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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:
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:
Wpływ wieku drzewostanu na dostępność pokarmu danieli
Autorzy:
Borkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1178263.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
dostepnosc pokarmu
daniel
zwierzeta lowne
lowiectwo
drzewostany
wiek drzewostanu
lesnictwo
fallow deer
forest age
food availability
Opis:
Influence of forest age on fallow deer food availability was studied in two localities in Poland. There were some differences between them, but in both cases pole−sized and mature stands were more abundant in food than the younger age classes. Fallow deer food availability was lowest in mature beech stands. Comparisons with other studies on this issue made in Poland showed that results are different depending on deer species considered. It comes from different food eaten by every species and abundance of various plants in forest age classes may follow different patterns. Besides, this study has shown that it is very hard to find general pattern of relation between forest age and deer food abundance for various regions, because this will depend on tree species dominating in the forest as well as forest management practices.
Źródło:
Sylwan; 2003, 147, 01; 88-95
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:
Dendrochronological studies of Juniperus communis dying out population in the "Jalowce" reserve (Pomerania)
Autorzy:
Cedro, A
Wrobel, M.
Jurzyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/41065.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
dendrochronology
juniper
Juniperus communis
population
meteorological condition
tree ring width
Jalowce reserve
Pomeranian region
Polska
forest nature reserve
plant age
tree
Opis:
The aim of undertaken research was recognition the reasons of dying out the common juniper Juniperus communis L. ssp. communis population in the forest nature reserve “Jałowce” (Pomerania). Applied methods of dendrochronological analysis let to determine the age of juniper-stand in the reserve and describe the influence of climatic conditions on its growth. Obtained results testify to Juniperus communis chronology with signature WIE collected from 17 individual sequences which numbered 102 tree ring width and represented a time span 1903 to 2004. Such results described the juniper-stand in the reserve as ageing population with the oldest specimen at age 98 years. However, the last several years were characterised by the lack of strong growth depressions typical for earlier time periods with tree ring width ranged 0.7–1.0 mm (themean annual tree ring width amounted to 0.85 mm), but the visible symptoms of degeneration and dying out of protected common juniper population intensified probably because of its age.
Źródło:
Dendrobiology; 2007, 58; 17-23
1641-1307
Pojawia się w:
Dendrobiology
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:
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:
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:
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
Tytuł:
The state of bioelements in the hair of free-ranging European bisons from Białowieża Primeval Forest
Autorzy:
Kosla, T.
Skibniewska, E.
Skibniewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/30717.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bialowieza Forest
Polska
European bison
bioelement content
bison
hair
animal age
age
gender
animal hair
animal organism
hair sample
phosphorus content
magnesium content
titanium content
vanadium content
Opis:
Human or animal hair is considered to be a good indicator of the content of bioelements or toxic elements in human and animal organism. Its analysis is a good alternative for the arduous obtaining blood or biopsy samples. The aim of the performed research was the assessment of some chosen bioelements in the organism of European bison on the basis of their analysis in hair. The investigation material comprised hair samples obtained from 22 animals. All animals were divided into groups according to gender (males, females) and age (calves up to one year of age and animals older than 2 years). Samples were mineralized in nitric acid, under pressure in the microwave apparatus. The content of phosphorus, sulphur, magnesium, iron, titanium and vanadium were determined in hair samples. The content of these elements was determined using the ICP-AES method in accredited laboratory. The accuracy of determinations was tested using the standard reference material. The mean content of phosphorus in hair amounted to 245.14 mg · kg–1, SD 65.00, magnesium 97.32 mg · kg–1, SD 33.16, iron 119.48 mg · kg–1, SD 83.31 and titanium 2.368 mg · kg–1, SD 2.097. In case of these elements, differences depending on gender and age were statistically insignificant. Mean content of sulphur in the European bison hair amounted to 3.41% with equalized content in the herd (SD 0.22%). Here also statistically insignificant differences depending on gender were observed. However, a statistically significant difference (p ≤ 0,05) was demonstrated which depended on animal age. Mature European bisons had more sulphur in hair as compared to calves. The concentration of vanadium (0.362 mg · kg–1, SD 0.396 on the average) significantly differed in hair depending on the European bison age with much higher values in adult animals (calves 0.260 mg · kg–1, animals older than 2 years 0.686 mg · kg–1). Similar data were obtained while investigating hair of sea mammals.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
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:
Monitoring cetyńców (Tomicus sp.) w różnych typach siedliskowych lasu
Monitoring of pine−shoot beetles (Tomicus sp.) in different forest habitat types
Autorzy:
Lesniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/973063.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Tomicus piniperda
bonitacja siedliska
cetyniec mniejszy
lesnictwo
drzewostany sosnowe
klasy wieku
owady
Tomicus minor
monitoring
typy siedliskowe lasu
szkodniki roślin
entomologia leśna
cytniec większy
pine−shoot beetle (tomicus sp.)
