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Tytuł:
Dokładność określania świeżej masy strzał jodły na podstawie przeliczników wagowo-objętościowych
Accuracy of estimation silver fir stem mass on the basis of volume to weight conversion factors
Autorzy:
Ochal, W.
Wertz, B.
Grabczyński, S.
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/985798.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
biomasa drzewna
masa strzaly drzew
biomasa swieza
szacowanie biomasy
wspolczynniki wagowo-objetosciowe
gestosc drewna
abies alba
wood density
stem biomass
biomass estimation
Opis:
The paper describes the accuracy of estimation of silver fir stem fresh mass on the basis of volume to weight conversion factor, derived from samples, collected from few different places along the stem. The research material contained 13 sample trees selected from homogenous 70−years old stand, situated in mountainous area of the Beskid Sądecki in Polish part of the Carpathians (S Poland). Volume over the bark of sample trees was calculated with section−wise method and the whole stem fresh biomass was directly weighted. For each sample tree three stem discs were collected at 1/6, 1/2 and 5/6 of tree height, their weight and volume were precisely determined and the biomass conversion factors (equivalent of stem density) were calculated. The assessment of the accuracy of whole fresh stem biomass was conducted according to five variants: for the biomass conversion factors derived from each individual stem disc (lower, middle or upper), from weighted mean density and on the basis of the constructed mixed model, where relative height and diameter were treated as fixed effects and influence of individual trees was included as a random term. The volume of sample fir stems ranged from 0.15 to 2.22 m3, while their fresh biomass varied between 138.1 and 1896.7 kg. Obtained results show that variation of the density was higher within stems than between them (coefficient of variation amounted to 8.4% i 3.3% respectively). The average density increased along stem, from 835.6 kg/m3 for lower part (1/6H) to 986.8 kg/m3 for the upper part (5/6H). Estimating the biomass on the basis of just lower stem disc resulted in the average relative error equal to –5.8%, while for middle stem disc the error was +1.2%, and for upper disc +11.3%. The use of conversion factors derived from weighted average density of all three stem discs resulted in average bias equal to –1,7% with standard error 1,0%. Despite the presence of mean bias of –2.3%, the constructed density model gave the most precise estimation of the stem biomass (standard error 0.7%), which indicates the reasons for its further improvements and usage.
Źródło:
Sylwan; 2018, 162, 04; 277-287
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Szerokość pasma jądrowego estymatora rozkładu pierśnic w drzewostanach olszy czarnej (Alnus glutinosa (L.) Gaertn.) z zachodniej części Kotliny Sandomierskiej
Bandwidth of kernel estimator of DBH distribution in black alder (Alnus glutinosa (L.) Gaertn.) stands from west part of the Sandomierz Basin
Autorzy:
Pogoda, P.
Ochał, W.
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/985919.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
drzewa lesne
olsza czarna
Alnus glutinosa
piersnice drzew
rozklad piersnic
estymacja
estymatory jadrowe nieparametryczne
kernel estimator
bandwidth
dbh structure
black alder
Opis:
Set of ‘nonparametric’ methods, that don’t make a priori assumption about functional form of empirical distribution was developed as an alternative to the parametric distribution modeling. The kernel estimators are one of such methods, that can be used to describe the frequency of data representing for example DBH records. Kernel smoothing requires the choice of weighting function and bandwidth also called as smoothing parameter or window. The lack of comprehensive analysis on the applicability of particular bandwidth selection methods to model DBH structure gave an impulse to present investigation aimed at determining value and variability of smoothing parameter in black alder stands. The optimal bandwidth was obtained according to six different variants of plug−in method proposed by Altman and Léger. Presented investigations were based on DBH measurements collected in 163 managed black alder stands aged from 6 to 89 years, growing in the west part of the Sandomierz Basin (S Poland). We measured in total 22,530 black alders, from 48 to 359 in individual stand. Stands were characterized by: age, quadratic mean diameter, basal area, mean height, Reineke’s stand density index and standard deviation of DBH. Smoothing parameter was obtained by means of plug−in method with the pilot bandwidth selected by: Silverman’s rule of thumb (nrd0), Scott’s method (nrd), unbiased cross−validation (ucv), biased cross−validation (bcv), method of Sheather and Jones (sj) and one−stage method of Wand and Jones (onestage). The bandwidth was first obtained to real data, then to 100 bootstrap samples of 5, 10, 15 ... and 100 trees from each stand. Smoothing parameters were characterized by mean and variance. Relationship between values of smoothing parameter and stand characteristics was determined. Finally the influence of sample size on value and variability of bandwidth was assessed. Value and variability of smoothing parameter in black alder stands are determined by stand age, sample size and method of bandwidth choice. There is a close relationship between bandwidth and the mean height (r from 0.75 to 0.83), quadratic mean diameter (r from 0.79 to 0.88) and standard deviation of DBH (r from 0.84 to 0.93). Potentially these stand features can be used to predict smoothing parameter values. Minor changes of bandwidth for samples containing above 50 trees together with persistence of standard error give an objective grounds for defining optimal number of diameters, that are necessary to kernel estimation of DBH distribution.
