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Tytuł:
Wpływ warunków pogodowych na występowanie w młodnikach chorób aparatu asymilacyjnego
Influence of weather conditions on assimilative aparatus diseases occurrence in young stands
Autorzy:
Mychayliv, O.
Sierota, Z.
Lech, P.
Powiązania:
https://bibliotekanauki.pl/articles/60179.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
lesnictwo
mlodniki
drzewa lesne
choroby aparatu asymilacyjnego
osutka sosny
skretak sosny
zamieranie pedow sosny
maczniak prawdziwy debu
prognozowanie
warunki meteorologiczne
Opis:
W pracy określono i sprecyzowano charakter zależności pomiędzy występowa w drzewostanach do 20 lat najistotniejszych, z gospodarczego punktu widzenia, chorób infekcyjnych aparatu asymilacyjnego drzew leśnych, a warunkami pogodowymi. W analizach wykorzystano do tego celu dane o występowaniu w Polsce osutki sosny, skrętaka sosny, zamierania pędów sosny i mączniaka dębu w uprawach i młodnikach z okresu 1975-2004 oraz informacje meteorologiczne z 30 stacji zlokalizowanych na terenie kraju z lat 1966-2005. W obliczeniach uwzględniono łącznie 130 wskaźników pogodowych, odnoszących się do tempera-tury powietrza i gleby, opadów atmosferycznych, wilgotności powietrza, syntetycznych wskaźników hydrotermicznych (średnie miesięczne, roczne, sezonowe, wieloletnie) oraz ich odchyleń od średnich wieloletnich. Do określenia najsilniej związanych z występowaniem chorób zmiennych pogodowych stosowano analizę korelacyjną i analizę składowych głównych, zaś funkcję zależności pomiędzy występowaniem chorób i wybranymi czynnikami pogodowymi określono przy użyciu analizy regresji wielokrotnej. Dla wszystkich analizowanych chorób stwierdzono silną, statystycznie istotną zależność pomiędzy areałem występowania chorób w danym roku, a różnymi charakterystykami meteorologicznymi z tego samego roku, jak i z lat poprzednich.
The relationship between weather conditions and most important economically infectious diseases of assimilative apparatus of forest trees was investigated for stands up to 20 years old. The analyses were based on data of Scots pine needle cast, twisting rust, shoot dieback, oak powdery mildew occurrence in Poland from the years 1975-2004 and meteorological data from 30 stations located all over the country from the years 1966-2005. There were 130 meteorological parameters of air and soil temperature, precipitation, humidity, synthetic hydrothermal coefficients (in forms of monthly, seasonal, annual and multi-annual means) as well as their deviations from multi-annual averages used in the calculations. To determine most influential for disease occurrence weather variables correlation and principal component analyses were applied, while multiple regression analysis was used to determine the dependence between diseases occurrence and selected weather parameters. For all analyzed diseases statistically significant dependence was found, most pronounced for meteorological parameters of the year of disease appearance as well as from one-two years earlier.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2011, 06
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring uszkodzeń spowodowanych przez jeleniowate w młodych drzewostanach i odnowieniach Gorczańskiego Parku Narodowego
Monitoring of the deer-related damage to the young stands and regeneration in the Gorczanski National Park
Autorzy:
Miścicki, S.
