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Wyszukujesz frazę "Young, L." wg kryterium: Wszystkie pola


Wyświetlanie 1-4 z 4
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:
Ocena liczebności pędraków Melolonthinae w pułapkach trocinowych w uprawach sosny zwyczajnej (Pinus sylvestris L.)
Assessing the number of Melolonthinae larvae in the sawdust traps in young Scots pine (Pinus sylvestris L.) plantations
Autorzy:
Szmidla, H.
Tkaczyk, M.
Małecka, M.
Sierota, Z.
Powiązania:
https://bibliotekanauki.pl/articles/986677.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
ochrona lasu
uprawy lesne
sosna zwyczajna
Pinus sylvestris
pulapki trocinowe
szkodniki roslin
Melolonthinae
pedraki
liczebnosc
melolontha spp.
young forest plantations
root−pest monitoring
Opis:
Root−feeding insects are an increasingly studied group of herbivores, whose impact on plant productivity and are some of the most damaging forest pests in Europe. Due to the mass feeding on the roots of seedlings and older trees in young plantation and stands, Melolonthinae larvae are classified as pests, which are the most dangerous on the land dedicated to afforestation. The research was located in the Wyszków Forest District (52°43'15' N; 21°39'03' E) on the mixed coniferous and mixed deciduous forest habitats. This study evaluated sawdust traps as the method for assessing abundance of Melolonthinae larvae in Scots pine plantations established artificially from open nursery, container production, and from natural regeneration. In spring 2015 i) ‘small sawdust pits’ in rows between seedlings, and ii) pits without soil in adjacent inter−rows as control were prepared. In spring and autumn 2016, and in spring 2017 sawdust and soil from both variants of pits were sieved and Melolonthinae larvae were counted and compared. The obtained results were analyzed in two ways. The first analysis compared the occurrence of grubs in small pits with or without sawdust, while the other one analysed influence of the time of making small pits, independently for the variant with or without sawdust. The final stage was to compare the number of Melolonthinae larvae in small pits between the origin of the seedlings. We found a greater number of grubs in spring assessment than in autumn. Both kinds of small pits showed higher number of Melolonthinae larvae when compared to traditional method of ‘great pits’. The number of Melolonthinae larvae was significantly higher on the plots with container seedlings than the others. The conceptual assumptions of this alternative and environmentally safe method of ‘sawdust traps’ seems to be optimistic.
Źródło:
Sylwan; 2018, 162, 07; 590-597
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Występowanie i szkodliwość choinka szarego (Brachyderes incanus L.; Coleoptera, Curculionidae) dla sosny zwyczajnej (Pinus sylvestris L.)
Abudance and harmfulness of Brachyderes incanus L. [Coleoptera, Curculionidae] to scots pine Pinus sylvestris L.
Autorzy:
Malinowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/1018692.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wystepowanie
szkodniki roslin
choinek szary
Brachyderes incanus
sosna zwyczajna
lesnictwo
szkodliwosc gospodarcza
Pinus sylvestris
drzewa lesne
brachyderes incanus outbreak
harmfulness
young scots pine plantations
post−fire areas
Opis:
The aim of this work was to evaluate the occurrence and harmfulness of Brachyderes incanus to young Scots pine (Pinus sylvestris L.) plantations on forest areas burned during the forest fire in 1992. The development of B. incanus outbreak had place 4 to 5 years after fire and was connected with the diminishing of macronutrients content in soil. The population of B. incanus is characterised by fast increasing or decreasing the number of individuals. During two years (two generations), the number of beetles increased from 1−2 individuals/tree (at one observation) to 50−80 individuals/tree. Also during two years, the number of beetles diminished to very low level (lower than one individual/tree at one observation). The outbreak of B. incanus in the mentioned above forest areas had place in 1999−2001.
Źródło:
Sylwan; 2006, 150, 09; 46-58
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skala zniekształceń systemów korzeniowych sosny zwyczajnej Pinus sylvestris (L.) w uprawach leśnych
Range of deformation of root system in young Scots pine plantations
Autorzy:
Szewczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/990850.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
uprawy lesne
drzewa lesne
sosna zwyczajna
Pinus sylvestris
system korzeniowy
znieksztalcenia korzeni
przyczyny znieksztalcen
deformation of root system
root pathogens
scots pine plantation
Opis:
Deformation of root system as a result of root crookedness, bending or other injuries during plantation represent the main reason predestinating trees to parasitic infection. The objective of the presented work was the determination of the intensified occurrence of root deformation during tree plantation and the appearance of root pathogens. Observations were carried out on 5 sites localized in young Scots pine stands (up to 10 years old), from which 1522 samples of infected roots were collected. The obtained results confirmed that majority of trees showed deformed roots (95% represented roots with deformations). The greatest number of roots was characterized by symptoms accepted in the classification as second degree of deformation, i.e. without a visible main root and with numerous lateral roots.
Źródło:
Sylwan; 2014, 158, 10; 754-760
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
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