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    Tytuł:
    Określenie zagęszczenia drzewostanów z wykorzystaniem danych z lotniczego skanowania laserowego
    Determination of stand density using data from airborne laser scanning
    Autorzy:
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/994409.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany gospodarcze
    drzewostany sosnowe
    drzewostany mieszane
    inwentaryzacja
    zageszczenie drzew
    lotniczy skaning laserowy
    wysokosciowy model korony
    segementacja drzewostanu
    forestry
    segmentation
    chm
    accuracy
    Opis:
    Airborne laser scanning (ALS) technology allows collecting data describing top forest layer in a very accurate way. This provides a possibility to generate crown height models (CHM) with resolution in which single tree crowns can be detected. In presented study highly automatic algorithm for single tree detection is presented. FALCON II ALS acquired data in Forest Experimental Station in Rogów (central Poland). Data used for algorithm accuracy evaluation were acquired by measuring sample plots on VSD photogrammetric station. CHM with the resolution of 0.5 m has been used in the presented research. Algorithm, in automatic or semi−automatic way, defines single crowns. Each of the end segments was additionally processed for correctly defined size and area of the crown projection. Received accuracy of correctly detected trees was 69% for all samples (71% for pine stands and 61% mixed stands) in automatic method and 74% (78% and 65% respectively) in semi−automatic method.
    Źródło:
    Sylwan; 2013, 157, 08; 607-617
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technologia lotniczego skanowania laserowego jako źródło danych w półautomatycznej inwentaryzacji lasu
    Airborne Laser Scanner technology as a source of data for semi-automatic forest inventory
    Autorzy:
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009259.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy
    inwentaryzacja lasu
    inwentaryzacja polautomatyczna
    skanowanie laserowe
    fotogrametria
    lidar
    technika LIDAR zob.lidar
    urzadzenie LIDAR zob.lidar
    semi−automatic forest inventory
    photogrammetry
    forest management
    Opis:
    Airborne Laser Scanner (ALS) becomes a new tool acquiring very accurate data about forest environment. Basing on this data new methods of forest parameter extraction become available. Quality of the results of automatic methods and level of correlation to the field measurements allows presuming that in the future LIDAR can become an important tool in semi−automatic method of forest inventory.
    Źródło:
    Sylwan; 2010, 154, 02; 88-99
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie numerycznego modelu terenu i modelu pokrycia terenu do klasyfikacji drzewostanów na podstawie ich struktury pionowej i gatunkowej
    Using digital terrain model and digital surface model for stands classification basing on their species and vertical structure
    Autorzy:
    Stereńczak, K.
    Będkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/973898.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany
    klasyfikacja
    struktura drzewostanu
    struktura gatunkowa
    struktura przestrzenna
    Numeryczny Model Terenu
    Numeryczny Model Powierzchni Pokrycia Terenu
    lotniczy skaning laserowy
    leśnictwo
    digital terrain model
    digital surface model
    airborne laser scanning
    stand structure
    Opis:
    Aim of the presented study was to use DTM, DSM and CHM, generated from LIDAR data acquired in two year seasons, for forest species composition and structure analysis. Study was carried out in Głuchów Forest District (central Poland). Obtained results proved that using a DSM and DTM or DSM, DTM and CHM classification enables to reach 71−79 % of accuracy in forest stands classification.
