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Wyświetlanie 1-18 z 18
Tytuł:
Szwajcarskie kontrolne powierzchnie próbne w urządzaniu lasu
Shvejjcarskie kontrolnye probnye ploshhadi v lesoustrojjstve
Schweizer Kontrollstichprobeverfahren in der Forsteinrichtung
Autorzy:
Schmid-Haas, P.
Powiązania:
https://bibliotekanauki.pl/articles/811350.pdf
Data publikacji:
1991
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Szwajcaria
urzadzanie lasu
hodowla lasu
kontrolne powierzchnie probne
pomiary
Źródło:
Sylwan; 1991, 135, 07
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar zasobów leśnych z wykorzystaniem stałych koncentrycznych powierzchni próbnych - problemy i próby rozwiązań
Measurement of forest resources using permanent concentric sample plots - problems and attempts at their solving
Autorzy:
Miścicki, S.
Nowicka, E.
Powiązania:
https://bibliotekanauki.pl/articles/1015716.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
powierzchnie probne brzegowe
powierzchnie probne koncentryczne
lasy
obliczenia
stale powierzchnie obserwacyjne
zasoby lesne
lesnictwo
permanent sample plots
concentric plots
edge plots
successive measurements
ingrowth
overgrowth
current periodic volume increment
Opis:
The conditions of using concentric sample plots in a successive inventory were researched. New definitions of ‘ingrowth' and ‘overgrowth' were introduced. As there is a possibility that sample plots could be located at stand edges, a new method POW_K of converting data from concentric plots was developed. The calculation results using this method were compared with the results obtained by the traditional method WSP. Two variants of obtaining inventory results for the whole forest district were taken into consideration – with and without stratification. Due to the value of mean errors of assessment of significant characteristics – volume and current periodic volume increment – the WSP method turned to be better – particularly in the variant with stratification. However, this method cannot be applied for utilizing the results of measurements of edge plots.
Źródło:
Sylwan; 2007, 151, 08; 15-26
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena dokladnosci inwentaryzacji drzewostanow sosnowych wykonywanej za pomoca probnych powierzchni relaskopowych
Autorzy:
Borecki, T.
Miscicki, S.
Nowakowska, J.
Stepien, E.
Wojcik, R.
Powiązania:
https://bibliotekanauki.pl/articles/819904.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
powierzchnie probne relaskopowe
zasoby drzewne
lesnictwo
inwentaryzacja lasu
dokladnosc
Źródło:
Sylwan; 1999, 143, 03; 33-41
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wiek drzewostanu sosnowego a zmiennosc sum powierzchni przekroju i miazszosci drzew na powierzchniach probnych roznych wielkosci
Autorzy:
Meixner, J.
Kazmierczak, K.
Najgrakowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/816985.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
dendrometria
powierzchnie probne male
pomiary drzewostanow
wiek drzewostanu
dokladnosc pomiaru
lesnictwo
miazszosc drzew
powierzchnia przekroju piersnicowego
Źródło:
Sylwan; 1997, 141, 02; 49-58
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność określania pierśnicowego pola przekroju drzewostanów bukowych na podstawie powierzchni próbnych
The accuracy of estimates of basal area in beech stands using sample plots
Autorzy:
Ochał, W.
Powiązania:
https://bibliotekanauki.pl/articles/1016133.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany bukowe
dendrometria
piersnicowe pole przekroju
dokladnosc pomiaru
lesnictwo
powierzchnie probne
sample plot
sampling
stand basal area
beech stand
poland
Opis:
The paper presents the results of the research on the accuracy of estimates of basal area in beech stands using sample plots. The accuracy of estimates of the analysed characteristic was evaluated on the basis of variation coefficient value of the sums of tree basal areas on sample plots. The coefficient value was empirically determined for sample plots of various size, as well as for the secondary populations differing in plot number. The research was conducted in three beech stands of age class III, IV and VI growing in the territory of the Krzeszowice Forest District.
Źródło:
Sylwan; 2007, 151, 11; 10-21
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problematyka pomiarów oraz określania miąższości martwego drewna na kołowych powierzchniach próbnych
Measurement and calculation of the volume of deadwood on circular sampling plots
Autorzy:
Bujoczek, L.