Źródło:
Sylwan; 2018, 162, 05; 411-421
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena przydatności wybranych funkcji do modelowania rozkładu pierśnic w drzewostanach olszy czarnej (Alnus glutinosa (L.) Gaertn.)
Evaluation of usefulness of selected functions for modeling distribution of breast height diameter in black alder stands (Alnus glutinosa (L.) Gaertn.)
Autorzy:
Orzeł, S.
Pogoda, P.
Ochał, W.
Powiązania:
https://bibliotekanauki.pl/articles/988989.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany olszowe
struktura grubosci
olsza czarna
Alnus glutinosa
piersnice drzew
rozklad piersnic
rozklad teoretyczny
aproksymacja
modelowanie
funkcja gestosci prawdopodobienstwa
test Kolmogorowa-Smirnowa
diameter at breast height
diameter distribution
probability density function
kolmogorov−smirnov test
Opis:
We evaluated the usefulness of ten theoretical probability density functions for the approximation of the breast height diameter distributions in managed alder stands growing in the western part of the Sandomierz Basin (southern Poland). The study material consisted of measurement results for 22,530 alders obtained for 844 circular sample plots, established in 163 stands aged 6−89. In the area of particular stands, from 2 to 10 age−dependent circular sample plots sized 0.01−0.10 ha were systematically arranged. We evaluated the following theoretical probability distributions: normal (N), double normal (P−N), Johnson SB (J), Weibull (W), beta (B), Burr (Bu), gamma (G), log−normal (L−N), log−logistic (L−L) and Birnbaum−Saunders (B−S). Additionally the usefulness of the W, B, Bu, G, L−N, L−L and B−S distributions with omitted location parameter was tested. The goodness−of−fit of each probability density function was assessed based on the Kolmogorov−Smirnov statistic, the root mean square error and ranks established on their basis. It was found that DBH distribution of majority stands is characterized by right−sided asymmetry and negative kurtosis. It was showed that the best distribution for the breast height diameter structure approximation of alder stands is the Johnson SB (J) distribution. To describe the frequency of thickness, normal (N) and log−logistic (L−L) distribution should not be used. Elimination of location parameter significantly affects usefulness of probability density functions to modeling empirical distributions of breast height diameter. Gamma and Burr distributions with omitted location parameter gave the best results in description the frequency of breast height diameter. In certain situations, these distributions can also be used to describe the structure of breast height diameter of alder stands.
Źródło:
Sylwan; 2017, 161, 02; 101-113
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność stałych krzywych wysokości dla drzewostanów olszy czarnej (Alnus glutinosa (L.) Gaertn.)
Accuracy of the uniform height curves for black alder (Alnus glutinosa (L.) Gaertn.) stands
Autorzy:
Ochał, W.
Orzeł, S.
Siudak, K.
Zamyślewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/989648.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
drzewostany olszowe
drzewa lesne
olsza czarna
Alnus glutinosa
piersnice drzew
wysokosc drzew
stale krzywe wysokosci
h−d relationship
uniform height curve
forest inventory
black alder
Opis:
The study presents the assessment of the accuracy of two generalized height−diameter models, such as skwB [Bruchwald et al. 2001] and skwO [Orzeł et al. 2014], developed in Poland for black alder (Alnus glutinosa (L.) Gaertn.) stands. Verification of these models was conducted on empirical material that was collected in 127 alder stands located in the western part of Sandomierz Basin (southern Poland). Selected alder stands aged 6−89 years, while average breast height diameter ranged from 4.5 to 43.0 cm and average height from 6.3 to 32.7 m. The stand density varied from 222 to 4360 trees/ha. The accuracy assessment for uniform height−diameter curves was based on the analysis of single tree absolute error distributions. Synthetic indicators of goodness−of−fit, such as: average and standard errors, coefficients of variation and determination were calculated based on absolute errors. The final evaluation of the compared uniform height−diameter models results from the structure of the goodness−of−fit measures that was observed within all analyzed stands and within age classes of 20 years. The efficiency of uniform height−diameter models was also compared with stand height−diameter curve, which was developed based on the Näslund function. General height−diameter models overestimated height in alder stands on average from 0.26 (1.67) to 0.19 m (1.39%), based on skwB and skwO models, respectively. Bias depended on the age of stand and decreases from almost 3% in I age class to nearly 0.5% in IV and V age class. For both analyzed models, a positive systematic error was observed for the standardized breast height diameter. Bias in estimating the height of single stand depended on the accuracy of stand height estimations. In case of estimation based on the measurements of three trees height, bias in single stand can range from –13% to +14%. Due to the range and nature of observed systematic errors, uniform height curves should be applied to groups of stands that have different age and breast height diameter structure, as it allows for partial reduction of the error.
Źródło:
Sylwan; 2016, 160, 08; 635-646
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zawartość suchej masy w nadziemnej biomasie krzewów występujących w warstwie podszytu drzewostanów Puszczy Niepołomickiej
Dry matter content in the aboveground biomass of shrubs growing in the understorey of the Niepołomice Forest stands
Autorzy:
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/989664.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Niepolomicka
drzewostany
podszyt
krzewy lesne
biomasa nadziemna
zawartosc suchej masy
understorey
biomass component
dry matter content
niepołomice forest
Opis:
The aim of this paper was to determine the dry mass content in the fresh mass of leaves, trunks or branches and in the total woody aboveground biomass of shrubs forming the undergrowth of the stands in the Niepołomice Forest (southern Poland). The variability of the dry mass content in the analysed components was determined. For the prevailing species also its correlation with the individual's height and time at which samples were taken was investigated. The material comprised 744 samples, including 532 wood and 212 leaf samples, taken from the most common five shrub species: Corylus avellana, Frangula alnus, Padus avium, Padus serotina and Sorbus aucuparia. The shrubs were from 1 to 33 years old, and their height ranged from 0.3 to 9.9 m. It was shown that the dry mass content in leaves is significantly dependent on the shrub species, and in the case of F. alnus, P. avium and S. aucuparia on the height as well. The highest dry mass content was found in the leaves of C. avellana (39.3%), whereas the lowest – in F. alnus (25.5%). In case of F. alnus, the dry mass content depends on the time of sampling. The leaves collected in June had a significantly lower dry mass content than the ones sampled in subsequent months of the growing season. The dry mass content in the wood significantly depends on the shrub species and the analysed component, however the species−component interaction does not occur (tab. 4). The dry mass content in the trunk wood ranges from 50.3 (P. serotina and S. aucuparia) to 53.0% (P. avium) and exceeds that of the branch by from 1.0 (S. aucuparia) to 4.0% (P. avium). In the wood samples of F. alnus and S. aucuparia, taken between June and September, the dry mass content averaged at 47.3 and 48.7%, respectively, and was lower than in the samples taken between October and April, for which the respective means were 49.5 and 49.0%. In the case of F. alnus, the observed difference in the mean dry mass content is statistically significant at 0.05 level. The determined values of dry mass content in the fresh mass of individual components of the analysed shrubs can be used to find their dry mass as a basis for the calculation of the amount of accumulated carbon.