    Źródło:
    Sylwan; 2011, 155, 04; 219-277
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dane społecznościowej informacji geograficznej jako źródło informacji o wykorzystaniu lasów w aglomeracji warszawskiej
    Volunteered Geographic Information data as a source of information on the use of forests in the Warsaw agglomeration
    Autorzy:
    Ciesielski, M.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/979107.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Warsaw agglomeration
    VGI
    Flickr
    GPS
    forest recreational function
    social media
    Opis:
    The purpose of this study was to present possibilities of using available Volunteered Geographic Information (VGI) created by users of Flickr to monitor activity in the forest areas within the Warsaw agglomeration. The paper indicates which forest complexes (municipal or agglomeration) were most frequently visited as well as the dates of the greatest use of forest areas in daily, weekly and monthly terms. The study objects include forest areas located in Warsaw and in 52 communes constituting the Warsaw agglomeration. The Kampinos National Park (KPN), which is under strong recreational pressure from the inhabitants of Warsaw agglomeration, was also analysed. In total, we used 1180 images from the Flickr portal in the study. The most visited place was the Kampinos National Park (18.7%), then the forest area in the Legionowo commune (10.7%), which constitute one large forest complex with forests in Choszczówka. Large, compact municipal forest complexes (e.g. Bielański and Linde (8.2%), Sobieski (7.4%) and Kabaty (5.3%)), as well as forests within the Mazowiecki Landscape Park (6.3%) were also very popular. Fraction of photos taken in municipal forests of Warsaw as well as in the agglomeration and KPN forests was larger on Saturdays and Sundays than on business days. It amounted to 51.7% and 59.3%, in forests of a given category respectively. Pictures from the agglomeration and KPN forest areas were most often taken in May (13.8%), while the least often in December (3.3%). Fraction of people visiting municipal forests of Warsaw was the largest in December (12.3%) and the lowest in July (5.0%). On a daily basis, the most activity in both categories was recorded between 11−18. The use of VGI data from the Flickr portal enabled spatial and temporal analysis of user activity in urban and suburban forests. The results obtained confirm current research using survey forms, but in contrast to them, they show the actual places visited for recreation. It should be emphasized that due to the privacy policy of portals, VGI data do not contain information about the metric and status of the user, which makes the analyses inadequate for the entire population.
    Źródło:
    Sylwan; 2020, 164, 08; 695-704
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność określania wybranych parametrów rozkładów pierśnic drzew w drzewostanach sosnowych za pomocą naziemnego skanowania laserowego
    Accuracy of the selected tree diameter distributions parameters assessed using terrestrial laser scanning in Scots pine stands
    Autorzy:
    Zasada, M.
    Sterenczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/994333.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    zasoby drzewne
    inwentaryzacja
    drzewostany sosnowe
    powierzchnie probne kolowe
    rozklad piersnic
    dokladnosc
    skanowanie laserowe
    forest inventory
    circular sample plots
    quadratic mean diameter
    percentile
    skewness
    kurtosis
    Opis:
    When using such methods as terrestrial laser scanning (TLS), one of the major factors influencing the accuracy of stand characteristics determination is the visibility of trees on a sample plot, which is often obscured by the shadow effect caused by trees located closer to the plot center. Because of this, the percentage of the identified trees and basal area depends on the distance from the plot center: the accuracy of stocking determination decreases as the plot radius increases. The values of such stand characteristics as average breast height diameter, standard deviation of tree diameters and percentiles of the tree diameters' distributions assessed based on all trees and the visible trees only are not significantly different from each other for circular sample plots with 20 m radius. Skewness and kurtosis are not significantly different in plots with radius of 5 and 10 meters. For the 15 m plot radius the difference was significant for about 15% of the analyzed plots. The obtained results correspond with previous findings that report that on the circular sample plots with radius up to 15 m the errors for the number of trees and basal area are relatively small and can be accepted in the practical inventory. The results support the circular sample plots size optimization, including measurements performed using a point cloud.
    Źródło:
    Sylwan; 2013, 157, 12; 883-891
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie danych społecznościowej informacji geograficznej do monitorowania ruchu w przestrzeni leśnej
    Application of the Volunteered Geographic Information data to monitor traffic in the forest area
    Autorzy:
    Ciesielski, M.
    Stereńczak, K.