Powiązania:
https://bibliotekanauki.pl/articles/989747.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
powierzchnie probne kolowe
drewno martwe
miazszosc drewna
pomiary drewna
metody pomiarow
coarse woody debris
snags
shape
decomposition
field methods
volume determination
Opis:
The paper analyzes two methods of deadwood (DW) measurements on circular sampling plots. In the first method, the volume of DW is measured within the circumference of the sampling plot irrespective of the fact whether the live tree was located inside or outside the plot. The other method requires the measurement of only that DW, which can be attributed to trees that originally grew within the sampling plot. This requires identification all debris fragments originating from those trees both within and outside the sampling plot. Additionally, the paper compares the results obtained using Smalin's and Huber's formulas and discusses the influence of decomposition stage on the calculated volume of lying deadwood. Measurements were conducted in two stands. In each of them 20 circular sampling plots (4 or 5 ares) were established. In both stands, the second investigated measurement method led to a lower mean DW volume (by 6.3% and 27.2%). In practice, it was very difficult to identify DW from the outside of the sampling plots as high trees growing close to the plot had their fragments lying up to several dozen meters away. If a tree was very fragmented upon falling, it was difficult to find all the relevant pieces of DW and determine whether they derived from the sampling plot or not. The volume of lying DW calculated according to Smalin's formula was by 5% higher. In case of 7.7% of the 194 inventoried fragments of lying DW the transverse cross−section changed from circular to misshapen. The application of formulas accounting for decomposition decreased the calculated volume of lying DW by 5.1%. Taking into consideration the time−effectiveness and accuracy of measurements, it has been found that for most stands the best method is to measure the ends of DW pieces, calculating the length of segments from polar coordinates (using the measurement principles presented in the figures). In addition, especially in measuring large trees, one should take into account changes in shape attributable to decomposition, which may influence the calculation of DW volume. It is recommended that all DW fragments within a circular sampling plot should be measured irrespective of whether the tree from which they derive grew inside or outside the plot.
Źródło:
Sylwan; 2015, 159, 10; 795-803
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Wpływ zwiększania się wieku drzewostanu dwupiętrowego na zmienność sum powierzchni przekroju pierśnicowego i miąższości drzew na powierzchniach próbnych różnych wielkości
Effect of ageing on the variation of basal area and volume sums on sample plots varying in size in a two-storey stand
Autorzy:
Turski, M.
Andrzejewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1022959.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
suma powierzchni przekroju piersnicowego
dendrometria
suma miazszosci drzew
drzewostany dwupietrowe
wiek drzewostanu
lesnictwo
powierzchnie probne
zmiennosc
sample plot
basal area
volume
two−storey stand
pine
oak
Opis:
The paper provides an analysis of changes in coefficients of variation of basal area and merchantable volume sums on sample plots of various sizes 1, 2, 4, 10, 6, 25 and 50 ares in a two−storey stand (storey I – pine 195 years, storey II − oak 105 years) over the last decade. The authors established how many times the number of sample plots of a given size at a given age should be increased in relation to the last measurement to attain the same result accuracy. Moreover, the optimal size of small sample plots that can grant the most accurate results was calculated.
Źródło:
Sylwan; 2005, 149, 09; 15-23
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:
Struktura lasów w Polsce na podstawie danych wielkoobszarowej inwentaryzacji stanu lasu
Structure of forests in Poland based on National Forest Inventory data
Autorzy:
Jabłoński, M.
Wysocka-Fijorek, E.
Budniak, P.
Powiązania:
https://bibliotekanauki.pl/articles/987174.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Polska
lasy
struktura lasu
inwentaryzacja lasu
inwentaryzacja wielkopowierzchniowa
powierzchnie probne WISL
drzewostany
cechy taksacyjne
gatunki panujace
struktura pionowa
struktura wiekowa
forest structure indicators
forest description
nfi
Opis:
In most of European countries, basic information about forests that is used for its monitoring and formulation of national policies comes from the National Forest Inventories (NFIs). Assessment of forest resources at the national level was initiated in Poland in 2005. In 2014, the second cycle of NFI was completed. Since 2010, results of NFI are the main source of information about the amount of forest resources in Poland, their structure and condition. In the paper, we analyse the indicators of forest structure. Classification of forest categories (forested, temporary non−forested, related to forestry), vertical stand structure, species composition and age structure determined directly from NFI's sample plots were compared with descriptions of stands in which plots are located. Data from more than 29,000 NFI sample plots measured in 2010−2014 were analysed. Our results demonstrate that the share of temporary non−forested areas (resulting from manage− ment practices) assessed from NFI plots is higher than this based upon the stands description (3.9% and 1.8% respectively). We also observed that results of NFI show the huge discrepancy in percentage of land related to forestry (forest roads generally) in forests of private property comparing to cadastral data (1,2% and 0,04% respectively). Most of forests in Poland (92% based on NFI) are single−layer stands. But it should be emphasised that NFI indicate more than twice higher share of two−layer stands (4.8%) than that resulting from description of stands in which samples are located (2.2%). However, only one third of NFI plots located in two−generation and uneven−aged stands was assessed in the same way. On 80% of sample plots dominant species was in accordance with stand description. On 85% plots there were compatibility of the age of dominant species with age recorded in forest management plans. The results of our research confirm that description of the entire diversity of forests by any of the indicators is not practically possible. Simplifying the forests description occurs during NFI measurements as well as within forest management planning. However, some issues need clarification and additional analysis when NFI is used as a source of forest structure. NFI plots with maximal size of a few hundred square meters seem to be too small to observe vertical structure of stands. On the other hand, it should be recog− nized whether division of the sample plots into smaller sections does not cause overestimation of the area of temporary non−forested land.
