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Tytuł:
Экологические характеристики возрастных рядов культуры и насаждений естественного происхождения сосняков мшистых в заказнике «Гродненская Пуща»
Ecological characteristics of the age series of culture and natural origin plantations of mossy pine forests in the reserve “Grodnenskaya Pushcha”
Autorzy:
Ивановна Садковская, Анна
Викторович Созинов, Олег
Powiązania:
https://bibliotekanauki.pl/chapters/31342664.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
age range of tree-stands
environmental factors
Grodno Forest
mossy pine forest
ordination
Pinetum pleuroziosum
reserve
Opis:
The studies were carried out in 2019 on the territory of the landscape reserve Grodnenskaya Pushcha (Grodno region, Belarus) in which 26 natural and artificial communities of pine forests with mosses (Pinetum pleuroziosum) were studied on a age range from 5 to 113 years, using the trial plot method (400 m 2). Phytoindication of ecological regimes on the scales proposed by H. Ellenberg showed a tendency to decrease illumination, moisture, and trophy and an increase in acidity in the age range of pine forests with mosses. The ecological interpretation of the components (the Principal Component Analysis) of the studied pine forest communities showed that the main factors responsible for the formation of the time series of natural and artificial pine forests with mosses are forestry activities, illumination regime, and soil trophy.
Źródło:
Lasy przyszłości. Wyzwania współczesnego leśnictwa; 89-99
9788367185462
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nietoperze w Puszczy Niepołomickiej
Bats in Niepolomicka Forest
Autorzy:
Wojciuch-Płoskonka, M.
Powiązania:
https://bibliotekanauki.pl/articles/985679.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lasy
fauna
nietoperze
Chiroptera
sklad gatunkowy
Puszcza Niepolomicka
bats
forest types
age class
echolocation
Opis:
The objective of the study was to recognise the species composition of bats in two forest stands that differ in terms of habitat type and age class. The study was carried out in the Niepołomicka Forest (southern Poland). An ultrasound ‘time−expansion’ processing system with Pettersson D240× detector was used to identify bat species by their echolocation signals employing SonoBat v.2.9.7 software to analyse bioacoustic spectrograms. We set up 36 recording points located in: old−growth and young plantations within the hygric mixed coniferous forest type (Pino−Quercetum) and hygric deciduous forest type (Tilio−Carpinetum). The measurements were carried out in July 2013, from 8:30 PM to 0.00 AM. The occurrence of nine species of bats were documented (tab.) of which Pipistrellus pygmaeus, P. pipistrellus, Barbastella barbastellus, Myotis myotis, M. emarginatus, and M. daubentonii had not been previously recorded in the Niepołomicka Forest. P. pipistrellus, M. emarginatus, M. daubentonii, and E. serotinus were recorded only in old−growths, whereas Nyctalus leisleri, N. noctula, and P. pygmaeus were found within both habitat types. Only two of the species identified in the study (M. myotis, and B. barbastellus) occurred both in the plantations and old−growth of hygric deciduous forest as well as in hygric mixed coniferous forest. None of the detected species was recorded exclusively in old−growth of hygric mixed coniferous forest type. The occurrence of a given bat species in the studied forest habitats and age classes of forest stands can be associated with the availability of prey, divergent feeding strategies, and with the adaptations affecting the nature of flight and ways of locating prey. The obtained results widened the knowledge of the species composition of bat fauna in the Niepołomicka Forest. At least 13 bat species live here. Apart from the nine species found in this study, four other species were found there in past years (Plecotus auritus, M. bechsteinii, M. brandtii and M. mystacinus).
Źródło:
Sylwan; 2019, 163, 04; 348-352
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozpad drzewostanów świerkowych w Beskidzie Żywieckim
Dieback of Norway spruce stands in the Beskid Zywiecki Mts.
Autorzy:
Dmyterko, E.
Bruchwald, A.
Mionskowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/979601.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Beskid Zywiecki
drzewostany swierkowe
rozpad drzewostanow
swierk pospolity
Picea abies
struktura drzewostanu
struktura wiekowa
struktura gatunkowa
pozyskiwanie drewna
struktura pozyskania
zagrozenia lasu
wiatry
szkody od wiatru
forest dieback
picea abies
species structure
age structure
timber harvest
threat to forests by wind
Opis:
In the Beskid Żywiecki, the combination of abiotic, biotic and anthropogenic factors unfavourable for the growth of trees led to the dieback of spruce stands. The intensification of this process began after the hurricane in November 2004, followed by years of negative climatic water balance. The deterioration of tree growth conditions occurred after the drought in July 2006 and damage caused by the Kyril hurricane in January 2007. The weakened spruces were attacked by the bark beetles, the outbreak of which caused a massive dieback of spruce stands. In order to assess the volume of harvested timber in years 2004−2016, the volume of allowable cut (model volume) was calculated from the stand growth model for each forest district of Beskid Żywiecki. The comparison of the volume of harvested timber with the model volume allowed to determine the rate of dieback of spruce stands. The volume of harvested timber in 2007−2009 exceeded the model volume even 2.5 times. The cuts included mainly deadwood, wind−broken and wind−fallen trees, while the harvest of live trees was scarce. In the period 2010−2013, the harvested volume of live trees accounted for 50−70% of the model volume, the volume of deadwood in the same period was ca. 100% and additionally the volume of blown−down timber after the hurricane was 20−40% of the model volume, which taken together accounted approximately to 200% of the model volume. The execution of such harvesting operations, including silvicultural tasks, did not allow to carry out optimal forest management. The period 2010−2013 saw a downward trend. It was disrupted by the hurricane in December 2013, after which the volume of harvested timber, consisting mainly of wind−broken and wind−fallen trees, increased to 280% of the model volume. Again, the high volume of harvested timber was noted in 2016, (ca. 220% of the model volume). The process of damage to spruce stands in Beskid Żywiecki is likely to continue. A decline in its intensity may occur in the absence of old stands, which to a large extent already takes place in the forests of the Węgierska Górka Forest District. Currently, the most threatened by wind are forests in Ujsoły, Jeleśnia and Nowy Targ forest districts. The least threatened are forests in the Węgierska Górka. This forest district and in the future the remaining forest districts of Beskid Żywiecki, will face enormous challenges to obtain high yield and appropriate species composition.
Źródło:
Sylwan; 2019, 163, 02; 130-140
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika i główne kierunki zmian w drzewostanach zagospodarowanej części Puszczy Białowieskiej
Dynamics and main direction of change in forest stands constituting the managed part of Bialowieza Forest
Autorzy:
Bruchwald, A.
Dmyterko, E.
Brzeziecki, B.
Powiązania:
https://bibliotekanauki.pl/articles/985942.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Bialowieska
drzewostany gospodarcze
dynamika drzewostanu
siedliska lesne
struktura drzewostanu
sklad gatunkowy
struktura wiekowa
miazszosc drzewostanow
przyrost miazszosci
abiotic and biotic threats
forest age structure
low−productivity stands
stand productivity
stand volume
stand stability
species composition
wind risk model
Opis:
The paper describes current (in years 2007−2017) changes of basic parameters of forest stands that constitute the managed part of Białowieża Forest (ca. 53,000 ha), divided into three forest districts: Białowieża (12,600 ha), Hajnówka (19,700 ha) and Browsk (20,400 ha). The investigated tree stands represent different phases of ecological succession, modified by silvicultural treatments and other human activities. The course of the succession processes is varied, depending, first of all, on local site conditions, consisting mainly of fresh sites (ca. 60%) – particularly fresh broadleaved forest, and encompassing exceptionally high fraction of wet and swamp sites (40%) – especially wet broadleaved forest site type. Most stands represent the intermediate, highly productive phase of succession, with spruce and oak as the dominant tree species. In particular, such stands are common in Białowieża and Hajnówka forest districts. Recently, the share of the mentioned stands is declining, most intensely in the Browsk Forest District. In 2017 alone, 430 ha of highly productive forest stands disappeared from the Białowieża Forest. The process of decay involved mixed stands; besides of spruces which were killed by a current bark beetle infestation, also many oaks, pines, birches, alders as well as rare and valuable minor tree species (such as ashes and maples) died. Dying spruce and, more often, oak stands are often replaced by low−productive hornbeam trees, occupying earlier lower stand strata in such stands. The resulting hornbeam stands are often distinguished by low crown closure and low productivity. Tree stands occurring in the Białowieża Forest are among the most endangered by wind damage stands in Poland. It means that in case of strong winds, several trees will be broken and/or uprooted. The intensity of such phenomena will be further increased by the high tree volume of stands as well as by the presence of many gaps in forest canopy, caused by a massive mortality of spruce trees. In general, one may expect that in the nearest future many stands occurring in the Białowieża Forest, built by different tree species, will be subject to a massive decay. The list of factors contributing to this process is long and involves, among other things, recurring droughts during the growing season, unfavorable changes in ground water table and increased frequency of strong winds. All these factors negatively influence the health status of trees, which further favours the development of parasitic fungi and insects. In consequence, there is a high probability that many areas in the Białowieża Forest will, for a long time, retain a treeless character and/or will be occupied by low−productive and single species hornbeam stands.