Żurek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/989815.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy
Gorczanski Park Narodowy
drzewostany mlode
odnowienia lasu
odnowienia podokapowe
szkody w lesie
uszkodzenia drzew
szkody lowieckie
jeleniowate
monitoring
bark−stripping
browsing
district
impact
protection
stem
terminal shoot
Opis:
Assessment of the impact of large herbivores on young generation of trees in the protected forests can support decisions about whether to intervene in natural ecosystems (e.g. individual tree protection, animal culling) or not. A study on the condition of forest regeneration, including the assessment of the damage caused by deer, was performed in the Gorczański National Park (GNP; southern Poland) in 1993 for the first time. The inventory was repeated in 1996 and 2011 on the same 415 concentric permanent sample plots located in the centers of 400×400 m grid. Trees with diameter <16 cm or height 1.3 m were counted. The impact of deer was assessed using: (i) the share of browsed terminal shoots in h=0.3−1.3 m class trees and the tolerable (based on a reference) share of browsed trees of such height with the most damaged tree species taken into account and (ii) the proportion between the density of recently (the previous year) debarked, frayed or broken trees and the tolerable (based on a reference) density of such trees. The main interpretation unit was composed of all stands in the GNP, while stands in particular protection districts formed lower level. Over the time, the density of trees in the regeneration layer increased (fig. 1). The density of recently debarked (frayed or broken) trees decreased considerably (fig. 2), even if a large number of trees (especially silver fir) with old wounds existed (fig. 4). The density of the browsed trees remained more or less unchanged. This type of damage most frequently affected silver fir, sycamore maple and rowan (fig. 3). Differences between the level of forest regeneration damage in different protection districts of the GNP remained similar (fig. 5). The deer impact assessed on the basis of the density of debarked trees significantly decreased to be classified as tolerable in 2011. However, the impact assessed with the share of trees with the browsed terminal shoot did not reach the tolerable level in one protection district. Results show that measures undertaken to protect forest regeneration produce a partially positive effect. The browsing level was still too high. Differences in the deer impact on the forest regeneration between protection districts can be considered as permanent ones.
Źródło:
Sylwan; 2015, 159, 06; 505-515
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości ograniczania liczebności populacji kornika modrzewiowca Ips cembrae (Heer) (Coleoptera, Curculionidae, Scolytinae) w drzewostanach modrzewiowych południowej Polski
Possibility of the reduction of Ips cembrae [Heer] [Coleoptera, Curculionidae, Scolytinae] populations in larch stands in southern Poland
Autorzy:
Grodzki, W.
Powiązania:
https://bibliotekanauki.pl/articles/1009493.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
ochrona lasu
drzewostany modrzewiowe
modrzew
Larix
szkodniki roslin
kornik modrzewiowiec
Ips cembrae
wystepowanie
liczebnosc
ograniczanie liczebnosci
pulapki feromonowe
stosy pulapkowe
ciecia sanitarne
ips cembrae
larix
young stands
traps
pheromones
thinningg
Opis:
Selected methods of the larch bark beetle control were tested in the areas of its increased occurrence. Trap piles without pheromone, especially of "crossed" type, are recommended control method. Pheromone traps are useful rather for the survey due to low captures of beetles. The thinning is possible all over the year, but with removal of trees, as the trees felled in autumn are still attractive for bark beetles the next spring.
Źródło:
Sylwan; 2010, 154, 03; 160-167
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physiological workload of workers employed during motor-manual timber harvesting in young alder stands in different seasons
Autorzy:
Grzywiński, Witold
Turowski, Rafał
Jelonek, Tomasz
Tomczak, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/2085735.pdf
Data publikacji:
2022-08-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
forestry
heart rate
energy expenditure
logging
winter
summer
Opis:
ObjectivesThis study examined the physiological strain experienced by workers employed in motor-manual timber harvesting performed in winter and summer, and the applicability of heart rate indices for estimating energy expenditure.Material and MethodsThe heart rates (HR) of 2 teams consisting of 2 persons working simultaneously during felling and forwarding, in both winter and summer, were measured. Heart rate at work (HRwork), resting heart rate (HRrest), relative heart rate (%HRR), ratio of working heart rate to resting heart rate, and 50% level were used to estimate the physiological workload in particular jobs. The HRindex (HRwork/HRrest) equation was used to estimate the energy expenditure (EE). ResultsFor all jobs, significantly higher physiological workload and energy expenditure were recorded during winter.ConclusionsThe season significantly affects the physiological workload during logging operations. If there is no possibility of harvesting wood in summer, in order to limit the workload of workers during winter activity, attention should be paid to the proper organization of work and selection of workers.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2022, 35, 4; 437-447
