Results of an ecological-production research on forest ecosystems of woody plants introduced to Slovakia

Abstract

The work gives a chronological list of the results obtained in an ecological and production research on 49
coniferous and 10 broadleaved exotic woody plants in 298 parks and woody subjects across Slovakia. The
results can be used in orchard and forestry practice. Since 1971, the research has been oriented to assessment
of forest ecosystems and phytotechnique for forest stands consisting of selected exotic woody plants Pinus
nigra Arnold, Castanea sativa Mill., Quercus rubra L. and Juglans nigra L. In the area of the Little Carpathians
the best results in growth and production were achieved in Pinus nigra Arnold at the age of 100 years under
proportion rate up to 30% in the group of forest types (slt) Querceto-Fagetum (464 m 3 ha –1 ), Fagetum pauper
(463 m 3 ha –1 ) and Fageto Quercetum (432 m 3 ha –1 ). In the pure stands the highest stock was observed in the group of forest types Querceto-Fagetum (310 m 3 ha –1 ). In Castanetarium Horné Lefantovce the best results out of 86 Castanea sativa progenies were obtained in 15 progenies (Jelenec 2, Horné Lefantovce A, Tlstý
Vrch 1, 2, 2', 3, 4, 9, Duchonka 2, 3, 5, 6, 10, 12, Bratislava 4) and the worst results were obtained in seed
progenies Stredné Plachtince 5, Krná 3, Modrý Kameň 7. Following evaluation of phytotechnique impact on
production of different stand types of Castanea sativa Mill. at age of 38 years, the highest stock was observed
in mixed stands Tilia cordata Mill. (416 m 3 ha –1 , 190 t ha –1 , total production 635 m 3 ha –1 , 333 t ha –1 ). In mixed stands of Juglans nigra L. (20%) and Quercus rubra L. (80%) in the locality Ivanka pri Nitre, the highest
stock was observed at the age of 48 years (438 m 3 ha –1 , 263 t ha –1 ) and total production 662 m 3 ha –1 and 410 t ha –1 . In the locality Sikenica in pure stands of Juglans nigra L. the highest stock at the age of 64 years was
found in the stand with the strong crown thinning (464 m 3 ha –1 , 195 t ha –1 , total production 573 m 3 ha –1 and 246 t ha –1 ). In addiction to these production characteristics also leaf area indices were assessed (LAI).