Źródło:
Sylwan; 2018, 162, 11; 897-906
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement and evaluation of timber yields and corresponding non-timber forest products of selected tree species. An exploratory study on poplar, Acacia, Ulmus and Juglans tree species in Kyrgyzstan
Autorzy:
Agbenowu, Y.I.S.
Attah, R.
Powiązania:
https://bibliotekanauki.pl/articles/2049706.pdf
Data publikacji:
2018
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
forest zone
Kirgizstan
timber yield
wood measurement
evaluation
poplar
Acacia
Ulmus
Juglans
biomass
volume
net present value
growth yield
rotation age
Opis:
With issues of high timber demand and illegal logging in the forest zones of Kyrgyzstan, agroforestry may serve as a viable option for rectification. Yields of timber and expected income from the most popular tree species are in most cases lacking. The goal of this study is to evaluate the timber yields and non-timber forest product from Ulmus, Poplar, Acacia and Juglans tree species in Kyrgyzstan. More focus was allocated to Poplar as this is one of the most common and preferred tree species in Kyrgyzstan. A sample size of 420 trees was recorded from 18 stands with 20 trees measured in each stand with the exception of Juglans which were 6 stands with 9-17 trees each The study estimated (i) tree volume using allometric parameters (ii) age-biomass relationship (iii) Factual Branch Analysis model to estimate the above ground biomass of the different tree segments (iii) revenue deduction and NPV of Poplar trees and (iv) biological rotation Age to determine the suitable age for Poplar harvesting. The findings show that NPV is highest at 10 years for Poplar when it is being considered for fast-growing timber. The biological rotation age was, however, higher at around 17 years. Site-specific age-biomass model appears to be suitable for estimating tree biomass since the tree allometry was found to differ significantly between studied stands even with similar age ranges. The developed relationship and tree database can adequately be applied to estimate tree volume and biomass in similar site conditions in the studied region.
Źródło:
Environment, Earth and Ecology; 2018, 2, 1; 12-27
2543-9774
2451-4225
Pojawia się w:
Environment, Earth and Ecology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie metody litologicznej do weryfikacji rezultatów nieinwazyjnych badań kurhanów z epoki brązu na pograniczu śląsko-wielkopolskim (Las Krotoszyn, Wielkopolska)
Use of the lithological method in verifying results of non-invasive surveys of the Bronze Age barrow mounds on the Silesia and Wielkopolska borderland (Krotoszyn Forest, Wielkopolska)
Autorzy:
Hildebrandt-Radke, Iwona
Mateusz, Stróżyk
Czebreszuk, Janusz
Jaeger, Mateusz
Pospieszny, Łukasz
Cwaliński, Mateusz
Niebieszczański, Jakub
Rotnicka, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/578286.pdf
Data publikacji:
2018
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
kurhany
lotniczy skaning laserowy (ALS)
prospekcja magnetometryczna
metoda litologiczna
epoka brązu
Las Krotoszyn
barrow mounds
Airborne Laser Scanning (ALS)
magnetometry prospection
lithological methods
Bronze Age
Krotoszyn Forest
Opis:
Upowszechnienie się w archeologii metod nieinwazyjnych umożliwiło w znacznie większej skali badania obszarów leśnych. W badaniach cmentarzysk kurhanowych położonych na Wale Krotoszyńskim (Las Krotoszyn), w celu rozpoznania morfometrycznego cmentarzyska kurhanowego i identyfikacji kopców, które weryfikowano dodatkowo w terenie, zastosowano metody lotniczego skaningu laserowego do wykonania numerycznego modelu terenu. Wykonanie prospekcji magnetometrycznej, na podstawie oceny zróżnicowania anomalii magnetycznych, dało możliwość uchwycenia złożonej struktury wewnętrznej badanych kurhanów. Wyniki magnetometrii weryfikowane były poprzez odwierty geologiczne w miejscach występowania anomalii magnetycznych w obrębie kurhanu, a pobrany z nich materiał poddano badaniom litologicznym oraz analizie podatności magnetycznej.
