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Tytuł:
Zawartosc monoterpenow igliwia sosny zwyczajnej [Pinus sylvestris L.] narazonej na dzialanie emisji przemyslowych
Autorzy:
Chojnacki, B.
Cichy, W.
Powiązania:
https://bibliotekanauki.pl/articles/823989.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
zanieczyszczenia przemyslowe
zawartosc olejkow eterycznych
igliwie sosnowe
lasy
sosna zwyczajna
lesnictwo
monoterpeny
olejki eteryczne
Pinus sylvestris
Źródło:
Sylwan; 1995, 139, 04; 47-55
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Środowiskowe uwarunkowania inwazji tawuły kutnerowatej (Spiraea tomentosa L.) w Borach Dolnośląskich
Environmental determinants of the steeplebush (Spiraea tomentosa L.) invasion in the Bory Dolnoslaskie Forest
Autorzy:
Wiatrowska, B.
Danielewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/989618.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
krzewy lesne
gatunki inwazyjne
tawula kutnerowata
Spiraea tomentosa
wystepowanie
rozprzestrzenianie sie gatunkow
Bory Dolnoslaskie
spiraea tomentosa
alien species
invasive shrub
Opis:
The steeplebush is a shrub growing naturally in North America. In Europe this species has been cultivated as an ornamental plant since the 18th century. It has been observed in spontaneously developing secondary localities in such countries as Belgium, Denmark, Sweden, Norway and Germany. In Poland there are three regions in which Spiraea tomentosa is known to be a permanently established anthropophyte: Puszcza Drawska, Bory Niemodlińskie and Bory Dolnośląskie forests. The greatest number of localities of this shrub can be found in the extensive area of the latter, where its expansion has caused significant changes in the natural environment and problems in woodland management. Therefore a research was carried out to find what conditions made the steeplebush ready for invasion and what types of plant communities were especially susceptible to it. The information about the distribution of S. tomentosa in the Bory Dolnośląskie Forest (SW Poland) was collected during field observations in the years 2011−2014. We also verified and used the results of a survey made in 2011 in three forest districts located in the study area: Ruszów, Węgliniec and Wymiarki. The analysis concerned the frequency of the steeplebush in the forest environment in terms of the forest habitat type, species composition, and stand growth stage as well as in non−forest environments like meadows, peatland, margins of drainage ditches, etc. Phytocoenoses in the habitats of humid mixed coniferous forests and humid coniferous forests with mature tree stands dominated by birches or alders were found to be forest communities the most susceptible to colonisation by S. tomentosa. Especially susceptible to steeplebush invasion were also forest cultures on those habitats. Much fewer steeplebush localities were recorded on fresh and mixed coniferous forests as well as fresh broadleaved forests. In a non−forest environments the steeplebush was mostly noted on margins of drainage ditches. The extensive system of such man−made environmental structures in the Bory Dolnośląskie Forest was found to be the most important factor favouring the expansion of S. tomentosa. Thus, the invasion of the discussed species is primarily determined by a large proportion of humid habitats in a single compact woodland complex connected by a dense network of drainage ditches.
Źródło:
Sylwan; 2016, 160, 08; 696-704
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości przyspieszenia terminu chemicznych zabiegów zabezpieczających nie korowane drewno sosnowe przed cetyńcem większym
Vozmozhnosti uskorenija srokov khimicheskikh meroprijatijj predokhrahjajushhikh neokorennuju sosnovuju drevesiny ot bolshogo sosnovogo luboeda
Possibilities of earlier performance of chemical treatments protecting unbarked pine wood against tje larger pine-shoot beetle
Autorzy:
Glowacka, B.
Wajland, M.
Wilczynski, W.
Powiązania:
https://bibliotekanauki.pl/articles/810930.pdf
Data publikacji:
1988
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
szkodniki drewna
szkodniki wtorne
cetyniec wiekszy
drewno sosnowe
ochrona drewna
zwalczanie szkodnikow
terminy zwalczania
Źródło:
Sylwan; 1988, 132, 11-12
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura odnawiajacych sie drzewostanow sosny zwyczajnej w Nadlesnictwie Gubin
Autorzy:
Barzdajn, W.