Źródło:
Sylwan; 2016, 160, 01; 21-30
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skład gatunkowy i biomasa nadziemna krzewów w podszycie drzewostanów Puszczy Niepołomickiej
Species composition and aboveground biomass of shrubs in the understory of the Niepolomice Forest
Autorzy:
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/989741.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Niepolomicka
podszyt
krzewy lesne
sklad gatunkowy
biomasa nadziemna
warunki siedliskowe
niepołomice forest
understory
shrub biomass
forest site type
Opis:
The understory, a layer composed predominantly of shrubs that perform an important phytomeliorative function, has rarely been the subject of research on the productivity and biomass. The aim of this paper was to specify the occurrence of understory aged ≥10 years as well as its species composition and the share of individual species in the biomass in the Niepołomice Forest (S Poland). The analysed features were related to the age and site conditions of the stands. The research material consisted of dry biomass of shrubs growing within circular sample plots spaced 500 m apart from each other. Dead and live (damaged and undamaged) shrubs of dbh<7 cm were cut at a ground level to determine their wet mass and samples were taken to determine the dry mass. The mass of live shrubs was calculated based on empirical formulas. 368 sample plots were set up in total. Shrubs (13 species) were observed on 76.1% of plots. Shrubs were the most common in the stands of II and IV age groups (87% of plots). No shrubs were observed on the plots with stands older than 160 years. The most common species was Frangula alnus (56.8% of the plots). Quite common ones included Sorbus aucuparia (27.7%) and Padus avium (12.8%). Cornus sanguinea, Prunus spinosa, Salix caprea and Viburnum opulus were observed on less than 1% of the sample plots. Frangula alnus and Padus avium were inventoried in as many as 8 forest site types. The largest amount of shrubs (10 species) were observed in moist broadleaved forest stands, while the fewest (2 species) in boggy mixed broadleaved and ash−alder swamp stands. Over 56% of the aboveground biomass were live shrubs of dbh <7 cm (868.6 kg/ha), almost 29% (444.1 kg/ha) were shrubs of the dbh ≥7 cm, and around 15% (227.6 kg/ha) of the biomass were dead shrubs. The total aboveground biomass of shrubs in the understory of the analysed stands equaled, on average, to 1,540 kg/ha. 94% of the biomass was the aboveground woody biomass including bark (1,448 kg/ha). The dry mass of leaves amounted to 92 kg/ha (6%). Due to high variability of the understory biomass, the estimation error of its average amount was almost 11.4% for total biomass and 13.5% for leaves.
Źródło:
Sylwan; 2015, 159, 10; 848-856
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stała krzywa wysokości dla olszy czarnej (Alnus glutinosa (L.) Gaertn.) z zachodniej części Kotliny Sandomierskiej
Generalized height-diameter model for black alder (Alnus glutinosa (L.) Gaertn.) in the western part of the Sandomierz Basin
Autorzy:
Orzeł, S.
Pogoda, P.
Ochał, W.
Powiązania:
https://bibliotekanauki.pl/articles/991312.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
drzewa lesne
olsza czarna
Alnus glutinosa
piersnice drzew
wysokosc drzew
stale krzywe wysokosci
Kotlina Sandomierska
alder stands
height−diameter curve
local uniform height curve
the sandomierz basin
Opis:
The study shows that the accuracy of tree height approximation by means of investigated functions is not modified by the age or site conditions of the analysed alder stands. The widest range of tree height variability was explained by Schnute (M5) function. Higher values of adjusted coefficient of determination (R²adj) are usually obtained when the height of black alder stands in the western part of the Sandomierz Basin is determined with M2 height−diameter curve.
