ECOLOGY, PHYTOTECHNICS AND PRODUCTION OF BLACK WALNUT (Juglans nigra L.) PLANTATIONS

摘要

Tokar F., Kukla J.: Ecology, phytotechnics and production of black walnut (Juglans nigra L.)plantations. Ekologia (Bratislava), Vol. 28, No. 4, p. 376-388, 2009. Impact of ecological conditions and different phytotechnics (moderate crown thinning – PRP III,and heavy crown thinning – PRP IV, with positive selection and interval of 10 years) on growthand aboveground dendromass production of black walnut plantations on the series of permanentresearch plots Sikenica (Forest Enterprise Levice, Forest District Levice) was evaluated over theperiod 1978-2003. The walnut forests of seed origin were established in the segment of the foresttype 954 Dry elm-ash forest with hornbeam belonging to heminitrophilous group of forest typesUlmeto-Fraxinetum carpineum. The Eutri-Fluvic Cambisol was formed from brown Holocenealluvial sediments. The black walnut (Juglans nigra L.) aged 64 years had the following values ofparameters: basal area 31.03 m~2.ha~(-1), aboveground dendromass 463.88 m~3.1)4.98 tha~(-1)). Themean annual periodical increment in basal area was 0.51 m~2.ha~(-1),in aboveground dendromass 11.48m3.ha~(-1) (5.39 t.ha~(-1)). Development of the average stem, basal area and aboveground dendromasswas more influenced by heavy crown thinning.