.4 kg N ha-1 for MIN and NITR, respectively. The incorporation of plant residues and efficient N fertilizer applications within a crop rotation appeared to be effective in stabilizing the existing SOM and promoting SOM build-up.Документ Cold season soil NO fluxes from a temperate forest: drivers and contribution to annual budgets(2016) Medinets, Sergiy V.; Gasche, R.; Skiba, U. M.; Schindlbacher, A.; Kiese, R.; Butterbach-Bahl, K.; Медінець, Сергій Володимирович; Мединец, Сергей ВладимировичSoils, and here specifically acidic forest soils exposed to high rates of atmospheric nitrogen deposition, are a significant source for the secondary greenhouse gas nitric oxide (NO). However, as flux estimates are mainly based on measurements during the vegetation period, annualNOemissions budgets may hold uncertainty as cold season soilNOfluxes have rarely been quantified. Here we analyzed cold season soilNOfluxes and potential environmental drivers on the basis of the most extensive database on forest soilNOfluxes obtained at the Höglwald Forest, Germany, spanning the years 1994 to 2010. Onaverage, the cold season (daily average air temperature<3 °C) contributed to 22% of the annual soilNObudget, varying from 13% to 41% between individual cold seasons. Temperature was the main controlling factor of the cold seasonNOfluxes, whereas during freeze-thaw cycles soil moisture availability determinedNOemission rates. The importance of cold season soilNOfluxes for annual NOfluxes depended positively on the length of the cold season, but responded negatively to frost events. Snow cover did not significantly affect cold season soilNOfluxes. Cold seasonNOfluxes significantly correlated with cold season soil carbon dioxide (CO2) emissions. During freeze-thaw periods strong positive correlations betweenNOandN2Ofluxes were observed, though stimulation ofNOfluxes by freeze-thaw was by far less pronounced as compared toN2O. Except for freeze-thaw periodsNOfluxes significantly exceeded those forN2Oduring the cold season period.Weconclude that in temperate forest ecosystems cold seasonNOemissions can contribute substantially to the annualNObudget and this contribution is significantly higher in years with long lasting but mild (less frost events) cold seasons.Документ Flux measurements of NOx in arable soil under dripping fertilization condition(Budapest: Project ECLAIRE, 2014-10) Medinets, Sergiy V.; Gashe, R.; Skiba, U. M.; Butterbach-Bahl, K.; Medinets, Volodymyr I.; Медінець, Володимир Іванович; Мединец, Владимир Иванович; Медінець, Сергій Володимирович; Мединец, Сергей ВладимировичThe aim of this study is to discuss appropriate design of measurements, characterize magnitude of NOx exchange during the long-term measurements and identify the main controlling factors for agricultural land, located on southern chernozems (black soils) in the South of Ukraine.Документ NO/NO2 fluxes measurement experience in arable land in Dniester catchment.(2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Butterbach-Bahl, K.; Gashe, R.; Pitsyk, Vasyl Z.; Skiba, U. M.; Пицык, Василий Зиновьевич; Піцик, Василь ЗіновійовичFlux measurement time episode (19.09-05.10.2012) was presented in this study to demonstrate possibility of system, an importance and complexity of exchange evaluation of NOx fluxes. Measurement period on field site has started from rather high emission rate, following perturbation of surface top layer of soil, with gradual reduction of emission probably due to declining microbial activity.Документ Potential mechanisms of soil nitric oxide production.(2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Skiba, U. M.; Butterbach-Bahl, K.; Мединец, Владимир Иванович; Медінець, Володимир Іванович; Медінець, Сергій Володимирович; Мединец, Сергей ВладимировичRevealing and figuring out possible NO production mechanisms in soils to mitigate nitric oxide influence on ozone formation in sensitive areas was the main goal of our study. Google Scholar and Web of Knowledge interactive data bases were used for review investigation of recent studies.Документ Surface ozone concentration measurement episode above bare soil in the Southern Ukraine.(Odesa: Pechatniy dom, 2013, 2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Butterbach-Bahl, K.; Gashe, R.; Pitsyk, Vasyl Z.; Skiba, U. M.The main purpose of our investigation is to study ambient O3 concentration levels and determine diurnal and seasonal course in typical agricultural area in the southern Ukraine.Документ The impact of management and climate on soil nitric oxide fluxes from arable land in the Southern Ukraine.(Amsterdam, Netherlands: Elsevier, 2016) Medinets, Sergiy V.; Gashe, R.; Skiba, U. M.; Medinets, Volodymyr I.; Butterbach-Bahl, K.NO fluxes from soils are a significant source for tropospheric NOx, though global and regional estimates of the soil source strength are constrained by the paucity of measurements. In a continuous 18 month effort (2012e2014) soil NO fluxes from an intensively managed arable site in the black soil region of the Southern Ukraine (Odessa region) were measured using an automated dynamic chamber system. Measurements revealed three periods of peak NO emissions (fertigation, re-wetting of soils, and to a lower extend during winter), with a pulse emission peak during soil re-wetting in summer of 88.4 mg Nm_2 h_1. The mean annual NO flux was 5.1 ± 8.9 mg N m_2 h_1 and total annual NO emissions were 0.44 ± 0.78 kg N ha_1 yr_1. The fertilizer induced emission factor for NO was 0.63% under beetroot. The combined effect of soil temperature, soil moisture and soil DIN (NH4 and NO3) concentrations were identified as drivers of the temporal and spatial variability of soil NO fluxes. This work shows that longterm measurements are needed for estimating annual fluxes and the importance of soils as a source for tropospheric NOx as the contribution of different seasons and crop growing periods to the annual budget differed markedly.Документ The role of nitrification and denitrification in soil nitric oxide production.(2013-05) Medinets, Sergiy V.; Medinets, Volodymyr I.; Skiba, U. M.; Butterbach-Bahl, K.; Мединец, Сергей Владимирович; Медінець, Сергій Володимирович; Мединец, Владимир Иванович; Медінець, Володимир ІвановичThe main purpose of our survey study is an understanding of NO production/ emission mechanisms in soils allow to develop the mitigation strategy for its reduction, leading to O3 level declining. Published data were obtained using Web of Knowledge and Google Scholar research article data bases.Документ Глобальная проблема азота: причины, последствия, исследования на территории Украины(Одеса: ІНВАЦ, 2012) Мединец, Сергей Владимирович; Мединец, Владимир Иванович; Котогура, Светлана Станиславовна; Пицык, Василий Зиновьевич; Скиба, У. М.; Саттон, Марк А.; Medinets, Sergiy V.; Medinets, Volodymyr I.; Kotohura, Svitlana S.; Pitsyk, Vasyl Z.; Skiba, U. M.; Satton, Mark A.Атмосферно-химические исследования на станции мониторинга «Петродолинское» дали возможность впервые для Украины не только получить уникальные экспериментальные данные по азотным соединениям (бюджету, балансу, концентрациям), но и создать базу для дальнейших исследований в данном направлении и начать внедрение системы атмосферного мониторинга с использованием современных европейских методов и оборудования.