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    Wyświetlanie 1-2 z 2
    Tytuł:
    Próba oceny produktywności ekosystemu w warunkach polowych Wielkopolski
    An Attempt to Evaluate the Productivity of Ecosystems Under Field Conditions of Wielkopolska
    Autorzy:
    Kowalska, N.
    Chojnicki, B. H.
    Józefczyk, D.
    Urbaniak, M.
    Juszczak, R.
    Olejnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819124.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    produktywność ekosystemu
    warunki polowe
    qinghai-tibetan plateau
    carbon dioxide
    alpine meadow
    CO2 exchange
    environmental control
    water vapor
    temperature
    boreal
    fluxes
    forest
    Opis:
    The Eddy Covariance technique has been applied for corn field NEE estimation. The Smith, Michaelis-Menten and Misterlich formulas has been used for calculation of net ecosystem exchange (NEE) values between corn canopy and the atmosphere. These approaches have been applied for estimation of temeparture and radiation modification impact on the corn field productivity. The NEE has been evaluated in the first part of this paper and then the relation of NEE runs and elements that influence the NEE values has been summarized. In another part the analysis of NEE under thermal and radiative conditions has been presented. The Michaelis-Menten model has been found as the most distinct one for the measurements of the relationship. This model indicated that the highest NEE value (NEE = 10.0 µmol m-2 s-1) has been found under combination of the low radiation and high temperature conditions. The lowest value of NEE has been estimated under the highest PPFD and lowest Ta amount. The applied models have confirmed relationship between NEE, PPFD and Ta. All three models confirmed the fact that the lowest ecosystem productivity is found under high radiation input. The accumulated NEE values were compared with the real values according to the Smith, Michaelis-Menten and Misterlich equations. The results of the Michaelis-Menten equation and Misterlich were the most similar to the real cumulative NEE values. The theoretical change of thermal (0.5°C increase) and radiation (4% decrease) resulted in tested higher CO2 sequesteration from the atmosphere.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2481-2495
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sezonowy przebieg wskaźnika wykorzystania wody (WUE) w lesie sosnowym
    Seasonal Water Use Efficiency (WUE) Index Course in Pine Forest
    Autorzy:
    Ziemblińska, K.
    Urbaniak, M.
    Danielewska, A.
    Baran, M.
    Juszczak, R.
    Chojnicki, B. H.
    Olejnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819204.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    wykorzystanie wody
    lasy sosnowe
    flux measurements
    carbon
    exchange
    canopy
    heat
    Opis:
    Assessment of the ecosystem productivity in relation to the amount of water used for such kind of processes have already been investigated for the different ecosystem types by many researchers. Water Use Efficiency (WUE) parameter shows seasonal variation due to changing weather conditions, which determine processes of photosynthesis, respiration and evapotranspiration, and because of biological factors variability. The analysis of the WUE dynamics in the forest ecosystem in Tuczno research station over the hydrological year 2012 were presented in the paper. WUE was calculated based on the daily CO2 and H CO2 O fluxes measured by means of the eddy covariance system (EC) installed over the forest canopy. The fluxes were quality checked in relation to the wind direction, friction velocity values and stationary. The data series used in this investigation were not gap-filled. By using the net value of both fluxes, a good indicator which describe the behavior of the ecosystem as the whole, was obtained. Among a number of weather condition factors, that affect the value of the tested indicator (WUE), mainly photosynthetic photon flux density (PPFD) and the air temperature were evaluated. Separate analysis has been done for daily courses of both CO2 and H2 O fluxes, as well as for WUE for each month of the analyzed period. The highest values of H2 O fluxes (FH) were observed in May and June (0.25 and 0.3 kg m-2s-1) and the lowest in the period from September to December (0.02–0.05 kg m-2s-1). The daily courses of water vapor fluxes revealed dependence to the measured PPFD fluxes, which determines in turn the intensity of the evapotranspiration process. The time courses of the daily 30-min average carbon dioxide fluxes (FC) were also highly variable in each month, similarly to the variances of the FH fluxes. The lowest values of the net F COC were measured in the period from October to December (net CO2 fluxes did not exceed 0.55g m-2 s-1), while in the period from April to July the net ecosystem productivity was the biggest (1.5–2.0 m-2s-1),). WUE reached its minimum in May (7 g [CO2] kg-1), [H2O]), what indicates that the evapotranspiration of the ecosystem was the least effective from the point of view of COCOD absorption from the atmosphere (the ecosystem had a high productivity but it lost a great amount of water at the same time). In contrary, higher WUE values were observed in the colder period of the year, when the amount of available radiant energy was limited. WUE reached its peak in September (nearly 45 g of [CO2] kg-1), [H2O] ) which reveals, that in autumn the decline of evapotranspiration rates were higher than rates of the net CO2 exchange decrease. It also highlights the high adaptability of Scots pine (main species in studied forest ecosystem – 99%), to described conditions. The designated water use efficiency (WUE) parameter, may be used as a good indicator of the current condition of the ecosystem.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2780-2798
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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