    Balazy, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/980308.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    lasy
    tereny lesne
    uzytkowanie sportowe
    uzytkowanie rekreacyjne
    ruch turystyczny
    natezenie ruchu
    monitoring
    spolecznosciowa informacja geograficzna
    system GPS
    Sudety
    sports application
    gps
    forest recreational function
    the sudetes
    Opis:
    The purpose of this study was to present the possibilities of using available Volunteered Geographic Information (VGI) created by the users of OpenStreetMap program and sports applications such as GPies.com or Endomondo to monitor the traffic in the forest area. In addition, areas where, due to high traffic, potential conflicts between different user groups may occur, were marked out. The research area covered two mountain forest districts located in the Sudetes Mountains: Szklarska Poręba and Świeradów, which due to their tourist values and an extensive network of hiking and cycling trails arouse society’s interest. In the area, 2896 unique activities divided into cycling, running and hiking were registered. It was shown that 7.3% of the length of routes used by pedestrians, 13.6% of the length of routes for runners and 11.0% of the length of routes for cyclists are characterized by high intensity of traffic, while 30.3%, 28.4% and 37.7% of routes for the indicated groups, respectively, are characterized by medium intensity of traffic. On other routes, low intensity of utilization was observed. Existing hiking and cycling trails were pointed out as the most frequently used routes. The specially designed bicycle routes, the so−called ‘Single track’, located in the Świeradów Forest District, were popular among the users. The highest traffic occurred in the morning and afternoon, on weekends and in the summer months. According to the adopted assumptions, there is a high risk of conflicts between runners and cyclists at about 1.5% of the route length as well as 2.1% of the length of routes used simultaneously by pedestrians and cyclists. It should be stated that VGI data can be used to monitor traffic in forest areas and constitute one of the elements of the decision support system (DSS). A certain weakness of VGI data from the sports applications used in this study could be the lack of the possibility of creating user profiles. Consequently that causes lack of more detailed data on this subject (age, sex, etc.). The limitation in the data useage is the privacy policy, which allows downloading only such data that has been made available for public use in the application resources.
    Źródło:
    Sylwan; 2019, 163, 01; 80-88
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detekcja posuszu kornikowego z wykorzystaniem zobrazowań BlackBridge na przykładzie drzewostanów Sudetów i Beskidów
    Detection of bark beetle infected trees with BlackBridge image on the example of the Sudety and the Beskidy mountains
    Autorzy:
    Kycko, M.
    Stereńczak, K.
    Bałazy, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/989357.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Beskidy Zachodnie
    Sudety
    lasy gorskie
    drzewostany swierkowe
    drzewa martwe
    posusz
    teledetekcja
    zdjecia satelitarne
    zobrazowania BlackBridge
    blackbridge
    condition of forests
    satellite image classification
    mountain areas
    Opis:
    BlackBridge imagery is one of the new means of information used in forest condition analysis. Rapid Eye satellite data with a 5 m spatial resolution register spectral information from 440 to 850 nm through 5 spectral bands. This range of electromagnetic spectrum provides information on plant chlorophyll content as well as cell structure. Such data allows to monitor vegetation condition. This paper focuses on a research conducted in the Sudety and Western Beskidy mountains (southern Poland). The aim of the research was to verify whether high resolution satellite imagery is applicable in detection of the damages caused by Ips typographus and acid rain in Norway spruce dominated stands through supervised classification. BlackBridge Rapid Eye satellite images from 2012 and 2013 were analysed. Various modifications of classification methods were tested, including change in combination of spectral bands. Each method resulted in different classification accuracy. Best results were observed in case of the Maximum Likelihood classification method applied on all spectral bands. The analysis showed that the time of the image registration has a significant impact on classification results. The average classification accuracy for 2012 images was 0.53, whereas for 2013 – 0.69. Moreover, information gathered from 5 m pixels is too general to classify individual dead trees in a precise manner. Tested methods are applicable only in detection of clusters of dead trees.
    Źródło:
    Sylwan; 2016, 160, 09; 707-719
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modele stosowane do opisu architektury drzew i możliwości ich praktycznego wykorzystania w leśnictwie
    Tree architecture descriptive models with forestry applications
    Autorzy:
    Kędra, K.
    Stereńczak, K.