Drogoszewski, B.
Zientarski, J.
Powiązania:
https://bibliotekanauki.pl/articles/814948.pdf
Data publikacji:
1996
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany wielopokoleniowe
drzewostany sosnowe
hodowla lasu
podrost
Nadlesnictwo Gubin
lesnictwo
struktura drzewostanu
odnowienia naturalne
Źródło:
Sylwan; 1996, 140, 11; 19-32
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany flory roślin naczyniowych runa leśnego w latach 1959-2016 na stałej powierzchni badawczej w oddziale 319 Białowieskiego Parku Narodowego
Changes of herb layer vegetation during the period 1959-2016 on the permanent study plot in the compartment 319 of Bialowieza National Park
Autorzy:
Brzeziecki, B.
Ciurzycki, W.
Keczyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/985863.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Bialowieski Park Narodowy
badania florystyczne
stale powierzchnie badawcze
runo lesne
flora
gatunki rzadkie
gatunki chronione
zmiany skladu gatunkowego
lata 1959-2016
biodiversity loss
ground vegetation
long−term research
protected plant species
rare plant species
red
list species
strict protection
Opis:
Changes in the herbaceous layer (vascular plants), taking place between 1959 and 2016 on the permanent study plot in the compartment 319 of the Strict Reserve in the Białowieża National Park are presented. Zaręba [1972] presented phytosociological research carried out in 1959 on the 1.2 ha plot. The author established 10 relevés (size between 100 and 400 m2), in which in total 91 different species of vascular plants were noted. In 2016, the similar study was conducted, using slightly modified methods (the inventory of plants involved the total area of the study plot). The comparison of data recorded during both investigations revealed that the total number of plant species declined from the initial 91 to current 83. During the ca. 60−year long period, 43 plant species disappeared completely and were replaced by 35 new species. In the declining group, almost the half (20) were species important from the point of view of nature conservation, including four Red List species (Arnica montana, Goodyera repens, Lathyrus laevigatus, Trolius europaeus), 10 plant species protected by law, and several other precious species related to rare and declining woodland community types. The obtained results confirm the findings of other authors describing unfavourable changes in the flora of the Białowieża Forest during the past several tens of years. The floristic richness is an important part of the overall biodiversity of Białowieża Forest. It appears that strict protection does not secure the maintenance of this key component. Thus, an attempt to preserve diverse values of Białowieża Forest on a sustainable basis should, first of all, look for a proper balance between strict and active protection. The later can (and should) be integrated within the multifunctional forest management, conducted on the prevailing area of the Białowieża Forest.
Źródło:
Sylwan; 2018, 162, 12; 980-988
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja przewozów drewna nabywanego w jednostkach Lasów Państwowych
Optimization of the transportation of wood purchased in the State Forests units
Autorzy:
Kłapeć, B.
Tracz, W.
Janeczko, K.
Powiązania:
https://bibliotekanauki.pl/articles/986951.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Panstwowe Gospodarstwo Lesne Lasy Panstwowe
drewno
transport
odleglosc przewozow
optymalizacja
programowanie liniowe
wspomaganie decyzji
timber transportation
criterion of export distance
network analysis
linear programming
decision
support
Opis:
Since many years much attention has been paid to the rationality of wood transportation criteria due to the realization of social objectives. Identification and elimination of unnecessary haulage can reduce the total cost of transport and contribute to reducing fuel consumption, carbon dioxide emissions and accident risk. This paper concerns decision support for the allocation of available wood as a lot of irrationality of the existing wood transport operations has been observed. The aim of the study was to develop and test the method of optimizing the allocation of wood available in forest districts for selected groups of customers from over the country, taking into account the criterion of export distance (geography of purchase). The scale of the effects of applying the proposed optimization method is also presented. Data on sales of medium size S2A Scots pine wood in 2015 was used. A model of a two−dimensional transport task was built in order to optimize wood allocation. The road distance between the points where the wood was loaded and the points where it is processed was determined using the transportation network and network analysis performed in ArcGIS software. Linear programming was used to develop a software to support the allocation of wood to a group of selected customers nationwide. It was assumed that the benefits of optimization would be shared by whole group and not just by each customer individually. Changing existing supply locations can significantly shorten the average transportation distances up to 31% for particular customers (tab. 2), while for the whole group of analysed customers the reduction amounted to 14%. As a result of the proposed method, the transportation work would be reduced by 65 mio m3, which would reduce the average distance of timber exports by 15 km. This allows shortening of over 174 thousand of truckloads. The savings from the shortage of truck− loads will amount to over 1.1 mio l of diesel fuel, which is worth about 5 mio PLN (1.18 mio ).
