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Wyszukujesz frazę "growing stock" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Pomiar zapasu grubizny z wykorzystaniem zdjęć lotniczych
    Inventory of merchantable timber volume using aerial photography
    Autorzy:
    Miścicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012035.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    inwentaryzacja
    zapas grubizny
    drzewostany
    lesnictwo
    powierzchnie probne
    zdjecia lotnicze
    pomiary
    growing stock
    aerial photography
    inventory
    permanent sample plot
    airphoto sample plot
    two−phase
    method
    Opis:
    Inventory of the growing stock in the territory of the Milicz Forest District was made using the combined, two−phase method. 1980 sample plots were measured on aerial photographs that constituted Phase I of the inventory. Phase II sampling consisted of 267 ground (permanent) plots and corresponding airphoto plots depending on their location in the photograph. In the airphoto sample plots, the following characteristics were measured (or controlled): tree height and age, degree of crown cover, species composition. Taking into consideration the relationship between the results of standing volume measurements on ground sample plots and stand characteristics on airphotos, the growing stock in age sub−classes and in the entire Forest District was calculated. Using aerial photography in forest survey and growing stock inventory, the cost of forest management planning operations is likely to be comparable to the cost of such operations performed in the traditional way.
    Źródło:
    Sylwan; 2009, 153, 06; 373-385
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aktualizacja zapasu drzewostanów na podstawie danych z SILP i stałych kontrolnych powierzchni próbnych
    Updating of stands timber volume on the basis of the data from State Forest IT system [SILP] and permanent control sample plots
    Autorzy:
    Miścicki, S.
    Nowicka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013391.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    przyrost miazszosci
    aktualizacja
    lesnictwo
    powierzchnie probne
    uzytkowanie rebne
    System Informatyczny Lasow Panstwowych
    zapas drzewostanu
    silp
    permanent sample plots
    growing stock
    update
    utilization
    current periodical volume increment
    bayesian estimation
    Opis:
    The results of measurements of permanent control sample plots (skpp) were used to update the growing stock of individual stands in the State Forests IT System (SILP). The calculation was based on Bayesian estimation. Several update methods were used differing in the principles of estimating the initial growing stock. The growing stock update results for the whole forest and individual age classes were similar for all the applied methods. The volume of the estimated increment and the recorded cuts in SILP was lower compared to the measurement results in skpp. In addition to the periodical correction of the SILP data, the application of skpp would enable reduction in the intervals between the growing stock inventories (to 20−30 years) performed on the basis of a relatively large number of temporary sample plots.
    Źródło:
    Sylwan; 2008, 152, 11; 26-39
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określanie wybranych cech drzewostanów sosnowych z wykorzystaniem chmur punktów pozyskanych w procesie automatycznego dopasowania cyfrowych zdjęć lotniczych
    Estimating selected characteristics of Scots pine stands based on point clouds derived from automatic matching of airborne images
    Autorzy:
    Hawryło, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/986689.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    fotogrametria
    zdjecia lotnicze
    automatyczne dopasowanie zdjec lotniczych
    chmura punktow
    drzewostany sosnowe
    wysokosc Loreya
    pole powierzchni przekroju piersnicowego
    zasobnosc drzewostanu
    dokladnosc szacowania
    modele predykcyjne
    area−based approach
    forest inventory
    lorey's height
    basal area
    growing stock volume
    Opis:
    Recent research show that image−derived point clouds (IPC) can be successfully utilized in the context of estimation of selected forest parameters. However there are still some topics for further investigation in the context of using archival data. Particularly, in case of forest stands in Poland the number of such studies is limited. This study investigates the usefulness of airborne IPC for estimation of Lorey's height (H), basal area (G) and growing stock volume (V) of Scots pine stands. Additionally, the accuracy of predictive models is analyzed for images acquired in the same year as the field reference data were collected (2015) and for archival images acquired in 2012. The study was performed in Janów Lubelski Forest District (south−eastern Poland) on approximately 7,800 ha. The measurements from 94 circular plots were used as the reference data. The Area Based Approach and multiple linear regression were used to create predictive models. For each analyzed dependent variable variety of IPC characteristics were evaluated to select the most accurate predictive models. The best model for each variable was selected based on Akaike Information Criteria and RMSE. The same predictor variables were used for both years of aerial images aquisition. For models comparison the one−sided bootstrap test was used. The RMSPE for H, G and V in case of images acquired in 2015 amounted to 5.3, 16.3 and 17.3%, respectively. Analogically, the relationship between predicted and observed values (R2) amounted to 0.96, 0.47 and 0.81. The finally selected models had three, one and two predictors for H, G and V, respectively. The difference between accuracy of models based on aerial images from 2012 and 2015 was not statistically significant for all analyzed variables. The obtained results show high potential of using airborne image−derived point clouds for forest inventory activities in Scots pine dominated stands.