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Above- and below-ground tree parameters and their development after modelling of thinning in young elm stands
Autorzy:
Šrámek, Martin
Hurt, Václav
Čermák, Jan
Powiązania:
https://bibliotekanauki.pl/articles/956995.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
elm
leaf area
absorptive root area
biomass
thinning
Opis:
During the last century almost two-thirds of all elms were lost due to the Dutch elm disease. Therefore, elms are an endangered species with a lasting lack of knowledge about ecosystem functions of elms in forest stands. The study describes several above- and below-ground tree parameters and their changes after simulation of thinning in one young forest stand with dominant Ulmus laevis Pall. in the Czech Republic. The distribution of the leaves was measured using the ‘cloud’ technique. The absorptive root area was measured with the aid of the modified earth impedance method to evaluate below-ground tree parameters. Using allometric equations, it was possible to calculate certain tree parameters of individual trees as well as the entire forest stand. The modelling of four thinning intensities (low, medium, high and very high) helped to establish the changes of these tree parameters after treatment. The leaf area index of the stand was 5.6, the absorptive root area index was 1.7 and the total biomass of foliage was 8.5 Mg ha–1 prior to the treatment. The absorptive root area amounted to 30% of the foliage area. The exponential models were developed to predict the above- and below-ground tree parameters. Under the different thinning intensities, the following were found: a negative correlation with the number of trees for the leaf area index, the foliage biomass and the absorptive root area index. This knowledge is important in the process of maintaining the presence of endangered elms in forest stands and in ecosystem services (e.g. carbon storage) throughout Europe.
Źródło:
Dendrobiology; 2017, 77; 77-90
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Age-related changes in leaf area index of young Scots pine stands
Autorzy:
Jagodzinski, A M
Kalucka, I.
Powiązania:
https://bibliotekanauki.pl/articles/41483.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Scotch pine
Pinus sylvestris
leaf area index
age-related change
young tree
pine stand
allometric equation
chronosequence
Opis:
We studied the chronosequence of six Scots pine (Pinus sylvestris L.) plantations (6-, 9-, 11-, 15-, 17-, and 20-years-old) to examine the changes in leaf area index (LAI) over stand age. The study site was located on a mine spoil heap (outer dumping ground) in the Belchatow lignite open-cast mining district (central Poland). The main goal of the study was to analyze LAI changes over stand age in a chronosequence of young Scots pine stands and to test the relationship between LAI estimates derived from a LAI-2000 Plant Canopy Analyzer and site-specific allometric equations. In addition, we tried to determine whether LAI estimated by a LAI-2000 PCA can be used to accurately estimate forest biomass. We hypothesized that LAI-2000 PCA underestimates LAI of the stands, and that stand age (and linked stand parameters) may influence the range of the hypothetical underestimation due to changes in biomass allocation. Our study revealed that LAI was highly dependent upon stand age and tree density (p<0.0001) regardless of the way how LAI was determined. Moreover, we found that LAI estimated by LAI-2000 PCA significantly correlates with stand biomass per area; the highest coefficients of determination were found for total aboveground biomass, aboveground woody biomass, and stem biomass. This means that data obtained by LAI-2000 PCA are good predictors of stand biomass in the young stages of stand development. In contrast to our prior assumption, the results showed that LAI-2000 PCA overestimates leaf area index. The relative differences between the values obtained with LAI-2000 and those calculated on the basis of the site-specific allometric equations increase with age. This may reflect changes in crown architecture over age caused by enlarging tree dimensions and over - crowding of trees leading to deterioration of light conditions inside the canopy.
Źródło:
Dendrobiology; 2008, 59; 57-65
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomass dynamics in young silver birch stands on post-agricultural lands in Central Poland
Autorzy:
Zasada, M.
Bijak, S.
Bronisz, K.
Bronisz, A.
Gaweda, T.
