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    Wyświetlanie 1-4 z 4
    Tytuł:
    Observed and modelled solar radiation components in sugarcane crop grown under tropical conditions
    Autorzy:
    A. dos Santos, Marcos
    L. de Souza, José
    B. Lyra, Gustavo
    Teodoro, Iêdo
    A. Ferreira Junior, Ricardo
    C. dos Santos Almeida, Alexsandro
    B. Lyra, Guilherme
    C. de Souza, Renan
    A. Maringolo Lemes, Marco
    Powiązania:
    https://bibliotekanauki.pl/articles/972744.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    sugarcane
    albedo
    net radiation
    Opis:
    The net radiation over vegetated surfaces is one of the major input variables in many models of soil evaporation, evapotranspiration as well as leaf wetness duration. In the literature there are relatively few studies on net radiation over sugarcane crop in tropical climates. The main objective of the present study was to assess the solar radiation components measured and modelled for two crop stages of a sugarcane crop in the region of Rio Largo, Alagoas, North-eastern Brazil. The measurements of the radiation components were made with a net radiometer during the dry and rainy seasons and two models were used to estimate net radiation: the Ortega-Farias model and the Monteith and Unsworth model. The highest values of net radiation were observed at the crop development stage, due mainly to the high indices of incoming solar radiation. The daily average albedos of sugarcane at the crop development and mid-season stages were 0.16 and 0.20, respectively. Both models showed a better fit for the crop development stage than for the mid-season stage. When they were inter-compared, Monteith and Unsworth model was more efficient than Ortega-Farias model, despite the dispersion of their simulated radiation components which was similar.
    Źródło:
    International Agrophysics; 2017, 31, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Net radiation of mountain cultivated Norway spruce [Picea abies (L.) Karst.] stand: evaluation of short- and long-wave radiation ratio
    Autorzy:
    Markova, I.
    Marek, M.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/38453.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    net radiation
    mountain
    cultivated plant
    tree
    Norway spruce
    Picea abies
    tree stand
    radiation dose
    Opis:
    The radiation exchange drives the plant ecosystems energy balance and provides the energy for photosynthesis, transpiration and plant growth. The investigation on net radiation and its component during vegetation season in relation to the clearness index and sun elevation in a cultivated 31-year-old mountain spruce [Picea abies (L.) Karst.] stand is presented. Downward short-wave radiation – Sd (incident on the spruce stand was the main part of the short-wave radiation balance during the whole growing season (April–October) 2008. The Sd a mount i s seasonally variable factor determined by the duration of solar shine and the atmosphere transmissivity. Obtained value of net radiation (Rn) and downward short-wave radiation (Sd) ratio amounts to 0.61 on average during the growing season 2008 documenting the importance of the downward short-wave radiation in the net radiation of investigated spruce stand.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2011, 53, 2
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of solar radiation on selected physiological processes of mosses in karst conditions of the spring niches of the Ojców National Park (Southern Poland)
    Wpływ promieniowania słonecznego na wybrane procesy fizjologiczne mchów w warunkach krasowych nisz źródliskowych Ojcowskiego Parku Narodowego (Południowa Polska)
    Autorzy:
    Sołtys-Lelek, Anna
    Caputa, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2173119.pdf
    Data publikacji:
    2021-11-20
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    albedo
    biomass
    Brachythecium rivulare Schimp.
    Cratoneuron filicinum (Hedw.)
    chlorophyll a fluorescence
    electrolyte leakage
    net all-wave radiation
    Opis:
    The availability of light is one of the most important environmental factors influencing the floristic diversity of spring niches, especially in the specific conditions of deep, karst valleys occurring in the Ojców National Park (southern Poland). The aim of this study was to investigate the influence of solar radiation reaching the karst spring niches, on selected physiological parameters of the spring mosses: Cratoneuron filicinum (Hedw.) Spruce (obligatory krenophyte) and Brachythecium rivulare Schimp. (facultative krenophyte). The five karst spring niches (4 in the Prądnik Valley, 1 in the Sąspowska Valley) were selected for the plant material collection, in which two of the moss species tested occurred simultaneously. On sunny days, measurements of total and reflected radiation as well as the radiation balance in the full spectrum range over the vegetation were made. The temperature was measured for air, water, and on the surface and inside the plants. The collected biological material was subjected to laboratory analysis. Fresh mass of moss gametophytes was significantly the highest from plants growing on stand 5 (intermediate values of light and temperature parameters), and the lowest from mosses on stands 1 and 2 (including lowest air temperatures). Dry mass varied depending on the species and stand. The percentage of water in B. rivulare was highest in plants from  stand 4 (highest air and water temperature), and in C. filicinum from stand 5. Significantly the lowest values of this parameter were found for plants growing in stand 2 (lowest temperature of water). The electrolytes leakage from moss cells was specific and depended on the species. The greatest destabilisation of cell membranes was demonstrated in plants harvested from stands 1 and 2, where it was the coldest. The fluorescence of chlorophyll a varied depending on the moss species and the habitat of spring niches. This paper, presenting of preliminary results, is a kind of introduction to wider research in this topic.
