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    Wyświetlanie 1-5 z 5
    Tytuł:
    System Dynamic Modelling and Simulation for Cultivation of Forest Land: Case Study Perum Perhutani, Central Java, Indonesia
    Autorzy:
    Musi, C.
    Anggoro, S.
    Sunarsih, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/125387.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    dynamic model
    tenant farmers
    production sharing
    forest land cultivation
    Opis:
    The deforestation and forest degradation rates have a propensity to rise every year. The problems in pertaining with the issue is not solely preoccupied on the ecological concern but also to the socio-economic impacts. The complexity of forest management is a serious barrier in determining a better management policy. Modeling system is a simple method to describe the real situation in nature. A qualitative approach is used to identify the relationship between the dynamics of important behaviors. The causal relationships among the factors were investigated by using causal loop diagram. The model conceptualization was constructed by using a stock-flow diagram. The result of the simulation model was used to determine the alternative policies for better forest management. The results indicated that the tenant welfare would be enhanced through the provision of production-sharing by 25% and the Corporate Social Responsibility by 2%, which yields a reduction in cultivated area of 916.61 ha within a period of 67 years or a decline of land area by an average of 13.68 ha per year.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 4; 25-34
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The structure of Prunus avium L. crops and their importance for pollinating insects in seed orchards in Poland
    Autorzy:
    Kęsy, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1830640.pdf
    Data publikacji:
    2021-09-29
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    seed production
    forest crops
    tree yielding
    plant cultivation
    Opis:
    The functioning of forests in Poland is often associated with a productive role and the production of wood-based raw materials, disregarding the need to protect forest environments. In practice, the approach to the protection of nature and animals, including insects in forest areas, has changed in recent decades. Many researchers still point to the need to protect the processes taking place in forest environments. Actions are being taken to reduce monocultures in forests and to increase the biodiversity of plants and animals living among crops. A good example described in this paper is the relationship between seed plantations and insects. These relationships may have a positive effect on the fruiting process and seed production in selected tree species. This paper presents an example of the relationship between wild bees and Prunus avium L. seed plantations as an example of a positive relationship in which humans as well as pollinating insects can benefit. The structure and size of Prunus cultivation in Poland are described and the hitherto harvest of seeds is analysed. The elements of the biology of the Prunus species, important for the process of pollination of flowers by insects are also indicated. The study also indicates ways to protect bees in the forest environment.
    Źródło:
    Acta Universitatis Lodziensis. Folia Biologica et Oecologica; 2021, 17; 79-83
    1730-2366
    2083-8484
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Biologica et Oecologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Autovegetative reproduction in conservation and selective cultivation of Norway spruce Picea abies (L.) Karst of Istebna race
    Autorzy:
    Rylski, K
    Powiązania:
    https://bibliotekanauki.pl/articles/41485.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    autovegetative reproduction
    plant reproduction
    conservation
    selective cultivation
    Norway spruce
    Picea abies
    forest tree
    rooting experiment
    cutting
    progeny
    Opis:
    The paper discusses the results of rooting experiments conducted with the cuttings obtained from 8-year-old spruce trees of Istebna race. The studies investigated the effects of endogenous factors, such as the place of extraction, length and origin of cuttings, and an exogenous factor, which is a rooting stimulus.
    Źródło:
    Dendrobiology; 2004, 51 Supplement
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Species diversity and litter dynamics in secondary mixed deciduous forest, Thung Salaeng Lung National Park, Northern, Thailand
    Autorzy:
    Podong, C.
    Poolsiri, R.
    Katzensteiner, K.
    Pengthamkeerati, P.
    Thongdeenok, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/38576.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    species diversity
    species composition
    carbon
    nitrogen
    litter dynamics
    secondary mixed deciduous forest
    shifting cultivation
    Thung Salaeng Lung National Park
    Thailand
    Opis:
    This study present species composition and potential of litter on carbon and nitrogen return in secondary mixed deciduous forest after shifting cultivation. The dominant species of trees were Haldina cordifolia, Albizia odoratissima and Lagerstroemia duperreana. The Important Value Index (IVI) values of trees were 132.91, 17.78 and 14.22, respectively. The pattern for the decomposition coefficients (k) was highest in the wet period (May–September) and lowest in the dry period (October–April). The carbon and nitrogen return patterns increased in the dry period (October– April) and decreased in the wet period (May–September). Carbon and nitrogen loss in the decomposing litter continually decreased during the decomposition process from the initial levels, with a final relatively rapid release in the wet period. Results from this study was understanding of community composition, litterfall production and litter decomposition for understanding potential of secondary mixed deciduous forest for balancing carbon for mitigating greenhouse gas effect in the local area.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 4
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantity and quality of organic matter in forest and arable soils developed from sand and loess
    Autorzy:
    Smal, H
    Misztal, M.
    Ligeza, S.
    Dyminska-Wydra, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1450660.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    organic matter
    ecological condition
    soil type
    humic substance
    loess
    organic carbon fraction
    arable soil
    forest biocenosis
    soil constituent
    quantity
    sand
    soil
    sandy soil
    soil cultivation
    quality
    terrestrial ecosystem
    Opis:
    Eight sandy and three loess forest and arable soils taken from the S-E region of Poland were used in the study. The following fractions of C were determined: total organic carbon, fraction soluble in 0.5 mol NaOH dm-3 (humic acids + fulvic acids), humic acids, fulvic acids, fraction soluble in 0.5 mol H2SO4 dm-3 (hemicelluloses) and residue. Quantity and quality of organic matter depended on horizon and soil use. The highest content was shown by fraction of humus acids and residue, whereas the lowest - hemicelluloses fraction. In most soils C ratio of humic to fulvic acids exceeded 1.0. On average, in humus horizons, it was higher in arable than in forest soils and in loess as against sandy soils. In sandy soils, a slightly higher content of humus fraction and lower residue one than in loess soils was found.
    Źródło:
    Acta Agrophysica; 2001, 50; 225-234
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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