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Wyszukujesz frazę "forest stand" wg kryterium: Temat


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Tytuł:
Koncepcja kwalifikowania drzewostanów do przebudowy
The concept of classifying the forest stands for conversion
Autorzy:
Łopiński, L.
Stępień, E.
Powiązania:
https://bibliotekanauki.pl/articles/1015678.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
kryteria kwalifikacji
drzewostany
przebudowa drzewostanow
lesnictwo
forest stand conversion
silviculture objective
forest stand stability
stock level
forest functions
conversion urgency
Opis:
The paper presents a set of criteria helpful in assessment of the conversion need. Variant I assumes the analysis of the multifunctional forest redevelopment need i.e. with no priority function. Variant II allows typing the forest stands that need conversion based on the possibility of playing a recreational, protection and productive function. The presented classification of forest stands based on the conversion need and its urgency was conducted on the basis of data from the forest inventory.
Źródło:
Sylwan; 2008, 152, 05; 34-43
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja oceny stanu drzewostanów na podstawie wybranych cech taksacyjnych
A concept of stand condition assessment based on selected taxation characteristics
Autorzy:
Łopiński, L.
Powiązania:
https://bibliotekanauki.pl/articles/1015624.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
cechy taksacyjne
drzewostany
zapas rosnacy
kryteria
stabilnosc
realizacja celu hodowlanego
przebudowa drzewostanow
lesnictwo
stand conversion
silvicultural objective
stand stability
standing stock volume
forest functions
Opis:
The obligatory method of classifying stands for conversion requires adjustment to the needs of pro−ecological, multifunctional forest management. The study presents a set of criteria that can be useful for the reliable evaluation of stand condition. The proposed method was used to evaluate the fulfilment of the silvicultural objective, stand stability, as well as the status and volume of growing stock. Indicators used to assess these characteristics together with defined significance levels (weights) are an original element of the study. The indicators were selected in such a way as to describe a given characteristic in the context of conversion needs, which is the aim of the presented analysis of stand condition.
Źródło:
Sylwan; 2008, 152, 06; 14-21
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekologiczne konsekwencje hodowli drzew w różnym zagęszczeniu III. Stabilność drzewostanu, fitoklimat i różnorodność biologiczna
Ecological consequences of silviculture at variable stand densities. III. Stand stability, phytoclimate and biodiversity
Autorzy:
Jagodziński, A.M.
Oleksyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1011879.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wiezba drzew
zageszczenie poczatkowe
drzewostany
roznorodnosc biologiczna
mikroklimat
lesnictwo
ekologia lasu
stabilnosc drzewostanu
zageszczenie roslin
stand density
spacing
tree competition
forest ecology
stand stability
microclimate
biodiversity
review
Opis:
The main goal of this review was to characterize ecological consequences of growing trees at variable stand densities. We analyzed the influence of stand density on its mechanical and biological stability, diversity and biomass of understory plants and microclimate conditions (e.g. temperature, humidity, light, etc.). Higher stand density results in higher susceptibility to wind and snow damage, due to changes in height to diameter ratio (tree slenderness). The mechanical stability of stands may be promoted by silvicultural activities such as light thinning applied before growth stagnation. In addition, the reduction of stand density during stand development may increase biomass allocation to coarse roots that stabilize trees in the soil. High tree density may increase stand susceptibility to pathogens and insects and thus increase tree mortality. Trees growing at higher density (with higher intraspecific competition) may allocate less assimilates for defense against herbivorous insects and pathogens. The effect of tree density on stability of multi−species stands is inconclusive, since such studies were only occasionally undertaken. Since tree density influences light conditions (mainly before canopy closure), there is a negative relationship between stand density and herbaceous species diversity and biomass. Based on the published data, we summarized consequences of silviculture at different stand densities and proposed future directions of research needed to fill the gaps in current knowledge. Understanding the long−term ecological consequences of variable stand densities is essential for development of sustainable and stable forest ecosystems.
Źródło:
Sylwan; 2009, 153, 04; 219-230
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urządzanie lasu na ziemiach polskich - opis drzewostanów w XIX wieku
Forest management on Polish lands - tree stand description in the 19th century
Autorzy:
Jaszczak, R.
Wajchman, S.
Taryma, B.