    Gazda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/978911.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    forest modelling
    forest ecosystems
    remote sensing
    geometry
    Opis:
    The qualitative and quantitative descriptive models of tree architecture differ in the degree of complexity and the way of mapping tree structure, and thus, are of varied use in forestry. The qualitative, Hallé−Oldeman models, serve as a framework for analyzing tree architecture and help define the different components of a tree branching system. Among the quantitative models (here: horizontal, three−dimensional or vertical ones) the horizontal representations are the most parsimonious, and proved to be useful for examining the effects of competition process and the light conditions within the forest understory. The three−dimensional representations (Quantitative Structural Models; QSMs) have the widest range of applications as they may be used for deriving both the two−dimensional traits (such as crown length or branch height) and the volumetric traits (such as tree crown volume or wood volume). At the same time they are the most complex ones. The vertical models were used to study the impact of local terrain shape and wind conditions on tree architecture, but the way of deriving such models from the QSMs seems excessively laborious. However, we highlight here also a photogrammetric method, which allows to obtain an analogous model in much simpler way. Both three−dimensional and vertical representations are useful for determining the wood quality features. Three−dimensional models can be used to accurately measure tree woody biomass, while horizontal models can be used for reliable biomass estimations.
    Źródło:
    Sylwan; 2020, 164, 09; 707-718
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zależność między pierśnicą a cechami koron uzyskanymi z lotniczego skanowania laserowego
    Relationship between dbh and crown characteristics derived by airborne laser scanner
    Autorzy:
    Zasada, M.
    Stereńczak, K.
    Brach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/973712.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lasy
    skanowanie laserowe
    lidar
    korony drzew
    pomiary
    powierzchnia rzutu korony
    piersnicowe pole przekroju
    leśnictwo
    drzewa leśne
    pierśnice drzew
    pierśnicowe pole przekroju
    airborne laser scanning
    dbh
    crown parameters
    Opis:
    The main goal of the study was the determination of the relationship between selected crown parameters derived from automatically processed airborne laser scanning (ALS) data and tree diameter. It has been found that the best set of features for that purpose is crown projection area (CPA) as a predictor and tree basal area (BA) as dependent variable. Two algorithms of crown segmentation (‘growing’ and ‘pouring’) have been analysed. Weibull, exponential and hyperbole functions have been the best for description of the relationship between CPA and BA. The relationship between tree diameter and crown characteristics was significant, but relatively weak. This can be attributed to the fact, that the relationship can be modified by various stand characteristics. Including such variables as tree stocking and crown closure should improve the model significantly.
    Źródło:
    Sylwan; 2011, 155, 11; 725-735
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wymiar fraktalny jako sposób opisu złożoności przestrzeni leśnej
    Fractal dimension as a tool for description of forest structure complexity
    Autorzy:
    Tracz, W.
    Mozgawa, J.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/973855.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany
    korony drzew
    powierzchnia
    wymiar fraktalny
    obliczenia
    leśnictwo
    fractal dimension
    shape complexity
    surface roughness
    canopy surface
    Opis:
    The paper describes the procedure of calculation of surface fractal dimension based on using raster datasets: preprocessed LIDAR data. The procedure was used to assess the surface complexity of forest stand canopy. Relationships between size of the pixels of raster image and fractal dimension of canopy surface presented on that image were recognized. Dependence of fractal dimension on age and species composition of a stand was also found.
    Źródło:
    Sylwan; 2011, 155, 06; 384-392
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie lotniczej teledetekcji hiperspektralnej w klasyfikacji gatunkowej lasów strefy umiarkowanej
    Airborne hyperspectral data for the classification of tree species a temperate forests
    Autorzy:
    Wietecha, M.
    Modzelewska, M.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/987129.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    strefa umiarkowana
    teledetekcja
    dane hiperspektralne
    wykorzystanie
    lasy
    sklad gatunkowy
    drzewa lesne
    klasyfikacja
    remote sensing
    hyperspectral data
    tree species classification
    Opis:
    The review focuses on use of airborne hyperspectral imagery in forest species classification. Studies mentioned in the review concern hyperspectral image classification with use of various methods. Only research, where study area is located in Europe or North America were selected. Articles were reviewed with respect to used pre−processing methods, methods of feature selection or feature extraction, algorithms of image classification and trees species which were classified. The whole process of acquiring and working with hyperspectral data is described. Different approaches (e.g. use or skip atmospheric corrections) were compared. In each article, various deciduous and conifer species were classified. Studies comparing several classification algorithms (Spectral Angle Mapper, Support Vector Machine, Random Forest) were mentioned. In most cases SVM gives the best results. Species, which are classified with the highest accuracy, include Scots pine (Pinus sylvestris) and Norway spruce (Picea abies). Broadleaved species are, in general, classified with lower accuracy than conifer ones. Within broadleaved trees, European beech (Fagus sylvatica) and oaks (Quercus sp.) are classified with the highest accuracy.
