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Tytuł:
Wpływ głębokości zaburzenia na liczbę gatunków szkodników sosny pospolitej (Pinus sylvestris L.) oraz ich liczebność w borach północno-wschodniego Kazachstanu
Influence of the disturbance depth on the number of Pinus sylvestris L. pest species and their abundance in the forests of north-eastern Kazakhstan
Autorzy:
Mussayeva, B.
Mokrzycki, T.
Sarsekova, D.
Osserkhan, B.
Powiązania:
https://bibliotekanauki.pl/articles/985749.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Kazachstan
drzewostany sosnowe
zagrozenia drzewostanow
pozary lasow
huragany
drzewostany uszkodzone
sosna zwyczajna
Pinus sylvestris
szkodniki roslin
szkodniki pierwotne
szkodniki wtorne
wystepowanie
primary insect pests
secondary insect pests
scots pine
kazakhstan
Opis:
The research was carried out in the economic and natural Forest Reserve ‘Yertys Ormany’ in Pavlodarsk Oblast (Kazakhstan) in 2018. In the middle of May, two barrier traps of the ‘Netocia’ type (30, in total) were installed on each research plot damaged by wind, fire and great pine web – spinning pine sawfly – Acantholyda posticalis Mats. Insects were caught every month, from mid−June to mid−August. 1521 insects belonging to 67 species and 23 families were caught in the traps. Beetles clearly dominated. We also observed a great pine web and sirex woodwasp Sirex noctilio Fabr. Of the beetles caught, 10% were thermophilic jewel beetles or metallic wood−boring beetles Buprestidae, among which Chalcophora mariana (L.) dominated. The highest average number of individuals was observed on sites damaged by A. posticalis, however, differences between the plots turned to be insignificant. The highest significant average number of species was observed on sites damaged by the fire and by the wind. The GLM analysis indicated the highest mean values of the Margalef index in plots damaged by fire and by the wind, but did not show significant differences between the average values of the fidelity index of the assemblages. The research confirmed the hypothesis of a greater number of species and individuals, and a higher diversity of pests in pine stands more strongly disturbed (i.e. damaged by the fire and by the wind). At the same time, there were no differences between the most seriously disturbed variants.
Źródło:
Sylwan; 2019, 163, 12; 1035-1042
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozmieszczenie zimujących stadiów przedimaginalnych osnui gwiaździstej Acantholyda posticalis Mats. w drzewostanach sosnowych będących ogniskami gradacyjnymi szkodnika
Distribution of wintering pre-imaginal stages of the great web-spinning pine sawfly Acantholyda posticalis Mats. in Scots pine stands being the outbreak centres
Autorzy:
Sławski, M.
Mokrzycki, T.
Perliński, S.
Rutkiewicz, A.
Sławska, M.
Powiązania:
https://bibliotekanauki.pl/articles/980205.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
szkodniki roslin
osnuja gwiazdzista
Acantholyda posticalis
larwy zimujace
eonimfy
pronimfy
rozmieszczenie przestrzenne
autumn survey
scots pine pests
eonymphae
pronymphae
abundance
distribution variability
Opis:
Acantholyda posticalis Mats. for over twenty years increases the extent of occurrence and causes defoliation of Scots pine stands. The population size is estimated annually based on the autumn surveys of phytophagous insects, but accuracy of these prognoses is far from satisfactory. The aim of the study was to describe the spatial distribution of pre−imaginal stages of A. posticalis wintering in the litter and soil to improve the methods of survey currently applied in Polish forestry. The research was carried out in four forest district located in different regions of Poland. In each forest stand three following zones were outlined: the belt of trees on the edge of the stand adjoining to young plantation or thicket, the belt 15−20 m from the stand edge and the belt in the forest interior at least 30−40 m from the edge of a stand. 152 trees were examined and 1540 plots of size 1×0.5 m were established under their canopy. The pre−imaginal stages were searched within each of these plots in the litter and soil to the depth of 20 cm. Later on they were divided into eonymphae and pronymphae, and counted. The significant differences in number of pre−imaginal stages of A. posticalis between studied forest stands in different forest districts were found. The spatial distribution of larvae wintering in the litter and soil was highly variable in scale of both stand and single tree. The abundance of larvae depended on the distance from the forest edge, but the values of this parameter calculated for trees in the same zone also varied substantially. The lowest mean abundance of pre−imaginal stages of A. posticalis denoted under pines growing at the edges of trees stand. Within the canopy projection on forest floor, the distribution of larvae was significantly dependent on the distance from the tree trunk. The highest abundance was observed within one meter from the trunk. The survey method currently used for primary pine pest assessment in Polish forests bases on ten plots and five of them are located 1.5 m from the tree trunk. In the light of presented results, the assessment of A. posticalis number could be inaccurate, because half of these plots in which scrutiny of litter and soil take place, omit the areas of higher concentration of wintering stages of the pest.
Źródło:
Sylwan; 2019, 163, 07; 556-563
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
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