    Źródło:
    Sylwan; 2017, 161, 09; 707-714
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Etat według potrzeb hodowlanych dla różnowiekowych lasów o strukturze przerębowej lub do niej zbliżonej
    Prescribed yield determined by silvicultural needs for uneven-aged forests with selection or similar structures
    Autorzy:
    Poznański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011824.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany roznowiekowe
    gospodarka lesna
    rebnie stopniowe udoskonalone
    przyrost miazszosci
    rebnie przerebowe
    etat wg potrzeb hodowlanych
    lesnictwo
    zapas drewna
    etat rebny
    selection felling system
    improved shelterwood felling system
    prescribed yield according to silvicultural
    needs
    growing stock
    volume increment
    Opis:
    Management activities in uneven−aged forests are based on a prescribed yield subjectively set by an inspector according to silvicultural needs. The findings show that in uneven−aged selection stands prescribed yield was calculated at a lower level than in irregular shelterwood stands. Prescribed yield determined by silvicultural needs differ from actual yield, so it does not meet the actual silvicultural needs of uneven−aged stands and therefore should not be recommended for use in the forest management practice any more.
    Źródło:
    Sylwan; 2009, 153, 03; 158-163
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ efektu brzegowego drogi na cechy drzewostanów sosnowych Puszczy Noteckiej
    Edge-effect of the road on the Scots pine stands characteristics in the Notecka Forest
    Autorzy:
    Grajewski, S.M.
    Mizera, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989417.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Puszcza Notecka
    drogi publiczne
    drogi o malym natezeniu ruchu
    oddzialywanie na srodowisko
    efekt brzegowy
    drzewostany sosnowe
    cechy taksacyjne
    zasobnosc drzewostanu
    miazszosc drzew
    road−edge effect
    diameter at breast height
    growing stock
    forest stand value
    very low−volume roads
    Opis:
    The development of the transportation network brings both benefits and threats. Much attention is paid to soil contamination with trace elements, difficulties in animal migration, noise propagation or synanthropisation of the vegetation cover. This paper deals with the effect of provincial road No. 150 on inventory characteristics of neighboring Scots pine stands in the Notecka Forest (western Poland) – one of the larger forest complexes in Europe. Twelve rectangular experimental sites were established perpendicular to the road axis, called belt transects. Each transect consisted of 3−4 plots located at different distances from the pavement edge (fig.). Measurements and estimations were recorded for the plots. Values from all belt transects were approximated within plots at the same distance from the road and then compared using statistical methods. Observations were conducted in Scots pine stands growing on fresh coniferous forest (Bśw) and fresh mixed coniferous forest (BMśw) sites. Reduced stand density that resulted in decreased basal area, volume and growth rates were observed in the immediate vicinity of the road compared to the forest interior. Individual trees were thicker, but more often burdened with defects decreasing timber value. Any considerable effect of the road on tree height wasn't observed. The above mentioned changes were more evident in poorer habitat conditions, while the location in relation to the road had no significant effect. Modified lighting conditions are probably the main cause of these changes. At the edge of Scots pine stands in the Notecka Forest, a unique ecotone has formed under the influence of the provincial road.
    Źródło:
    Sylwan; 2016, 160, 11; 915-922
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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