    Źródło:
    Sylwan; 2017, 161, 01; 3-17
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uwarunkowania tworzenia programów uniwersyteckich studiów leśnych
    Conditions for elaboration of university curricula in forestry
    Autorzy:
    Paschalis-Jakubowicz, P.
    Bijak, S.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008728.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    edukacja lesna
    szkoly wyzsze
    kierunki studiow
    lesnictwo
    programy nauczania
    wymagania
    higher education
    forestry
    curricula
    Opis:
    Forestry education at university level has a long and rich tradition, dating back to the nineteenth century. Since then there have been many fundamental changes both in defining the objectives and methods of education of foresters−to−be, because conducting education in the rapidly changing forest management requires a continuous adaptation of the curricula to the requirements of the development of civilisation. The challenge of forest education at the university level in the twenty first century is to find appropriate educational ways and tools referring to the paradigm shift expressed by the transition from teaching to learning, also as a constant process. Presentation of clear and effective methods of evaluating the quality of education and competencies acquired by graduates of university studies forest is of a great importance as well.
    Źródło:
    Sylwan; 2012, 156, 08; 572-580
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określenie rozdzielczości przestrzennej wielospektralnych zdjęć satelitarnych optymalnej do detekcji martwych drzew na obszarach leśnych
    Determining the spatial resolution of multispectral satellite images optimal to detect dead trees in forest areas
    Autorzy:
    Pluto-Kossakowska, J.
    Osińska-Skotak, K.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/989024.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    teledetekcja
    lasy
    Beskid Zywiecki
    Nadlesnictwo Ujsoly
    tereny lesne
    drzewa martwe
    detekcja
    zdjecia satelitarne
    zdjecia wielospektralne
    rozdzielczosc przestrzenna
    vhr image
    vegetation index
    multispectral analysis
    image classification
    Opis:
    The mainstream of remotely sensed methodology for identifying the tree stand condition is based on spectral responses registered by a multispectral sensor as a digital image. The changes in spectral properties are caused by dying leaves, needles or whole trees. In further steps, the relationship between the spectral values (radiometry) registered in a multispectral satellite image and the health condition of trees should be determined. The most frequent situation includes the one whem dying stand (sensu single tree) occupies the area of <5 m². Therefore the remotely sensed data for determining sanitary conditions of trees must be of a very high spatial resolution (e.g. WorldView2 or 3, GeoEye−1, Pleiades) on one hand and at the same time favourable for the vegetation studies, i.e. utilizing suitable spectral bands and be of low acquisition cost (e.g. RapidEye, LANDSAT−7, ETM +, LANDSAT−8 OLI). Thus a compromise between spatial and spectral resolution should be found to answer the question at what resolution it is possible to clearly separate the damaged tree. The scope of the research included testing of selected methods of satellite image processing and analysis in terms of defining the optimal spatial resolution, which was performed on simulated images obtained for the area of the Beskidy Mountains (S Poland). Pixel size on simulated images was downgraded to the size corresponding to the currently functioning satellite systems. Consequently the obtained material for comparison was free from influence of external factors such as the differences in: time and weather conditions, the geometry of satellite image acquisition, light at the surface of the treetops and phenological vegetation. For each image we used vegetation indices (NDVI and GDVI) and supervised classification. These tests and the obtained results allowed to draw conclusions about the optimal satellite image resolution that can be used to detect damaged or dead stands.
    Źródło:
    Sylwan; 2017, 161, 05; 395-404
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena dokładności obrębowej metody inwentaryzacji lasu opartej na losowaniu warstwowym
    Assessment of the accuracy of the forest district inventory method based on the stratified sampling
    Autorzy:
    Bruchwald, A.
    Miścicki, S.