Źródło:
Sylwan; 2017, 161, 04; 267-276
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność określenia zasobności na poziomie warstw gatunkowo-wiekowych w obrębowej metodzie inwentaryzacji
Accuracy of volume determination on the level of age-species layers in the stratified sampling method
Autorzy:
Banaś, J.
Drozd, M.
Bujoczek, L.
Zięba, S.
Zygmunt, R.
Powiązania:
https://bibliotekanauki.pl/articles/986687.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
powierzchnie probne
forest inventory
stratification
standard error
sample plot
variability coefficient
lesnictwo
drzewostany swierkowe
warstwy gatunkowo-wiekowe
inwentaryzacja lasu
zasobnosc drzewostanu
miazszosc drzewostanow
metoda obrebowa
dokladnosc pomiaru
Opis:
Statistical representative method of inventory based on stratified sampling is used for elaborate forest management plans in Poland. Strata are created according to the dominant tree species and age of stands. First stratum include stands with age from 21 to 30 years and the interval in the next strata is 10 years. Sample plot size depends on stand age and varies from 0.005 to 0.05 ha. According to the allocation pattern number of samples is proportional to age and total area of stands in a stratum. Diversification of number and size of sample plots has a profound influence of inventory precision in an age classes. The aim of the study is to analyse the accuracy of the stand volume determination on the level of age−species strata. Research was conducted based on the data obtained from periodic forest inventory in seven mountainous forest subdistricts located in the Kłodzko Basin (SW Poland). Norway spruce stands with total area of 39,935.45 ha and 6102 sample plots were chosen for analysis. Sampling fraction, mean number and volume of trees on a sample plot, coefficient of volume variability and standard error of volume were calculated for each stratum in analyzed forest subdistricts. Sample plots with size of 0.005 ha established in young stands (21−30 years) are characterized by small number of trees (4.3−7.6 in average) and the highest coefficient of volume variability (93%). Additionally, because of low age of stands, the number of plots is also small (18 on average), which influences the low precision of volume inventory in this stratum. Standard error of volume was on the mean level of 23% in the youngest age stratum and decreased with age of stands to 5% in the stands of 41−71 years and below this level in the strata with the older stands. Increasing the plot size in the youngest stratum will be effective way to improve accuracy of forest inventory in the method based on stratified sampling.
Źródło:
Sylwan; 2017, 161, 09; 715-722
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:
Przemiana sposobu zagospodarowania lasu na przerębowy na przykładzie jednostki kontrolnej Chełmsko w Nadleśnictwie Kamienna Góra
Conversion to selection type of silvicultural system on the example of Chelmsko control unit in the Kamienna Gora Forest District
Autorzy:
Barzdajn, W.
Kowalkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/989578.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Sudety
jodla pospolita
restytucja gatunku
drzewostany swierkowe
przebudowa drzewostanow
ciecia przerebowe
powierzchnie probne
zmiany skladu gatunkowego
zmiany struktury drzewostanu
Nadlesnictwo Kamienna Gora
abies alba
selection silvicultural system
the sudety mts.
Opis:
The study assesses the effect of applied cuttings on the transformation of the species composition, structure and development of the forest towards selection forest type. The described control unit was established in 2000 in the Krucze Mts. (southern Poland) within the programme of silver fir restoration in the Sudety Mts. The working hypothesis was based on the advantageous effect of the selection management system on fir trees. 46 permanent circular sample plots of 0.05 ha each were established and diameter at breast height measured on all trees along with height of 2−3 trees growing closest to the plot center. Measurements were repeated in 2004 and 2013. The greatest share in the growth increment was recorded for the most numerous species (spruce and fir). Only spruce and beech were important in the group of young trees (recruitment), which did not include fir or larch. The timber resources increased from 339 in 2000 to 381 m³/ha in 2013, which indicates that not whole current increment was harvested. The increase in the growing stock follows the reduction in the number of trees per hectare from 361 to 317. Thus the number of young trees did not compensate for the losses. As a result the investigated unit is not in the state of equilibrium and in the future more work and care should be devoted to the regeneration. Fir turned out to be a species with the greatest production potential. In the first period growing stock of this species amounted to 17%, while the increment was over 26%. In the latter the increment reached 34%. The most important objective of the selection cuttings in this concrete unit should be to tend for regeneration and trees at low diameter sub−classes at the expense of use of trees with target values of diameters at breast height and disturbing the selection cutting structure. It is advisable to increase the share of fir in the structure of analysed unit.