Powiązania:
https://bibliotekanauki.pl/articles/991630.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
historia
drzewostany
opis drzewostanu
urzadzanie lasu
wiek XIX
19th century
polish lands
forest management
tree stand description
Opis:
In the 1800s forest management in Polish forests was still in its infancy. This article reminds presents tree stands were described in those days. The then concepts of: the forest, tree stand, bare land and large tree group were explained. In addition, the notion as well as the method of determination of the stand species composition and its age, perpendicular structure, closure, mixture proportion, stocking and condition was discussed in detail. For this purpose, available nineteenth century instructions, glossaries and books were employed.
Źródło:
Sylwan; 2013, 157, 10; 793-800
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie modelu macierzowego do prognozowania rozwoju drzewostanów o złożonej postaci
Application of matrix model for projecting the development of stands with complex structure
Autorzy:
Drozdowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1019340.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany
wykorzystanie
modele macierzowe
prognozowanie
lesnictwo
modele matematyczne
rozwoj drzewostanu
forest modelling
linear and non−linear programming
stand with complex structure
silvicultural planning
Opis:
In this study, the principles of building, parameterisation and validation of matrix models of stands are presented. Three basic processes occurring in stand development such as regeneration, growth and dieback of trees are discussed. The study points out to the potential advantages and directions of application of stand matrix models in solving silvicultural problems.
Źródło:
Sylwan; 2006, 150, 02; 3-13
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ stosowanych technologii pozyskiwania drewna przez Zakłady Usług Leśnych na obecną i przyszłą jakość techniczną sosnowych drzewostanów przedrębnych
The effect of harvesting systems used by Forest Services Companies on the present and future technical quality of premature pine stands
Autorzy:
Zastocki, D
Powiązania:
https://bibliotekanauki.pl/articles/1026391.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
drzewostany
metody pozyskiwania drewna
uzytkowanie lasu
Zaklady Uslug Lesnych
lesnictwo
jakosc
drzewostany przedrebne
pozyskiwanie drewna
forest services companies
stand damage
thinnings
kraft class
harvesting system
poland
Opis:
The aim of the paper is to determine the degree of damage of trees in a stand in the Kraft classes and diameters at breast height of trees in the damaged and undamaged stands depending on the harvesting system applied by Forest Services Companies. Field studies were carried out in the Polish lowlands in pine stands in the age classes II a, III a and IV a in the fresh forest habitat (Bśw) and mixed fresh forest habitat (BMśw). The prevailing species is pine (minimum 80%), and the assortment and tree−length methods are used for timber harvest. The thinning operations cause injuries to trees in the remaining stands and the scale of these injuries depends mainly on labour organisation.
Źródło:
Sylwan; 2003, 147, 03; 28-34
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kształtowanie zróżnicowanej struktury drzewostanów w warunkach nizinnych
Promoting diverse forest stand structure under lowland conditions
Autorzy:
Brzeziecki, B.
Drozdowski, S.
Bielak, K.
Buraczyk, W.
Gawron, L.
Powiązania:
https://bibliotekanauki.pl/articles/994357.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Bialowieska
drzewostany
struktura drzewostanu
struktura warstwowa
struktura gatunkowa
ksztaltowanie struktury
postepowanie hodowlane
struktura grubosci
rozklad piersnic
metoda BDq
białowieża forest
close−to−nature silviculture
stand structure
silvicultural planning
stocking control
Opis:
The paper presents preliminary results and experiences concerning promoting diverse structures in forest stands dominated by light demanding tree species, i.e. those that prevail under conditions of Polish lowlands. Data was collected in the ‘Control Unit Browsk 28C', established in 2002 in the managed part of the Białowieża Forest (eastern Poland) and surveyed again in 2011.
Źródło:
Sylwan; 2013, 157, 08; 597-606
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekologiczne konsekwencje hodowli drzew w różnym zagęszczeniu II. Produkcja i alokacja biomasy, retencja biogenów
Ecological consequences of silviculture at variable stand densities. II. Biomass production and allocation, nutrient retention
Autorzy:
Jagodziński, A.M.
Oleksyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1011811.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wiezba drzew
zageszczenie poczatkowe
mikroelementy
lesnictwo
skladniki pokarmowe
ekologia lasu
makroelementy
zageszczenie roslin
dostepnosc skladnikow pokarmowych
wymiana gazowa
drzewostany
biomasa
alokacja biomasy
stand density
spacing
tree competition
forest ecology
biomass allocation
nutrient retention
review
Opis:
The main goal of this review was to characterize ecological consequences of growing trees at variable stand densities. Increasing stand density results in rising competition among trees in their below− and above− ground parts, leads to changes in stand structure (DBH, height, crown width and length, crown ratio, tree slenderness, branch diameters and length) and thus modifies biomass partitioning and may influence stand productivity. Trees grown at higher density compete more intensely for limited resources such as space, light, water and nutrients, than in those grown at wider spacing. In general, total tree biomass accumulation is higher in more dense stands and in less dense stands a higher proportion of biomass is allocated to coarse roots. Moreover, stand density may alter foliage distribution within the crowns. For stands grown at higher tree density, leaf area index (LAI) may increase and thus influence stand productivity, however LAI is closely related to light requirements and succession status of the species. Because stand density may simultaneously modify macro− and micronutrient concentration in different tree tissues and biomass partitioning, it may lead to distinct changes in the nutrient balance of the forest ecosystem. For example, a considerable pool of stand mineral elements (including carbon) is allocated to roots that are not subjected to traditional stand management. Therefore, manipulation of stand density leading to higher biomass allocation to roots may increase carbon sequestration in forest ecosystems.
Źródło:
Sylwan; 2009, 153, 03; 147-157
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany zachodzące w drzewostanach Bieszczadów
Changes in the forests of the Bieszczady Mts.
Autorzy:
Dmyterko, E.
Bruchwald, A.
Powiązania:
https://bibliotekanauki.pl/articles/985915.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy gorskie
Bieszczady
drzewostany
sklad gatunkowy
zmiany w drzewostanach
zmiany skladu gatunkowego
model wzrostu drzewostanu
modele ryzyka uszkodzenia
species composition
stand growth model
model allowable cut
wind damage risk model
forest threat
measure
Opis:
The aim of the study was to analyse (on the basis of the data from the State Forests Information System) the changes occurring in the Bieszczady forests in the period of 2007−2016. One of the processes taking place in the study area is the withdrawal of grey alder stands and the appear− ance of natural regeneration of mainly beech and fir, and in a smaller proportion spruce (fig. 1). Another natural process is the encroachment of fir and beech under the canopy of pine stands, which is favoured by fertile habitats that meet the ecological requirements of these two tree species. As a result of economic activity supporting these processes, alder and pine stands are being rebuilt relatively quickly, turning into fir or beech stands, and sometimes into mixed stands with the participation of other tree species, including spruce (fig. 1). The decline of spruce stands occurs on the dominant area in Poland: in Beskid Śląski and Beskid Żywiecki, the Kaszuby Forest or the Białowieża Forest. The main causes of this process are abiotic and biotic factors, including frequent droughts causing the lowering of the groundwater level and insect outbreaks, especially of bark beetles. The proportion of spruce in the Bieszczady Mountains is relatively small (about 10%), and the high fertility of the habitats compensates, to some extent, the relatively high moisture requirements of this tree species and probably these factors determined the lack of decline of spruce stands in the analysed area. In the last 10 years, the average age of forests in the Bieszczady Mountains increased from 77 to 83 years (tab. 2), mainly as a result of too low volume of harvested timber (fig. 3). Comparing the total harvested volume with the volume of allowable cut determined by the stand growth model, the harvest of the wood raw material was understated by about 25%. The aging of forests is also confirmed by changes in stands in age classes (fig. 2). The aging of the Bieszczady forests is correlated with the process of increasing the threat to these forests by wind (figs. 4−5). The wind damage risk factor increased over the next 10 years in the two highest threat level, and thus the area of threatened stands increased. The forest threat measure in the Bieszczady forests increased in general as well as in individual forest districts (fig. 6). The forests in two of these districts are currently among the most threatened in Poland.
