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Wyszukujesz frazę "forest humus" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Chemistry of raw humus vs. chemistry of atmospheric precipitation on the example of pine forests of the Pomeranian Lakeland
    Autorzy:
    Wicik, Bogumił
    Mikulska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2028863.pdf
    Data publikacji:
    2004-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    forest litter
    humus
    atmospheric precipitation
    Opis:
    This research, conducted for the purposes of the protection of the National Park Bory Tucholskie, contains the results of the investigation of the chemical composition of humus (forest litter) and of atmospheric precipitation. The gathered material allowed determining the fate (accumulation or removal) of chemical elements contained in the pine forest humus as well as to compare the abundance of nutrients in humus and in atmospheric precipitation.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2004, 11; 51-55
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energia powierzchniowa i wielkosci jej skladowych jako parametry okreslajace zwilzalnosc i stan agregacyjny wybranych mineralow ilastych i gleb
    Surface energy and its components as parameters determining wettability and aggregation state of selected clay minerals and soils.
    Autorzy:
    Hajnos, M
    Powiązania:
    https://bibliotekanauki.pl/articles/1630383.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    agrofizyka
    gleby
    gleby organiczne
    gleby mineralne
    mineraly ilaste
    prochnica
    prochnica lesna
    kwasy huminowe
    struktura gleb
    zwilzalnosc
    zwilzalnosc gleb
    powierzchnia gleb
    agregaty glebowe
    energia powierzchniowa
    soil
    organic soil
    mineral soil
    clay mineral
    humus
    forest humus
    humic acid
    soil structure
    wettability
    soil wettability
    soil surface
    soil aggregate
    surface free energy
    Opis:
    In the present work problems related to surface free energy of different agricultural materials such as clay minerals, mineral soils, organic soils and forest litter were considered. Methodical investigations of surface free energy determination as well as fundamental investigations connected with the influence of the surface cations and organic substance on the wettability, free energy and interaction forces between clay minerals and soil particles were undertaken. The interaction forces between clay minerals and soil particles perform a fundamental role in aggregation, flocculation and forming of solids structure. In case of solids the surface free energy can be determined indirectly for example from the measured contact angles or from the adsorption values (by determination of film pressure jt) with appropriate theoretical assumptions. Such methods were applied in this paper to determine surface free energy components for clay minerals and soils. Because of difficulties in contact angle measurements by sessile drop method (especially for organic soils and humus) thin layer wicking or thin column wicking technique were applied. The investigations of penetration rates of water and organic liquids carried out for clay minerals and their mono ionic forms showed the close dependence between the kind of mineral and surface cation. The linear dependence of penetration rates was obtained at the lowest penetration times for bentonite and the highest for kaolin. The kind and properties (e.g. radius of hydrated ions) play in this case an important role. The empiric series of wettability, depending on clay mineral and surface cation were determined experimentally. Similar measurements were performed for clay minerals with increasing additions of humic acid and for different soils. On the basis of the measurements the surface free energy components apolar and polar (electron-acceptor and electron-donor) were calculated and correlated with the kind of clay mineral, surface cation and humic acid content. The investigations for soils show that the penetration times depend on the soil samples. Contact angle values for investigated samples were also calculated. From the water vapour adsorption measurements on the surfaces of modified clay minerals and soils the water film pressure values were calculated for one or three monolayers and compared with the work of adhesion and immersion. For soil materials surface free energy had real influence on structure formation or its changes. The organic matter and surface cations had an important role in creation of soil structure.
    Źródło:
    Acta Agrophysica; 1999, 17; 1-112
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości gleby pod okapem czterech gatunków drzew leśnych po 30 latach od ich posadzenia na dwóch różnych siedliskach
    Soil properties under the canopy of four forest tree species 30 years after planting on two different forest sites
    Autorzy:
    Mroziński, P.
    Modrzyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018330.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    siedliska lesne
    Larix decidua
    Quercus robur
    wlasciwosci fizyczne
    daglezja zielona
    lesnictwo
    Picea abies
    dab szypulkowy
    bor mieszany swiezy
    modrzew europejski
    wlasciwosci chemiczne
    gleby lesne
    Pseudotsuga menziesii
    las mieszany swiezy
    drzewa lesne
    swierk pospolity
    forest trees
    humus type
    soil properties
    site fertility
    central europe
    Opis:
    The main objective of this study was to demonstrate a relationship between the direction and effectiveness of impact of particular tree species on soil properties and the initial site fertility. The studies were conducted on two neighbouring experimental plots with different forest site types (fresh mixed coniferous forest – BMśw and fresh mixed deciduous forest – LMśw). The analysed species Norway spruce (Picea abies L. Karst.), European larch (Larix deciduas Mill.), Douglas fir (Pseudotsuga menziesii Franco) and penduculate oak (Quercus robur L.) were planted in three replications on 400 m2 plots. It was stated that: 1) the humification processes ongoing under the canopy of the analysed tree species are, to a large degree, determined by the type of forest site; 2) under the same tree species the content of calcium and nitrogen in the nitrate form was found to by markedly lower in the BMśw forest site; 3) in the BMśw forest site, the pH and electrolytic conductivity of the soil under the majority of the analysed tree species were lower; 4) the degrading impact of coniferous species on soil was noticeably stronger on the poorer BMśw forest site.
    Źródło:
    Sylwan; 2006, 150, 08; 26-37
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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