Перегляд за Автор "Butterbach-Bahl, K."

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  • Ескіз
    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 Зіновійович
    Determination of NOx level at surface atmosphere is timely and urgent task for agricultural regions worldwide and was our main target during this study.
  • Ескіз
    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 Владимирович
    Soils, 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.
  • Ескіз
    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 Владимирович
    The 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.
  • Ескіз
    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 Зіновійович
    Flux 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.
  • Ескіз
    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 Владимирович
    Revealing 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.
  • Ескіз
    Документ
    Seasonal dynamics and profiles of soil NO concentrations in a temperate forest
    (2019) Medinets, Sergiy V.; Gasche, R.; Kiese, R.; Rennenberg, H.; Butterbach-Bahl, K.; Медінець, Сергій Володимирович; Мединец, Сергей Владимирович
    Aims Soils are known to be significant sources of atmospheric nitric oxide (NO), a key compound in atmospheric chemistry. NO is a key regulating substance for inter- and intra-species signalling and competition and affects plant growth and soilmicrobialmetabolisms. However, little is known about NO concentration in soils and production of NO in the soil profile. Methods Here we report on soil NO concentrations down to 65 cm soil depth and soil surface flux measurements over a 15 months period in subdaily resolution. This is supplemented by information on aerobic and anaerobic NO production in various soil layers of a spruce stand in SW Germany. Results NO concentrations showed a clear seasonality with highest concentrations of up to 800 nmol mol−1 (or part per billion in volume mixing ratio; ppbv) at the interface between the organic Of-Oh sub-layers in the summer. NO concentrations in the mineral subsoil (−65 cm) were approx. One order of magnitude lower than in the organic layer. Dynamic changes of soil NO concentrations were closely correlated with soil surface NO fluxes. Differences in soil NO concentrations across the soil profile reflected differences in aerobic and anaerobic NO production potential. Conclusion The importance of such high NO concentrations for soil microbial and plant physiological processes remains unclear, but should be addressed in future research in order to improve our understanding of microbe-microbe and plant-microbe interactions.
  • Ескіз
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    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.
  • Ескіз
    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.
  • Ескіз
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    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 Іванович
    The 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.