Źródło:
Sylwan; 2014, 158, 11; 840-849
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alokacja nadziemnej biomasy u sosen zajmujących różne pozycje biosocjalne w drzewostanie
Aboveground biomass allocation in Scots pines of different biosocial positions in the stand
Autorzy:
Ochał, W.
Grabczyński, S.
Orzeł, S.
Wertz, B.
Socha, J.
Powiązania:
https://bibliotekanauki.pl/articles/991636.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
pozycja biosocjalna drzew
sosna zwyczajna
Pinus sylvestris
biomasa nadziemna
alokacja biomasy
scots pine
aboveground biomass
biomass allocation
biosocial class
Opis:
The aim of this study was to assess the impact of the biosocial position occupied by the tree on the amount and structure of the biomass produced. The empirical material was measurements of biomass for 63 pines (21 for each of the I, II, and III Kraft classes). The total aboveground biomass of the trees was calculated as sum of following fractions: stem wood, stem bark, living branches, dead branches, shoots, needles and cones. It has been found that with a decrease of biosocial position of tree the share of a stem increases while share of branches in the overall biomass of the tree decreases. On the other hand biosocial position does not affect significantly the share of needles, dead branches and cones.
Źródło:
Sylwan; 2013, 157, 10; 737-746
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamiczne krzywe bonitacyjne dla sosny zwyczajnej (Pinus sylvestris L.) z południowej Polski
Dynamic site index curves for Scots pine (Pinus sylvestris L.) in southern Poland
Autorzy:
Socha, J.
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/993955.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
bonitacja drzewostanow
sosna zwyczajna
Pinus sylvestris
krzywe bonitacyjne
Polska Poludniowa
site index model
base−age invariant dynamic equation
height growth
site productivity
Opis:
The aim of the study was to develop a site index model for Scots pine stands in southern Poland describing changes in height growth of stand's upper storey over time. The research material contained the height growth data obtained from an analysis of 189 tree stems. The collected material was used to develop the parameters of six dynamic growth equations which allowed to determine site productivity and predict changes in height growth of stands with age. Statistical criteria for assessing the accuracy of mapping empirical data and biological reasonableness were the basis of selection of the equation that best fits changes in height growth of the examined pine stands with age. The developed model can be used to predict the growth rate and determine the site index for Scots pine stands in southern Poland.
Źródło:
Sylwan; 2013, 157, 01; 26-38
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamiczne krzywe bonitacyjne dla drzewostanów sosnowych Puszczy Niepołomickiej
Dynamic site index curves for Scots pine stands in Niepolomice Primeval Forest
Autorzy:
Socha, J.
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/973666.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
krzywe bonitacyjne
leśnictwo
Puszcza Niepołomicka
bonitacja drzewostanów
site index model
base−age invariant
height growth
Pinus sylvestris L.
Opis:
The aim of the research was to evaluate, under the conditions of the Niepołomice Primeval Forest, the usefulness of site index models applied in forest practice in Poland and to develop a local system of site index curves for Scots pine. The research materials included measurement results for the trees growing on 74 circular, 0.05 ha sample plots. On the basis of the completed analyses, the age−related change in stand heights in the Niepołomice Primeval Forest is different than the height growth described by means of the site index models used in forest practice in Poland. As a result of several−stage analyses, a dynamic system of site index curves was developed for the Niepołomice Primeval Forest allowing calculation of the site index, as well as forecast of the height of stands at any age.
Źródło:
Sylwan; 2011, 155, 05; 301-312
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomasa sześcioletnich sosen wyrosłych z mikoryzowanych i niemikoryzowanych sadzonek
The biomass of 6-years-old pines grown from mycorrhized and non-mycorrhized seedling
Autorzy:
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/1011861.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wzrost roslin
sadzonki niemikoryzowane
wysokosc
cechy biometryczne
sadzonki mikoryzowane
sosna zwyczajna
lesnictwo
biomasa
grubosc podstawy drzewa
Pinus sylvestris
drzewa lesne
scots pine
seedling
controlled mycorrhization
biomass
empirical equations
Opis:
The research focuses on the effect of controlled mycorrhization of seedlings on growth parameters (height and diameter at the base) and biomass of Scots pine growing in two 6−year−old experimental plantations. Empirical equations were developed for the distinguished biomass fractions whose construction was based on a general formula for the allometric function.