Źródło:
Sylwan; 2018, 162, 05; 355-364
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania nad zamieraniem jesionu [Fraxinus excelsior L.] w drzewostanach Nadlesnictwa Wloszczowa
The studies on ash dying [Fraxinus excelsior L.] in the Wloszczowa Forest Unit stands
Autorzy:
Kowalski, T
Lukomska, A
Powiązania:
https://bibliotekanauki.pl/articles/28009.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Nadlesnictwo Wloszczowa
sklad gatunkowy
zamieranie wierzcholkow pedow
drzewa lisciaste
jesion wyniosly
plamistosc pedow
objawy chorobowe
zamieranie lisci
czynniki chorobotworcze
drzewostany
atrofia
Fraxinus excelsior
przebarwienia lisci
zamieranie drzew
zamieranie pedow
identyfikacja
grzyby chorobotworcze
Wloszczowa Forest Inspectorate
species composition
shoot apex
plant decline
deciduous tree
European ash
plant disease
shoot
pathogenic symptom
leaf decline
pathogenic factor
tree stand
atrophy
leaf discolouration
tree decline
shoot decline
identification
pathogenic fungi
Opis:
The studies were carried out in the Włoszczowa Forest Unit, in 9 ash stands differing in respect of age, origin (natural, artificial), site and in the nursery on 3 quarters differing due to a silvicultural method (transplanted and not transplanted) and seedlings age. In each stand an analysis of disease symptoms was carried out on 100 trees (2 - 20 years old stands) or 50 trees (21 - 80 years old stands) growing side by side in central part of the stand, while in the nursery in each block 200 seedlings were analyzed (4 sectors with 50 seedlings each). From the infected seedlings and trees 120 fragments of dead branches, living branches with cankers, and dead roots were taken. Identification of fungi was made on the basis of fructification and over 300 isolations of fungi on malt agar medium. The most frequent disease symptoms in ash stands were: the dead top (34.7% trees), the dying of whole branches (83.5%), the dying of the top of branches (20.1%), the occurrence of healed (36.0%) and unhealed cankers (18.9%) and the slime flux (23.7%) on the trunk, also the chlorosis of leaves (7.5%) and their atrophy (11.2%). Most of the types of disease symptoms appeared irrespectively of the tree age, origin and site, sometimes showing only a difference in the frequency of occurrence. On the seedlings in the nursery the shoot discolouration, healed and unhealed cankers on shoots and necrosis of a part of leaves were recorded most frequently. Disease symptoms occurred more frequently on 4-year-old seedlings in comparison with 3-year-old. In respect of transplanted seedlings the leaves dying was more frequent. Within cankers and on dead tops of shoots the most frequent were: Alternaria alternata, Chalara sp., Cytospora ambiens, Diplodia mutila, Fusarium lateritium, Gloeosporidiella turgida, Phomopsis controversa and Phomopsis scobina. In sparsely found dead roots of living trees appeared mostly: Cryptosporiopsis radicicola, Cylindrocarpon destructans and Phialocephala sp.
Badania prowadzono w Nadl. Włoszczowa w 9 drzewostanach jesionowych różniących się wiekiem, pochodzeniem (naturalne, sztuczne) i siedliskiem oraz w szkółce leśnej na 3 kwaterach różniących się sposobem hodowli (sadzonki szkółkowane, nie szkółkowane) i wiekiem sadzonek. W każdym drzewostanie dokonano analizy symptomów chorobowych u 100 (2 do 20-letnie drzewostany) lub 50 drzew (21 do 80-letnie drzewostany) rosnących obok siebie w części środkowej drzewostanu, zaś w szkółce leśnej na każdej kwaterze zbadano 200 sadzonek (4 sektory po 50 sadzonek). Z chorych sadzonek i drzew pobrano 120 fragmentów zamarłych gałęzi, żywych gałęzi z nekrozami oraz zamarłych korzeni. Identyfikacji grzybów dokonano na podstawie owocników oraz ponad 300 izolacji na pożywkę agarowo-maltozową. Do najczęstszych objawów chorobowych w drzewostanach jesionowych należały: zamieranie wierzchołków (34,7% drzew), zamieranie całych gałęzi (83,5%), zamieranie szczytów gałęzi (20,1%), obecność na pniu zabliźnionych (36,0%) i nie zabliźnionych nekroz (18,9%) oraz wycieków brunatnej substancji (23,7%), a także przebarwienie liści (7,5%) i ich atrofia (11,2%). Większość rodzajów objawów chorobowych występowała niezależnie od wieku drzew, pochodzenia i siedliska, wykazując jedynie niekiedy różnice w częstości występowania. Na sadzonkach w szkółce najczęściej stwierdzano plamistości na pędach, nekrozy zabliźnione i nie zabliźnione na pędach oraz nekrozę części liści. Objawy chorobowe częściej występowały u sadzonek 4-letnich w porównaniu z 3-letnimi. U sadzonek szkółkowanych częściej dochodziło do obumierania liści. W obrębie nekroz i na obumarłych szczytach pędów najczęściej stwierdzano grzyby: Alternaria alternatei, Chalara sp., Cytospora ambiens, Diplodia mutila, Fusarium lateritium, Gloeosporidiella turgida, Phomopsis controversa i Phomopsis scobina. W nielicznie stwierdzanych obumarłych korzeniach żywych drzew występowały głównie: Cryptosporiopsis radicicola, Cylindrocarpon destructans i Phialocephala sp.
Źródło:
Acta Agrobotanica; 2005, 58, 2; 429-439
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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