Powiązania:
https://bibliotekanauki.pl/articles/52729.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
biomass dynamics
young tree
silver birch
stand
secondary succession
afforestation
biomass allocation
post-agricultural land
Central Poland
Opis:
The paper analyses the production and allocation of biomass in young, spontaneoussilver birch afforestation occurring on post-agricultural lands in the Mazowszeregion (central Poland). We investigated 114 sample plots of age varying from 1 to 19 years. During the first 15 years after their establishment on abandoned farmland, the naturally regenerated silver birch stands produced on average approximately 75 tons of dry biomass per hectare. The major (50–70%) part of this biomass was stored in the tree stems and this share increased with age. The fractions of biomass in the foliage and roots decreased over time, while the share of biomass in the branches remained rather constant. The significant age-dependency of the allometric relationships suggested the need to use age-sensitive biomass expansion factors to estimate the biomass from the stem volume.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 192
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zagęszczenie i dynamika procesu wydzielania drzew w młodocianych drzewostanach brzozowych na gruntach porolnych
Stand density and self-thinning dynamics in young birch stands on post-agricultural lands
Autorzy:
Socha, J.
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/991052.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
grunty porolne
uprawy lesne
drzewostany brzozowe
drzewostany mlode
zageszczenie drzew
wydzielanie sie drzew
self−thinning
silver birch
abandoned farmlands
stochastic frontier function
quantile regression
Opis:
The study describes allometric relationships between stand density and tree dimensions in birch stands on post−agricultural lands. The research material consisted of measurements carried out on 120 sample plots located in birch stands on post−agricultural lands of Central Poland. The investigated relationship was analyzed using ordinary least squares (OLS), dynamical formulation of allometric function (DFA), stochastic frontier production function (SFF) as well as quantile regression (QR) methods. Similar effects of modeling maximum density were obtained as a result of applying FFP and QR methods with 0.9 quantile. SFF was found to be the most adequate method for modeling maximum density.
Źródło:
Sylwan; 2014, 158, 05; 340-351
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aboveground biomass allocation and accumulation in a chronosequence of young Pinus sylvestris stands growing on a lignite mine spoil heap
Autorzy:
Jagodzinski, A.M.
Kalucka, I.
Horodecki, P.
Oleksyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/41764.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
aboveground biomass
allocation
accumulation
chronosequence
age
young plant
Pinus sylvestris
stand
lignite mine
spoil heap
Opis:
It is not clear to what extent trees growing on anthropogenic sites change their growth and biomass allocation to different organs. We assessed the aboveground biomass in a chronosequence of six Scots pine monocultures (between 6 and 20 years old) to examine how precisely the site-specific or control allometric equations may reflect the value of biomass accumulation and allocation in stands growing in harsh site conditions on the overlayer spoil heap made as a result of opencast brown coal mining. The site is characterized by poor edaphic and water conditions and nutrient deficiency. The control equations were developed from Scots pine stands growing on post-agricultural lands in the close vicinity of the spoil heap. We found that equation type significantly influenced results of predicted biomass accumulation for all biomass components studied (although results were only marginally significant for total aboveground biomass, P=0.08). Total aboveground biomass in younger stands (6–9 years old) estimated using site-specific equations was >40% higher and for older stands (17–20 years old) from 7 to 27% lower than estimated using equations developed for the control sites. Our study revealed that under harsh environmental conditions in spoil heaps, biomass of young Scots pine stands significantly differ from values calculated based on control equations developed for more fertile soils with better water conditions in the same region. The control biomass equations may not be suitable to estimate biomass accumulation in stands growing on infertile habitats with poor water conditions, if the control equations are developed for nearby stands but growing under better site conditions.