The spread of non-invasive methods in archaeology made it possible to study forest areas. In the study of barrow cemeteries located on the Krotoszyn Ridge (Krotoszyn Forest), aerial laser scanning methods were used to implement a numerical terrain model for morphometric recognition and identification of burial mounds, which were additionally verified in the field. Magnetometric prospection made it possible to study the complex internal structure of the studied mounds on the basis of the diversity of magnetic anomalies. The verification of the geomagnetic surveys was based on geological drillings in the places with the largest magnetic anomalies within the burial mounds; the material collected from them was subjected to lithological tests and analysis of magnetic susceptibility.
Źródło:
Acta Geographica Lodziensia; 2018, 107; 73-92
0065-1249
Pojawia się w:
Acta Geographica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic site index model and trends in changes of site productivity for Alnus glutinosa (L.) Gaertn. in southern Poland
Autorzy:
Socha, Jarosław
Ochał, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/956987.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
height growth model
height-age relationship
forest site
evaluating site productivity
alder
Opis:
Black alder is naturally widespread across all of Europe and has an increasing importance for forest ecosystems. Thanks to the considerable tolerance to adverse climatic and edaphic environmental conditions black alder is important both in open landscapes and can also be involved in the rehabilitation of disturbed soils. Assessment of site productivity is essential for providing a frame of reference for silvicultural diagnosis and prescription in order to ensure the sustainability of existing and newly established ecosystems. The most accepted method of evaluating site productivity is the site index (SI). The aim of the presented research was to develop the SI model for black alder in southern Poland. The developed SI model was used as a tool in order to test the research hypothesis assuming the increase in site productivity for black alder in southern Poland. The research material for development of SI model were stem analysis data from 180 research plots. Both, the local model parameter, which was estimated individually for every tree, and the other parameters estimated globally for the whole data set were estimated simultaneously. Changes in site productivity were analyzed on research plots and a set of 12,974 stands from the forest inventory database. Site indices calculated using the developed model are negatively correlated with age/ positively correlated with establishment year of the stands. This confirms the existence of the phenomenon of increasing site productivity for black alder. During the last century site productivity measured with site index increased on average 5 m. Therefore, black alder that belongs to the fast-growing tree species should be considered of the increasing importance for forest management.
Źródło:
Dendrobiology; 2017, 77; 45-57
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the relations between burial types and a level of development of the society
Autorzy:
Grechko, Denis S.
Powiązania:
https://bibliotekanauki.pl/articles/567516.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
East European Forest-Steppe
Bronze Age
Scythian period
funeral ceremony
human burials
exposure
Opis:
There are main forms of the funeral ceremony of indigenous population of Central and East European Forest-Steppe of the Bronze Age and the Scythian period which have been marked out in the article. The ways of treating the dead were different. The body could be buried in the ground and burial mounds within the territory of settlements (in household buildings and special graves). The bones of dead could be left in the settlement area on exposure. The forest-steppe population followed a tradition of forefathers which was expressed in worship of human remains.
Źródło:
Materiały i Sprawozdania Rzeszowskiego Ośrodka Archeologicznego; 2017, 38; 101-109
0137-5725
Pojawia się w:
Materiały i Sprawozdania Rzeszowskiego Ośrodka Archeologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The formation and structure of clones of forest herbs in ecosystem of north-eastern Ukraine
Autorzy:
Kovalenko, I. M.
Powiązania:
https://bibliotekanauki.pl/articles/100506.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
forest herbs
population
clone
partial bush
age state
zioło leśne
populacja
kopia
Opis:
The clonal structure of forest herbs of north-eastern Ukraine, such as Aegopodium podagraria L., Asarum europaeum L., Carex pilosa Scop., Stellaria holostea L., has been examined using the total mapping method. The regularities of changes within the radii of clones, density of partial bushes and their age have been found out. The author has suggested an original statistical and graphical method which allows to estimate age state of each clone and make its land zoning.