    Dostępność światła jest jednym z najważniejszych czynników środowiskowych wpływających na różnorodność florystyczną nisz źródliskowych, zwłaszcza w specyficznych warunkach głębokich, krasowych dolin, występujących w Ojcowskim Parku Narodowym (południowa Polska). Celem niniejszej pracy było zbadanie wpływu promieniowania słonecznego, docierającego do nisz źródliskowych, na wybrane parametry fizjologiczne mchów źródliskowych: Cratoneuron filicinum (Hedw.) Spruce (krenofit obligatoryjny) i Brachythecium rivulare Schimp. (krenofit fakultatywny). Do zbioru materiału roślinnego wytypowano 5 krasowych nisz źródliskowych (4 w dolinie Prądnika, 1 w dolinie Sąspowskiej), w których występowały jednocześnie obydwa gatunki mchów. W słoneczne dni dokonano pomiarów promieniowania całkowitego, odbitego oraz salda promieniowania w pełnym zakresie widma nad roślinnością. Temperaturę pomierzono dla powietrza, wody oraz na powierzchni i wewnątrz roślin. Zebrany materiał biologiczny poddano analizom laboratoryjnym. Świeża masa gametofitów była istotnie największa u roślin rosnących na stanowisku 5, a najmniejsza u mchów ze stanowisk 1, 2. Sucha masa zmieniała się w zależności od gatunku i siedliska. Procentowa zawartość wody u B. rivulare była największa dla okazów ze stanowiska 4, a u C. filicinum ze stanowiska 5. Istotnie najmniejsze wartości tego parametru stwierdzono dla roślin rosnących na stanowisku 2. Wypływ elektrolitów z komórek mchów był specyficzny i zależał od gatunku. Największą destabilizację błon komórkowych wykazano u roślin zebranych ze stanowisk 1 i 2. Fluorescencja chlorofilu a zmieniała się w zależności od gatunku mchu i źródliska. Niniejsza praca prezentująca pilotażowe wyniki, stanowi niejako wstęp do szerzej zakrojonych badań w tym zakresie.
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis Studia Naturae; 2021, 6; 127-145
    2543-8832
    2545-0999
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis Studia Naturae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the effect of insect net used in greenhouse on indoor conditions: pepper plant sample
    Autorzy:
    Ocak, Aytekin
    Atılgan, Atılgan
    Powiązania:
    https://bibliotekanauki.pl/articles/101436.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    insect net
    solar radiation
    temperature
    greenhouse
    Opis:
    The aim of this study is to determine the effects of insect net placed on ventilation openings in greenhouses on temperature, humidity and radiation energy from indoor conditions. In addition, the effects of insect net on the agents used in biological control have been tried to be determined. The study was carried out between November 2017 and May 2018 in Kumluca district of Antalya in 2 glass and 2 plastic greenhouses. Greenhouses; the glass greenhouse without insect net (GCG), the glass greenhouse with insect net (GNG), the plastic greenhouse without insect net (PCG), the plastic greenhouse with insect net (PNG) is named as. Temperature, humidity and solar radiation values were measured in greenhouses. According to the results of the research; It was determined that the recommended temperature values for pepper development are only suitable in January and well below the recommended values in February. In other production months, the average temperature values of with insect net greenhouses (PNG-GNG) used in ventilation openings were found to be higher than without insect net greenhouses (PCG-GCG). When the results of relative humidity values were examined, it was observed that the use of insect tulle in the greenhouses was lower than the control greenhouses. It was determined that the solar radiation values were lower than the control greenhouses (PCG-GCG) of the insect tulle greenhouses (PNGGNG) in other months except January and May. Therefore, we can say that the use of insect net reduces the amount of solar radiation. Accord ing to the results of temperature values; the growth of Orius Leavigatus and Amblyseius swirski, one of the biological agents and resistant to high temperatures, was observed to slow down in all other months except February. For Phytoseiulus persimilis (30°C and above), we can say that this is a suitable environment and that the eggs have emerged in a shorter time. The most suitable average temperature for the development of Aphidius colemani was reached only in January. In other months, the development of this agent slows down, parasitic insecticides can be said to decrease the rate of parasitoids. As a result; It was determined that the temperature values were higher in the greenhouses where insect net was used and the solar radiation values were lower than the control greenhouses. However, since the use of insect net causes the temperature in the greenhouse to increase, it may create a positive development for some bio agents. It is thought that producers using insect net should make production considering these negativities in temperature and solar radiation.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2019, III/1; 197-217
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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