Źródło:
Sylwan; 2017, 161, 10; 842-850
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzrost i mrozoodpornosc dwuletnich sadzonek buka [Fagus sylvatica L.] wyroslych z nasion moczonych w roztworach regulatorow wzrostu
Autorzy:
Kraj, W.
Dolnicki, A.
Pilczuk, B.
Powiązania:
https://bibliotekanauki.pl/articles/814454.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wzrost roslin
buk zwyczajny
nasiona
hodowla lasu
sadzonki
mrozoodpornosc
nasiennictwo
lesnictwo
moczenie
Fagus sylvatica
regulatory wzrostu
drzewa lesne
Źródło:
Sylwan; 1995, 139, 12; 91-96
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność określania świeżej masy strzał jodły na podstawie przeliczników wagowo-objętościowych
Accuracy of estimation silver fir stem mass on the basis of volume to weight conversion factors
Autorzy:
Ochal, W.
Wertz, B.
Grabczyński, S.
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/985798.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
biomasa drzewna
masa strzaly drzew
biomasa swieza
szacowanie biomasy
wspolczynniki wagowo-objetosciowe
gestosc drewna
abies alba
wood density
stem biomass
biomass estimation
Opis:
The paper describes the accuracy of estimation of silver fir stem fresh mass on the basis of volume to weight conversion factor, derived from samples, collected from few different places along the stem. The research material contained 13 sample trees selected from homogenous 70−years old stand, situated in mountainous area of the Beskid Sądecki in Polish part of the Carpathians (S Poland). Volume over the bark of sample trees was calculated with section−wise method and the whole stem fresh biomass was directly weighted. For each sample tree three stem discs were collected at 1/6, 1/2 and 5/6 of tree height, their weight and volume were precisely determined and the biomass conversion factors (equivalent of stem density) were calculated. The assessment of the accuracy of whole fresh stem biomass was conducted according to five variants: for the biomass conversion factors derived from each individual stem disc (lower, middle or upper), from weighted mean density and on the basis of the constructed mixed model, where relative height and diameter were treated as fixed effects and influence of individual trees was included as a random term. The volume of sample fir stems ranged from 0.15 to 2.22 m3, while their fresh biomass varied between 138.1 and 1896.7 kg. Obtained results show that variation of the density was higher within stems than between them (coefficient of variation amounted to 8.4% i 3.3% respectively). The average density increased along stem, from 835.6 kg/m3 for lower part (1/6H) to 986.8 kg/m3 for the upper part (5/6H). Estimating the biomass on the basis of just lower stem disc resulted in the average relative error equal to –5.8%, while for middle stem disc the error was +1.2%, and for upper disc +11.3%. The use of conversion factors derived from weighted average density of all three stem discs resulted in average bias equal to –1,7% with standard error 1,0%. Despite the presence of mean bias of –2.3%, the constructed density model gave the most precise estimation of the stem biomass (standard error 0.7%), which indicates the reasons for its further improvements and usage.
Źródło:
Sylwan; 2018, 162, 04; 277-287
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zrywka drewna średniowymiarowego w drzewostanach trzebieżowych przy użyciu ciągnika rolniczego z przyczepą nasiębierną
Timber extraction in thinned stands using agricultural tractor coupled with a trailer with a hydraulic crane
Autorzy:
Naskrent, B.
Polowy, K.
Grzywiński, W.
Sobczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/979600.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
drzewostany przedrebne
trzebiez pozna
pozyskiwanie drewna
drewno sredniowymiarowe
zrywka drewna
zrywka nasiebierna
fotografia dnia roboczego
struktura czasu pracy
timber extraction
time studies
forest trailer
working day photography
Opis:
The amount of timber extracted from Polish forests is expected to increase in near future. The most common equipment for timber extraction is an agricultural tractor with a trailer equipped with a hydraulic crane. The research was carried out in the Wymiarki Forest District (Regional Directorate of the State Forests in Zielona Góra) in the third (TP1) and fourth age class (TP2) in Scots pine stands, during extraction of timber from thinning. Extraction was carried out using BELARUS MTZ 1221.2 agricultural tractor with PALMS 120 forest trailer equipped with PALMS 700 hydraulic crane. The scope of the study was to conduct time studies of extraction process and to estimate the extraction productivity as well as time and fuel consumption. Working time was measured by stopwatch, while the forwarding distance was determined with measuring wheel. The exact number of logs in each load was established. Average volume of each log and each load was calculated. The dominant work time category was effective working time 74.78% (TP1) and 73.60% (TP2), while the prevailing work task was loading 56.82% (TP1) and 58.99% (TP2). In older stands, the extraction productivity was higher than in younger ones reaching 11.28 and 9.62 m3/h, respectively. Statistical analysis proved that extraction distance significantly affect productivity and time consumption. With increasing extraction distance productivity decreases and time consumption increases. Fuel consumption was exactly the same in younger and older stands (0.52 l/m3).
Źródło:
Sylwan; 2019, 163, 02; 121-129
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określenie pochodzenia wyłączonych drzewostanów nasiennych sosny rychtalskiej (Pinus sylvestris L.) z wykorzystaniem markerów mikrosatelitarnych
Determination of the origin of the rychtal Scots pine (Pinus sylvestris L.) seed tree stands using microsatellite markers
Autorzy:
Wójkiewicz, B.
Żukowska, W.B.
Urbaniak, L.
Kowalczyk, J.
Litkowiec, M.
Lewandowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/985719.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
hodowla lasu
sosna zwyczajna
Pinus sylvestris
sosna rychtalska
drzewostany nasienne
pochodzenie roslin
zmiennosc genetyczna
analiza DNA
markery mikrosatelitarne
scots pine
genetic variation
gene pool
genetic structure
ssr markers
Opis:
The rychtal pine is one of the most valuable ecotypes of Scots pine (Pinus sylvestris L.) approved for the breeding purposes in Poland. However, it occupies stands typical for oaks and beeches as shown by the compatibility analysis of species composition in relation to the habitat type in which they occur. Such result raises some doubts in terms of the naturalness of the rychtal pine and calls its history and origin into question. In the present study, we used the set of nuclear microsatellite markers to characterize and compare the gene pool composition of the selected seed tree stands of the rychtal pine with 200−year−old pine trees which grow at the Syców Forest District (SW Poland). We aimed to know to what extent the set of alleles specified for the group of the oldest trees from natural habitats is represented in the younger forest tree stands of the rychtal pine. The analysis of molecular variance (AMOVA) and clustering analysis showed that the gene pool of the studied pine populations was homogenous (FST=0,02%, K=1). The parameters of genetic variation were similar for all populations except for the mean number of alleles. On average, 25 new alleles were found in two rychtal pine seed tree stands as compared to the set of alleles found in the group of old pine trees. However, all alleles defined for old pines were also present in the gene pool of younger rychtal pine forest stands. The differences in the gene pool richness result most likely from quite high differences in the number of individuals analyzed from each population. In conclusion, our results indicate the common origin of the studied Scots pine populations.
Źródło:
Sylwan; 2019, 163, 08; 637-644
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany leśnych zbiorowisk roślinnych w latach 1959-2016 na stałej powierzchni badawczej w oddziale 319 Białowieskiego Parku Narodowego
Changes of woodland plant communities during the period 1959-2016 on the permanent study plot in the compartment 319 of the Bialowieza National Park
Autorzy:
Ciurzycki, W.
Brzeziecki, B.
Zaniewski, P.T.
Keczyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/985936.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
parki narodowe
Bialowieski Park Narodowy
fitosocjologia
zbiorowiska roslinne
zbiorowiska lesne
stale powierzchnie badawcze
zespol Tilio-Carpinetum
zespol Serratulo-Pinetum
zmiany florystyczne
lata 1959-2016
community decline
floristic ordination
long−term research
serratulo−pinetum
tilio−carpinetum
strict
protection
Opis:
The long−term changes of vegetation cover at the level of woodland community taking place between 1959 and 2016 on the permanent study plot located in the compartment 319 of Białowieża National Park are discussed. In 1959 two distinctive woodland community types occurring on sample plot were distinguished: subboreal mixed pine−oak forest (Serratulo−Pinetum) and hornbeam−lime forest (Tilio−Carpinetum). The phytosociological investigations, carried out almost 60 years later, revealed that in case of both communities, significant, directional changes of their floristic composition took place. Particularly high rate of change occurred in case of the phytocoenosis representing the Serratulo−Pinetum community. In 1959 it contained a full set of characteristic plant species. During the study period, this community type representing the Vaccinio−Piceetea class, was replaced by the initial form of lime−hornbeam forest belonging to the Querco−Fagetea class. Also, in case of the previous Tilio−Carpinetum association, the significant changes in the floristic composition occurred, although not as large as in case of Serratulo−Pinetum community. 60 years ago this community type contained several plant species typical for thermophilous oak forests. Nowadays, it represents a typical form of lime−hornbeam association. The changes in both community types were mainly related to the strong expansion of lime and hornbeam, which took place during the study period and involved the whole study plot. As a result, the vegetation occurring on the study plot is much more homogenous now than it was ca. 60 years ago. The maintenance of Serratulo−Pinetum phytocoenoses distinguished by a high floristic diversity calls for active protective measures in all cases where such measures are allowed and where this community type can potentially develop.
Źródło:
Sylwan; 2018, 162, 11; 907-914
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura roczna i rzeczywisty czas pracy na stanowiskach leśniczego i podleśniczego
Annual structure and actual worktime at the forester and deputy forester workstations
Autorzy:
Grzywiński, W.
Tomczak, A.
Jelonek, T.
Burzyńska-Jędrzejczak, G.
Naskrent, B.
Powiązania:
https://bibliotekanauki.pl/articles/985711.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
stanowisko lesniczego
stanowisko podlesniczego
czas pracy
struktura czasu pracy
struktura roczna czasu pracy
rzeczywisty czas pracy
activity structure
worktime
overtime
forester
deputy forester
Opis:
The aim of the study was to recognize the annual worktime structure and the actual number of working hours at the forester and deputy forester workstations in the State Forests. The research was carried out on the sample group of 462 workers in all regional directorates of the State Forests in 62 forest districts and 242 forest ranges. The study group consisted of 21 (4.5%) forest foresters from one−man forest districts (L1), 222 (48.1%) foresters and 219 deputy foresters (47.4%) from two−men forest ranges (L2 and PDL respectively). Altogether 17 groups of activities were distinguished. The workers were studied in spring, summer, autumn, and winter. Every time the research was conducted during one full week (Monday−Sunday). In case of two−men forest districts, both workers were studied simultaneously. The measurement of timework was carried out with the specially designed mobile application LP1 operating in Android system. The duration of particular activities at L1 and L2 workstations was similar. The office work constituted most of their worktime: 109.7 minutes (22.9%) for L1 and 111.5 min (23.3%) for L2. Transportation took 80.2 and 84.8 min (17.7 and 17.6%), whereas wood sale required 69.7 and 62.8 min (14.5 and 13.1%) for L1 and L2 work stations respectively. At PDL workstation passages took 84.7 min (17.6%), wood quality inspection and registration – 65.4 min (13.6%), and office work – 60 min (12.5%). The tasks comprising preparation, harvesting and sale of raw timber took 34.9% of L1 worktime, 32.5% in case of L2 and 41.6% for PDL’s worktime. All employees devoted the least of their worktime to tasks connected with fire precautions, nature conservation, and environmental education (tab. 1). The overrunning of normative worktime was recorded at all studied workstations. The mean daily worktime for PDL amounted to 8.17 hrs, whereas for L1 and L2 it was 8.47 and 8.52 hrs respectively. Except extra working hours during the working week, the overtime during the days−off was recorded too. Most of time spent on work in such situations was recorded for L1 (1.69 hrs on average per week), while the least (0.97 hrs) for L2 workstation.