Źródło:
Dendrobiology; 2014, 72
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efektywność pozyskiwania drewna harwesterem w młodszych trzebieżowych drzewostanach sosnowych w zależności od technologii pracy
Efficiency of timber harvesting using harvester in thinned young pine stands as a function of working technique
Autorzy:
Stańczykiewicz, Arkadiusz
Szewczyk, Grzegorz
Brzoza, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/18055686.pdf
Data publikacji:
2023
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
metoda drewna krótkiego z międzypolem
trzebieże wczesne
pozyskanie ręczno-maszynowe
pozyskanie maszynowe częściowo zautomatyzowane
wydajność pracy
czasochłonność pracy
CTL method with midfield
early thinning
motor-manual logging
semi-automated logging
work efficiency
worktime consumption
Opis:
In Poland, more and more timber is harvested with the use of harvesters of different types. These machines can also be used in cooperation with chainsaw operators, e.g. in stands damaged by violent winds, in the removal of windthrows, or in stands of younger age classes in the technological variant with the so-called „midfield”. The aim of the study was to characterise the working time structure and to estimate the efficiency of timber harvesting with a harvester in two technological variants. In the first variant, the felling of trees was carried out by a chainsaw operator and the processing was performed by a harvester operator. In the second variant all operations were carried out by a harvester operator. In both variants, the machine worked on the skid trails, but in the second variant, the operator descended from the skid trails a short distance into the stand. Harvesting was conducted in two pine stands that were approximately the same age and differed in site conditions. The structure of the harvester operator's work time was clearly dominated by the moving of felled trees to the skid trails in both variants. Of all the activities studied, the observed differences between their durations in both variants were insignificant only in the case of delimbing and bucking (processing). In the case of cooperation between harvester operator and chainsaw operator, a higher work efficiency was achieved than in the case of timber harvesting with a harvester alone. At the same time, significantly lower work time consumption was observed. However, when considering the efficiency of the entire technologies, thinning with two workers was 30-60% more time consuming. Significant relationships were found between the amount of merchantable timber of harvested trees and the efficiency of the harvester operator.
Źródło:
Leśne Prace Badawcze; 2023, 83; 16-24
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fine roots biomass and morphology in a chronosequence of young Pinus sylvestris stands growing on a reclaimed lignite mine spoil heap
Autorzy:
Jagodzinski, A.M.
Kalucka, I.
Powiązania:
https://bibliotekanauki.pl/articles/2130192.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
root
biomass allocation
morphology
chronosequence
young plant
Pinus sylvestris
Scotch pine
stand
growing
reclaimed area
post-industrial area
mine dump
lignite mine
spoil heap
Opis:
The morphology of fine roots ( 2 mm diameter) as well as fine and coarse root biomass was investigated in a chronosequence consisting of 6-, 9-, 11-, 15-, 17- and 20-year-old Scots pine (Pinus sylvestris) stands growing on a reclaimed lignite mine spoil heap. Core method of destructive root sampling was used to establish whether root morphology and biomass varied with stand age in the upper 20 cm of soil. Fine root biomass ranged from 0.78 to 3.11 Mg ha-1, coarse root biomass ranged from 0.82 to 2.74 Mg ha-1, whereas root necromass ranged from 1.03 Mg ha-1 to 2.87 Mg ha-1 in the chronosequence studied. Fine root diameter as well as length, projected area, and surface area expressed per unit area increased significantly with stand age. Moreover, our study revealed that when stand age increases, specific fine root biomass increases, whereas specific root length and area decreases. The results support our hypothesis that stand age has an effect on standing fine root biomass and morphology.
Źródło:
Dendrobiology; 2010, 64; 19-30
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ przerzedzenia okapu górnego na rozwój podrostów sosny zwyczajnej (Pinus sylvestris L.) w pogradacyjnych drzewostanach w Lasach Pilskich
Response of Scots pine [Pinus sylvestris L.] young-growth stands to an overstorey canopy in the postoutbreak stands in Pila Forests
Autorzy:
Andrzejczyk, T.
