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Przymrozki wczesne i pozne na Kopciowej [Beskid Sadecki]

100%

Wilczynski S., Durlo G., Feliksik E.

Acta Agraria et Silvestria. Series Silvestris

2005

tom 43

65-76

The early and late frosts (type), ground and total (kind), at Kopciowa near Krynica are described. The variation of the beginning and end, duration, and the number of days with the light frosts of both types and kinds are analyzed. It was found that the number of the light ground and total frosts in the spring was twice as high as that in the autumn, although both seasons lasted for the same number of days. Besides, in both seasons the number of the light ground frosts was twice as high as that of the light total frosts. The light ground frosts also occurred during the summer season. No significant trend in changes of the indexes discussed was observed during 1971-2000. In 1980s there was a distinct increase of the number of days with the light ground frosts. During that period the light ground frosts began to occur earlier in the autumn and ended later in the spring. The number of days with a light frost, however, was not correlated with the length of the light frost period. It was impossible to foresee the beginning of the light total frosts on the basis of the date of the beginning of the light ground frosts. Also it was impossible to foresee the length of the light frost period in the spring on the basis of its length in the autumn, and vice versa. This also concerned the number of days with a light frost.

Wplyw spoznionych przymrozkow oraz owadow na zdrowotnosc szyszek modrzewia europejskiego Larix decidua Mill.

75%

Skrzypczynska M., Koziol M.

Acta Agraria et Silvestria. Series Silvestris

2002

tom 40

49-66

Results of the study on impact of the late ground frost on cones of Larix decidua Mill. and cono- and seminiphagous insects: Strobilomyia laricicola (Karl) and Megastigmus pictus (Först.) are given. On 120 twigs, each 1 m in length, the distance of cone from twig apex was measured. It was determined which cones were not damaged by frost, and which were dead. The data obtained were subjected to a statistical analysis using the Kolmogorov-Smirnov's test, Student's t-test and U Mann Whitney's test. No unequivocal correlation was found between position of a cone on the twig and the effect of low temperature. The late ground frost destroyed 218 cones (61,6%) of a 357 analysed. It was found that the mature cones (not destroyed by the late frost) often (56,1%) were inhabited by S. laricicola. Seeds extracted from these cones, were dissected, and it was found that seeds were infested by M. pictus. This seminiphagous insect destroyed from 0,6% to 7,2% of seeds (3,3% of 3000 analysed). The cones were collected in southern Poland from 30 larches on six localities (5 in each loc.) in a national park, seed plantations and in a managed stand during the growing season of 2001.

Ograniczanie wyników

2 Acta Agraria et Silvestria. Series Silvestris

1 Durlo G.

1 Feliksik E.

1 Koziol M.

1 Skrzypczynska M.

1 Wilczynski S.

1 2005

1 2002

Wyniki wyszukiwania

Przymrozki wczesne i pozne na Kopciowej [Beskid Sadecki]

Wplyw spoznionych przymrozkow oraz owadow na zdrowotnosc szyszek modrzewia europejskiego Larix decidua Mill.