Źródło:
Sylwan; 2009, 153, 04; 274-280
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intensywność przyrostu miąższości świerka z Beskidów Zachodnich
The rate of volume growth in the Beskid Zachodni spruce
Autorzy:
Orzeł, S.
Maruszewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1016309.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
dendrometria
Beskidy Zachodnie
wiek drzewostanu
intensywnosc przyrostu miazszosci
swierk
Picea
wysokosc nad poziomem morza
drzewostany swierkowe
przyrost miazszosci
lesnictwo
drzewa lesne
spruce
volume growth rate
position of trees above sea level
correlation coefficient
Opis:
The research material including the results of a full analysis of 171 spruce stems, selected from among 57 stands growing at altitudes of 600−1,200 m a.s.l. indicated a significant impact of the position of a stand above sea level on volume growth rate and age of its culmination. Of the three properties dbh, height and basal area growth explain the greatest range of variability of growth rate (from 75% to 91.1%). Equations developed on the basis of the above mentioned properties allow determining the values for growth rates with the mean error of 7.17−13.97%.
Źródło:
Sylwan; 2007, 151, 01; 41-50
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomasa i roczna produkcja drzewostanów dębowych Puszczy Niepołomickiej
Biomass and annual production of oak stands in the Niepolomicka Forest
Autorzy:
Orzeł, S.
Ochał, W.
Forgiel, M.
Socha, J.
Powiązania:
https://bibliotekanauki.pl/articles/1018550.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany debowe
Puszcza Niepolomicka
lesnictwo
biomasa
produkcja biomasy
oak stand
biomass
annual biomass production
Opis:
The paper presents the results of the study on biomass volume and annual production of oak stands in the Niepołomicka Forest. The analysis was based on the material collected from 59 circular sample plots where oak accounted for more than 50% of the volume of the tree layer. In the total biomass of the tree layer amounting to about 225.3 t·ha–1, the biomass of the shrub layer (underbrush) is about 2.3 t·ha–1. In the tree layer biomass (about 223 t·ha–1), wood makes up on average 86.4%, bark – 12% and assimilatory apparatus – 1.6%. The share of wood in the biomass increases with the increase of stand age, while that of bark and assimilatory apparatus declines. The proportion of these elements in the dry mass production (on average 9.8 t·ha–1·year–1) is somewhat different. Almost 35% of its volume is assimilatory apparatus whose share increases with stand age. The increment of bark is about 9%, while of wood it is 56% of the annual biomass production of the stands under analysis and slightly decreases with stand age.
Źródło:
Sylwan; 2006, 150, 05; 30-43
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nadziemna biomasa i roczna produkcja drzewostanów sosnowych Puszczy Niepołomickiej
Aboveground biomass and annual production in stands of the Niepolomicka Forest
Autorzy:
Orzeł, S.
Forgiel, M.
Ochał, W.
Socha, J.
Powiązania:
https://bibliotekanauki.pl/articles/1018720.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
Puszcza Niepolomicka
lesnictwo
biomasa
produkcja biomasy
pine stands
biomass
annual biomass production
Opis:
The empirical material used in the studies took in measurement results. The measurements were carried out on 221 circular plots distributed systematically in an area of about 5826 hectares of stands in the Niepołomicka Forest where pine accounts for more than 50% of volume in the upper tree layer. The mean biomass of these stands is about 173 t·ha–1 of which 80.6% is pine biomass. The biomass volume and increment depend equally on stand age, habitat conditions and, in some age classes, the share of admixture species. The proportion of wood in biomass production markedly declines with stand age while that of the assimilatory apparatus increased.
Źródło:
Sylwan; 2006, 150, 09; 16-32
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
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