Źródło:
Sylwan; 2019, 163, 05; 355-364
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:
Alokacja nadziemnej biomasy u sosen zajmujących różne pozycje biosocjalne w drzewostanie
Aboveground biomass allocation in Scots pines of different biosocial positions in the stand
Autorzy:
Ochał, W.
Grabczyński, S.
Orzeł, S.
Wertz, B.
Socha, J.
Powiązania:
https://bibliotekanauki.pl/articles/991636.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
pozycja biosocjalna drzew
sosna zwyczajna
Pinus sylvestris
biomasa nadziemna
alokacja biomasy
scots pine
aboveground biomass
biomass allocation
biosocial class
Opis:
The aim of this study was to assess the impact of the biosocial position occupied by the tree on the amount and structure of the biomass produced. The empirical material was measurements of biomass for 63 pines (21 for each of the I, II, and III Kraft classes). The total aboveground biomass of the trees was calculated as sum of following fractions: stem wood, stem bark, living branches, dead branches, shoots, needles and cones. It has been found that with a decrease of biosocial position of tree the share of a stem increases while share of branches in the overall biomass of the tree decreases. On the other hand biosocial position does not affect significantly the share of needles, dead branches and cones.
Źródło:
Sylwan; 2013, 157, 10; 737-746
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fosforyny jako czynnik ograniczający zamieranie drobnych korzeni w drzewostanach dębowych Płyty Krotoszyńskiej
Phosphites as factor limiting the fine root damage in oak stands from Krotoszyn Plateau
Autorzy:
Oszako, T.
Nowaszewski, M.M.
Szulc, W.
Rutkowska, B.
Nowakowska, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/985975.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
dab
Quercus
choroby roslin
fytoftoroza korzeni
zamieranie debow
czynniki ograniczajace choroby roslin
fosforyny
RDLP Poznan
Plyta Krotoszynska
drzewostany debowe
opryski lotnicze
oak decline
quercus robur l.
phytophthora
phosphites
rdlp poznań
Opis:
Oak decline phenomenon has been observed in Poland in the 1980s. Especially, Krotoszyn Forest District was affected in the years 1982−1984, when oaks were dying in a mass extend causing economic and ecological problems. Twenty five years later many Phytophthora species were isolated from rhizosphere soil suggesting their important role in fine root damage. This research was focused on application of fertilisers increasing oak resistance to soil−borne pathogens. In total, 60 soil samples were collected c.a. 1 meter from trunks of oaks representing control and treated variant with Actifos® and Kalex® fertilisers. The fine root parameters (smaller than 2 mm) were evaluated with the water scanner and WinRhizo software. The same soil samples were analysed for the presence of macro− (N, P, K, Ca, Mg) and microelements (Al, Cu, Fe, Mn, Na, Zn). The use of ammonium and potassium phosphites in the form of foliar spray had a beneficial effect on the health of oak stands (Quercus robur L.) in the Krotoszyn Forest District. Three parameters: defoliation (ICP Forest), vitality according to Roloff method and synthetic index of damage were applied in order to evaluate the status of oaks health. Two aforementioned crown parameters were obtained from visual assessment from the ground, while the synthetic index of damage was calculated according to the formula developed by Dmyterko and Bruchwald. The parameters of fine roots after treatments, especially their number, length and surface improved. Trees with better quality fine roots had more chance to survive in unfavourable environmental conditions like drought. Phosphite treatments of oak stand positively influenced the chemical properties of soil, decreased acidity, but increased availability of Zn for plants, and probably reduced root damage by toxic aluminium ions. An improvement in the health of fine roots (that were saved by phosphites from damage caused by pathogenic species of Phytophthora genus present in the soil) will have a positive effect on the reconstruction of crown architecture (shoots development from dormant buds).
Źródło:
Sylwan; 2018, 162, 10; 819-827
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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