    Dmyterko, E.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/988954.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    miazszosc drzewostanow
    inwentaryzacja lasu
    metoda obrebowa
    losowanie warstwowe
    dokladnosc
    auxiliary variable
    dominant tree species
    sample allocation
    stratum
    Opis:
    The aim of the research was to assess the accuracy of the stratified sampling method used to estimate the standing volume of a forest district and to compare it with the accuracy of simple random sampling methods. The paper presents the variability of the variables affecting the accuracy of the stratified sampling method. We attempted to find the ways to increase this accuracy. The research was based on the empirical material collected on approximately 42,000 sample plots with a size of 50−500 m², and with an average of 737 plots per forest district. The standard deviation of the merchantable volume of trees on sample plots ranged from 87 to 213 m³/ha, with an average of 128 m³/ha. The coefficient of variation ranged from 5.3 to 28.5% (the average 40.8%). Using a simple random sampling method, the standard error of the volume ranged from 3.3 to 10.0 m³/ha (the average 4.8 m³/ha) and the relative error – from 1.01 to 3.41% (the average 1.55%). The absolute error of the stratified sampling method under which strata are formed on the basis of the main tree species and its age ranged from 2.9 to 7.4 m³/ha, the average 4.2 m³/ha, and the relative error ranged from 0.65 to 1.95%, 1.02% on average (tab.). The accuracy of the stratified sampling method was by 15% higher than that of the simple random sampling method. We found that the relationship between the volume of a sample plot and the main tree species and its age measured by the correlation coefficient was 0.453 on average. For the relationship between volume and age of stands this coefficient was on average 0.422, while between volume and main tree species – only 0.118. Stand age – as an auxiliary variable in formation of strata – proved to be of moderate usefulness resulting from a small difference in the standing volume of stands in older age classes. Main tree species turned out to be of slight usefulness in formation of strata, therefore it seems reasonable to find some other auxiliary variables to replace it.
    Źródło:
    Sylwan; 2017, 161, 11; 909-916
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porównanie sposobów określania składu gatunkowego drzewostanów obrębu leśnego
    Comparison of the methods of determining the tree species composition of stands in a forest district
    Autorzy:
    Bruchwald, A.
    Miścicki, S.
    Dmyterko, E.
    Stereńczak, K.
    Wysocka-Fijorek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/985705.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    sklad gatunkowy
    struktura gatunkowa
    metody badan
    analiza porownawcza
    obreby lesne
    basal area
    cover
    diversity
    sample plot
    survey
    volume
    Opis:
    In Polish forest management planning, the species composition of stands in a forest district is established by adding up the volumes of tree species from individual forest stands. These volumes are calculated according to the estimated share of species cover and the estimated volume of the entire forest stand. The species structure of stands in a forest district, established on the basis of such a method, may be different than that obtained from sample plots. The aim of the study was to compare three ways of determining the tree species structure of stands in a forest district. In Method 1, the species composition was estimated on the basis of the volume of trees measured on sample plots as part of a periodic forest inventory based on stratified sampling. The same data were used in Method 2, but the share of species was calculated on the basis of the basal area. In Method 3, the species structure was estimated according to the volume of trees estimated in each forest stand based on the cover of a given species. The empirical material was collected in 53 forest districts. In method 1 and 2, data from an average of 740 sample plots within the forest district were used. In Method 3, data from the forest stand descriptions contained in the database of the State Forests Information System were used. For each forest district, species composition was calculated, including 6 tree species and 8 groups of tree species. For all forest districts, the average shares of individual species and groups of species differed, depending on the applied method (tab. 1). In case of methods 1 and 2, the biggest difference was found for pine – the most numerous species – but it was also big for less numerous ones: birch and oak (tab. 2). In case of methods 1 and 3, the biggest difference in share was also found for pine (tab. 3). The greater the species diversity of a forest district (determined according to Simpson’s index of diversity), the greater was the average difference in the estimated share of an individual species (figs. 1 and 2). The method of determining the species structure in a forest district used in forest management practice nowadays was considered insufficient. It was proposed to establish it in larger units (subclass, age class, forest district) only according to the volume of trees measured on the sample plots (without rounding and ‘switching’ of species), using the stratified sampling method.
    Źródło:
    Sylwan; 2019, 163, 05; 365-372
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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