Źródło:
Geomatics, Landmanagement and Landscape; 2016, 2; 61-76
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wartość rekreacyjnej funkcji lasu w świetle wyników ogólnopolskiego badania opinii społecznej
Value of leisure-related function of forest in view of the results of nationwide survey in Poland
Autorzy:
Skłodowski, J.
Gołos, P.
Powiązania:
https://bibliotekanauki.pl/articles/989348.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy
funkcje lasu
funkcje rekreacyjne
wartosc rekreacyjna
hipotetyczna gotowosc finansowania
opinia spoleczna
badania ankietowe
ce method
wtp
education
age
respondents' financial situation
forest management for tourist purposes
Opis:
Driven by social and economic changes, which have taken place for the last 30 years, the European forest management objectives have been redefined. By the action of public opinion, forest management, increasingly frequently and in a broader range, focuses on public benefits from forests. One of the most important functions is the possibility of leisure and recreation in the forest. The purpose of the research was the analysis of the hypothetical readiness to finance the leisure−related function of forest based on WTP (Willingness To Pay) amount. A question, which enabled the assessment of a social value of leisure−related function of forest, was asked to a random−quota sample of 1000 people over 18 years of age during the nationwide survey carried out in 2013 by TNS Polska. Out of 1000 respondents, the WTP>0 was declared by 29% respondents. Surveyed persons indicating forest with poorer infrastructure declared higher values calculated per household (PLN 13.59 ±0.84) than respondents who selected a better managed forest (PLN 12.86 ±0.88, PLN 12.91 ±1.46). The average WTP amount per person for respondents with the university degree (bachelor and master degree) was PLN 6.23 ±0.48, whereas for respondents with lower education, it was on the level of PLN 5.26 ±0.25. The average WTP also depended on the age of respondents. It was PLN 11.42 ±1.43 for 20−year−olds per family, whereas for 40−year−olds it was PLN 14.16 ±1.05. The average WTP per person increased along with the age of respondents; from PLN 4.37 ±0,42 (20−year−olds) to PLN 6.00 ±1.11 (80−year−olds). Disregarding the top WTP value per household of respondents in the worst financial situation (20.00 ±10.00), the average WTP value per household increased from PLN 10.26 ±1.69 (in poor financial situation) to PLN 14.55 ±2.97 (very well−off).
Źródło:
Sylwan; 2016, 160, 09; 759-766
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deforestation and its impacts on climate change an overview of Pakistan
Autorzy:
Ali, A.
Riaz, S.
Iqbal, S.
Powiązania:
https://bibliotekanauki.pl/articles/11968.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
climate change
deforestation
Pakistan
catastrophic event
forest age
natural factor
weather
industrialization
urbanization
global temperature
surface temperature
disaster
South Asia
Opis:
Forests are one the main natural factors that regulate and determine climate, weather patterns and amount of CO2 of an area. With rapid industrialization and rapid urbanization there is a significant increase in deforestation and as a consequence rise in global mean surface temperatures. Rapid and unchecked cut down of forest cover has resulted in some of the worst disasters during the last decades. This paper focuses on studying the role of deforestation, its influence on climate change phenomena and its consequences in Pakistan.
Źródło:
Papers on Global Change; 2014, 21
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena metod i zasad gospodarowania w Lasach Państwowych w minionym dwudziestoleciu
Evaluation of the methods and principles of forest management in the State Forests in the past two decades
Autorzy:
Poznański, R.
Powiązania:
https://bibliotekanauki.pl/articles/991592.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Panstwowe Gospodarstwo Lesne Lasy Panstwowe
gospodarka lesna
gospodarka zrownowazona
lasy gospodarcze
lasy ochronne
uzytkowanie rebne
uzytkowanie przedrebne
wiek rebnosci
regulacja uzytkowania rebnego
rotation age
allowable cut
cut determination by silvicultural needs
forest management planning
location of cutting sites
ecological forest management
Opis:
The adopted rotation age and prescribed cut are found not to be fully respected at any stage of regulation, planning and implementation of cutting plans. As a result, timber, the main crop in forestry, is not uniform in terms of rotation age and fails the adopted criteria of crop maturity. Protective forests are not subject to management unless cut determination derives from silvicultural needs, without specifying the criteria for these needs. The level of cuts subjectively determined by quality control inspectors is not respected in forest management practice and should be recommended for use in the forests administered by the State Forests.