forest habitat type
age class
bonitet class
Opis:
The paper synthesises results from the study on pine−shoot beetles occurring in 10 types of forest habitat in seven forest districts of central Poland. The paper provides assessment of three methods for collecting insect−induced needle drop, as well as its quantities in age and bonitet classes in pure and mixed pine stands.
Źródło:
Sylwan; 2003, 147, 11; 61-67
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The population structure and regeneration of Sorbus torminalis in Hadecka planinka National Nature Reserve (Czech Republic)
Autorzy:
Madera, P.
Kohoutek, M.
Senfeldr, M.
Repka, R.
Powiązania:
https://bibliotekanauki.pl/articles/41463.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
population structure
regeneration
Sorbus torminalis
wild service tree
age structure
forest system
species protection
chequer tree zob.wild service tree
checker tree zob.wild service tree
Hadecka Planinka National Nature Reserve
Czech Republic
Opis:
We performed a detailed overall field survey of all specimens of the wild service tree Sorbus torminalis (L.) Crantz in the research area in the Hádecká planinka National Nature Reserve. This research area, with an area of 80 ha, contains one of the largest populations of the tree in Europe. In all, 1713 specimens were found. This study provides a detailed description of the wild service tree population in the area. The basic biometric parameters (height, GBH, social position, fertility) of thepopulation were assessed. The main emphasis of our analysis was to evaluate the population's age structure. We used estimates of age structure based on the Chapman-Richards growth function to perform this evaluation. During the past twenty years, the natural regeneration of the wild service tree in the nature reserve has decreased considerably. At an experimental plot where a high forest was converted to a coppice with standards, regeneration occurred over 75% of the area. Root suckers were found at the beginning of the observation period. After 2–3 years, generative regeneration occurred.
Źródło:
Dendrobiology; 2012, 68
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainability of Picea abies of Istebna provenance in Dupniański Stream catchment as dependent on stand age class
Autorzy:
Malek, S
Powiązania:
https://bibliotekanauki.pl/articles/41396.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
international conference
Europe
forest ecosystem
plant breeding
tree
Norway spruce
Picea abies
sustainability
provenance
Dupnianski Stream catchment
stand age class
Silesian Beskids Mountains
Polska
Opis:
Ecochemical indexes such as soil buffer reaction (pH), acid neutralising capacity (ANCaq), alkalinity (ALK), soil acidity (Ma%), basic cation saturation (BS), and molar ratios Ca:Al and BC:Al were used to study the sustainability of Norway spruce of Istebna provenance in stands differing in age class. The data were obtained from the research conducted in the Dupniański Stream catchment in the Silesian Beskid Mts. (Poland). The acid neutralising capacity, alkalinity, and soil acidity were found to depend on the age of spruce stands. The increased acidification of deposits was due to the presence of sulphate and nitrate ions which were washed out from the surface of plants. Passing through the canopy caused a decrease in the acid neutralising capacity, alkalinity, and base cation saturation, and an increase in the soil acidity, with the values being dependent on stand age. The soil acid reaction shifted to the range of the aluminium and iron bufferness, but the Ca:Al and BC:Al ratios were still above the level when aluminium stress is probable. The washout of the basic cations beyond the spruce root system, and the low levels of exchangeable Mg2+ and Ca2+, basic cation saturation of soil water, and effective base saturation of soil may affect the vitality and health of spruce stands in the future. To maintain the sustainability of Norway spruce stands of Istebna provenance in the Dupniański Stream catchment it is necessary to increase the retention of basic elements, especially Mg2+ and Ca2+, by means of stand conversion or fertilisation.
Źródło:
Dendrobiology; 2009, 61 Supplement
1641-1307
Pojawia się w:
Dendrobiology
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
Wyświetlanie 1-15 z 21

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