Aboveground biomass production in black walnut (Juglans nigra L.) monocultures in dependence on leaf area index (LAI) and climatic conditions
2009
Tokár, F., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Forest Ecology
The work evaluates the development of mass production of aboveground biomass in dependence on leaf area index and climatic conditions in homogeneous monocultures of black walnut (Juglans nigra L.) tended by thinning from above. The experiment was carried out in 1978-2003, in the locality Sikenica (Forest Enterprise Levice, Forest District Levice) on three permanent research plots (PRP) at age of 64 years (2003) with growing stock of 173.61-207.56 t per ha and LAI 6.54-7.82 ha per ha. Maximum mean periodical increments per LAI were reached in 1979-1983 (1.28-1.67 g per square dm per year) and in 1984-1988 (1.66-2.11 g per square dm per year), with mean annual temperature 9.5-10.0 deg C, total annual precipitation 505 mm and mean annual photosynthetically active radiation 545-572 kWh per square m. These conditions represented an optimum forest environment for reaching maximum production of aboveground biomass in homogeneous stands of black walnut in floodplain forests of the Hron River.
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