Źródło:
Sylwan; 2013, 157, 04; 298-305
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzrost różnorodności gatunkowej chrobotków jako efekt rębni zupełnej na ubogich siedliskach borowych
Increase of Cladonia species diversity as a consequence of clear-cutting in nutrient-poor forest sites
Autorzy:
Stefańska-Krzaczek, E.
Faltynowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/994072.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
siedliska borowe
siedliska oligotroficzne
rebnie zupelne
drzewostany sosnowe
chrobotek
Cladonia
wystepowanie
roznorodnosc gatunkowa
scots pine forest
managed forest
ground lichens
stand age classes
Opis:
Clear−cutting impacts site conditions seriously. However, in nutrient−poor sites the effects of stand removal can be minor than in nutrient−rich sites. The aim of this work was to assess whether the clear−cut can improve species diversity of ground Cladonia species, which decline has been observed in forest communities. In stands of different age classes (≤10, 11−20, 21−40, 41−60, 61−80, ≥81 years) in the Przymuszewo Forest District (northern Poland) ground Cladonia species and their cover were recorded on research plots (10×15 m). A total of 24 species were identified in the study area. There were more Cladonia species and they were more abundant in young stands (<20 years old) than in stands older than 60 years. Nine species are significantly more frequent and demonstrated high fidelity in young stands and only one was characteristic for old stands. Composition of Cladonia species depended primarily on stand age and subsequently on canopy or bryophyte cover. In nutrient−poor sites clear−cutting is favourable for Cladonia species diversity.
Źródło:
Sylwan; 2013, 157, 12; 929-936
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekonomiczny wiek rębności drzewostanów sosnowych
Economic rotation age of Scots pine stands
Autorzy:
Piekutin, J.
Skręta, M.
Powiązania:
https://bibliotekanauki.pl/articles/1008788.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
gospodarka lesna
drzewostany sosnowe
wiek rebnosci
ekonomiczny wiek rebnosci
economic rotation age
value of forest stand
Opis:
The determination of the best rotation age for trees and forest stands is one of the most decisive problems in forestry. It results from different aims of forest management. There are many criteria of selecting the product of forest utilization and deciding about stand maturity. They can be divided into biological, technical and economical ones. The most common are usually based on the rules of forest management. Different rotation age for the stand, dependent on various factors, always influences economical balance between bore costs and achieved income. Article presents the method of defining the economical rotation age based on the maximization of the income.
Źródło:
Sylwan; 2012, 156, 10; 741-749
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Smukłość modrzewia europejskiego (Larix decidua Mill.) i jej związki z innymi cechami biometrycznymi
Slenderness of European larch (Larix decidua Mill.) and its relationships to other biometric parameters
Autorzy:
Kaźmierczak, K.
Nawrot, M.
Pazdrowski, W.
Jędraszak, A.
Najgrakowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/994964.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
drzewa lesne
siedliska lesne
modrzew europejski
Larix decidua
smuklosc drzew
wiek drzew
piersnice drzew
wysokosc drzew
powierzchnia rzutu korony
srednica korony
dlugosc korony
korelacja cech
larch
slenderness
age
forest habitat type
tree growth area
crown projection area
Opis:
The study presents the relationships between larch slenderness and age, breast height diameter, height, crown width, crown projection area, crown length and habitat type. The study comprised larch trees in a dominant stand of different age classes growing in fresh mixed coniferous (BMśw), fresh mixed deciduous (LMśw) and fresh deciduous (Lśw) forest habitats. The slenderness of each larch was calculated as the ratio of tree height to breast height diameter. The crown projection area was calculated as a circle with a radius equal to the average radius of the crown. The average crown radius was established after its projection in the four main geographical directions. The crown length was calculated as the difference between the height of a tree and the height of crown location. Also an attempt was made to describe tree slenderness using multiple regression equations.
Źródło:
Sylwan; 2012, 156, 02; 83-88
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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