Powiązania:
https://bibliotekanauki.pl/articles/1016341.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
stopien przerzedzenia okapu gornego
rozwoj roslin
odnowienia lasu
hodowla lasu
podrost
sosna zwyczajna
lesnictwo
odnowienia naturalne
odnowienia podokapowe
Pinus sylvestris
drzewa lesne
scots pine
pinus sylvestris l.
natural regeneration
undercanopy young−growth stands
postoutbreak
stands
poland
Opis:
In the paper the density, height, diameter, slenderness and vitality of the 17 year−old pine young−growth stands depending on the basal area of the shelterwood (four thinning variants: G1−G4). The studies were carried out in eleven 70−90 year−old pine stands heavily damaged in the 80s of the past century by the nun moth (Lymantria monacha L.). With the development of the overstorey the growth, the vitality and the stability of young stands declined. In addition, a decrease in the survival of the young−growth stands under the dense canopy (variant G4) was recorded. A long−term maintenance of young stands under the shelter of the canopy in the areas of low annual precipitation (below 600 mm) requires the reduction of the dbh basal area to the level of at least 15 m3/ha before attaining the age of 15 years.
Źródło:
Sylwan; 2007, 151, 01; 20-29
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Długotrwałe efekty różnego nasilenia trzebieży selekcyjnej w drzewostanie sosnowym
Long-term effects of different thinning intensity in young Scots pine stands
Autorzy:
Zachara, T.
Powiązania:
https://bibliotekanauki.pl/articles/986702.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
hodowla lasu
drzewostany sosnowe
zabiegi pielegnacyjne
trzebiez selekcyjna
sosna zwyczajna
Pinus sylvestris
wzrost roslin
jakosc hodowlana
scots pine
silviculture
tending cuts
basal area increment
stand resistance
Opis:
The paper describes a case study of thinning experiment established in 1976 with a use of random block design in 21−year−old Scots pine stand in Janów Lubelski Forest District (south−eastern Poland). The stand was subjected to no thinning (control variant K), weak thinning with removal of 10% of basal area (variant S1), strong thinning with removal of 30% of basal area (variant S3) and extreme thinning, where only future crop trees and some reserve trees were left (variant TE). S1 and S3 treatments were repeated each 5 years, while in TE treatment the 20−year interval was applied. During the period of 40 years all trees were measured each 5 years and current basal area increment was calculated for the whole stand and for future crop trees population. The relative increment of future crop trees population calculated as a percentage of stand total increment was taken into account too. Data were subjected to ANOVA and differences were compared with Tukey test. The results showed that total stand increment was not influenced by thinning intensity. The future crop trees increment was significantly higher in a case of extreme thinning in comparison to weak thinning and to the control treatment during the first 20 years of experiment (age 21−41). During the second 20 years (age 41−61) only relative basal area increment of future crop trees population was significantly higher on the plots with extreme thinning in comparison to other treatments. The results suggest that a weak thinning brings no silvicultural effect meant as increased growth of previously selected future crop Scots pines. Strong or very strong thinnings give a long−term growth effect and they can be acceptable, but in healthy and well−tended young pine stands only.
Źródło:
Sylwan; 2017, 161, 09; 730-737
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Productivity and economic effectiveness of young black locust tree stands on afforested sulphur opencast mine sites
Autorzy:
Likus-Cieślik, J.
Leńczuk, D.
Woś, B.
Lubera, A.
Pająk, M.
Pietrzykowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/28407528.pdf
Data publikacji:
2023
Wydawca:
Instytut Badawczy Leśnictwa
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2023, 65, 2; 86-95
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przydatność tarczy ślizgowej do wyciągania drewna z międzyrzędów w młodnikach sosnowych
Prigodnost' skol'zjashhego shhita dlja vytaskivanija drevesiny iz mezhdurjad'ev v sosnovykh molodnjakakh
Usefulness of a skidding shield in the extraction of wood from between rows in young pine stands
Autorzy:
Gornowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/813819.pdf
Data publikacji:
1988
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
pozyskiwanie drewna
mlodniki sosnowe
zrywka drewna
tarcze slizgowe
przydatnosc
Źródło:
Sylwan; 1988, 132, 11-12
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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