Źródło:
Sylwan; 2016, 160, 05; 388-396
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statystyczna ocena zgodnosci szacunkow defoliacji drzew probnych na stalych powierzchniach obserwacyjnych monitoringu lasu
Autorzy:
Wawrzoniak, J
Pluciak, M.
Malachowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/53399.pdf
Data publikacji:
1999
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
defoliacja
drzewa probne
lasy
szacowanie
stale powierzchnie obserwacyjne
monitoring
lesnictwo
statystyczna ocena zgodnosci
Źródło:
Prace Instytutu Badawczego Leśnictwa. Seria A; 1999, 866-872; 19-38
0369-9870
Pojawia się w:
Prace Instytutu Badawczego Leśnictwa. Seria A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Panstwowy Monitoring Ptakow Drapieznych - metoda oceny liczebnosci i rozpowszechnienia na rozleglych powierzchniach probnych
National Monitoring of Birds of Prey - evaluation methodology of the population and distribution in large sample areas
Autorzy:
Cenian, Z
Powiązania:
https://bibliotekanauki.pl/articles/882416.pdf
Data publikacji:
2009
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
Tematy:
panstwowy monitoring srodowiska
Monitoring Ptakow Drapieznych
ptaki drapiezne
kania ruda
Milvus milvus
bielik
Haliaeetus albicilla
kania czarna
Milvus migrans
bocian czarny
Ciconia nigra
orlik krzykliwy
Aquila pomarina
kobuz
Falco subbuteo
pustulka
Falco tinnunculus
trzmielojad
Pernis apivorus
blotniak lakowy
Circus pygargus
jastrzab
Accipiter gentilis
blotniak stawowy
Circus aeruginosus
myszolow
Buteo buteo
liczebnosc
wystepowanie
powierzchnie probne
Opis:
Monitoring Ptaków Drapieżnych (MPD) jest jednym z 11 ornitologicznych zagadnień realizowanych w ramach Państwowego Monitoringu Środowiska na zlecenie Głównego Inspektoratu Ochrony Środowiska. Głównym zadaniem MPD jest śledzenie trendów wskaźników liczebności i rozpowszechnienia trzmielojada Pernis apivorus, kani czarnej Milvus migrans, kani ruda Milvus milvus, bielika Haliaeetus albicilla, błotniaka stawowego Circus aeruginosus, błotniaka łąkowego Circus pygargus, jastrzębia Accipiter gentilis, myszołowa Buteo buteo, orlika krzykliwego Aquila pomarina, pustułki Falco tinnunculus, kobuza Falco subbuteo i bociana czarnego Ciconia nigra. Zaproponowana metodyka jest próbą połączenia względnie precyzyjnych ocen liczebności z uproszczoną, standaryzowaną techniką gromadzenia danych. Uzyskane wyniki ilościowe należy traktować jako wartości indeksowe. W przypadku poszczególnych gatunków w różnym stopniu odbiegają one od rzeczywistych wartości bezwzględnych, jakie uzyskalibyśmy metodami szczegółowymi. Wyniki ekstrapolacji danych indeksowych na powierzchnię całego kraju są w przypadku większości gatunków zbieżne z dotychczasowymi oszacowaniami liczebności i rozpowszechnienia. Dowodzi to, że opracowana na potrzeby MPD metodyka może być stosowana w ocenach bezwzględnej liczebności i rozpowszechnienia wybranych gatunków ptaków drapieżnych na rozległych powierzchniach badawczych.
Monitoring of Birds of Prey (MPD) is one of 11 ornithological issues implemented under the National Environmental Monitoring at the request of the Chief Inspectorate for Environmental Protection. The main task of the MPD is to track trends of population and distribution indicators of honey buzzard Pernis apivorus, black kite Milvus migrans, red kite Milvus milvus, white-tailed eagle Haliaeetus albicilla, marsh harrier Circus aeruginosus, meadow harrier Circus pygargus, goshawk Accipiter gentilis, buzzard Buteo buteo, lesser spotted eagle Aquila pomarina , kestrels Falco tinnunculus, hobby Falco subbuteo and black stork Ciconia nigra. The proposed methodology is an attempt to combine relatively accurate assessments of the population with a simplified, standardized technique for collecting data. Quantitative results obtained should be treated as index values. In the case of different species in varying degrees they diverge from the actual absolute values, which would be obtained with specific methods. Results of extrapolation of index data for the territory of the whole country are in the majority of species consistent with existing estimates of bird abundance and distribution. This proves that the developed methodology for the MPD can be used in the evaluation of absolute abundance and distribution of selected species of birds of prey in vast areas of research.
Źródło:
Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2009, 11, 3[22]; 10-21
1509-1414
Pojawia się w:
Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
Dostawca treści:
Biblioteka Nauki
Artykuł
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