Veli Pohjonen. (1974). Istutustiheyden vaikutus eräiden lyhytkiertoviljelyn puulajien ensimmäisen vuoden satoon ja pituuskasvuun. Silva Fennica vol. 8 no. 2 article id 4901. https://doi.org/10.14214/sf.a14745

English title: Effect of spacing on the first-year yield and height increment of some species undergoing short rotation culture.

Original keywords: pituuskasvu; hybridihaapa; harmaaleppä; kiiltopaju; lyhytkiertoviljely; istutustiheys; tuotto; satotaso; vesipaju

English keywords: yield; height growth; Alnus incana; Populus tremula x Populus tremuloides; Populus x wettsteinii; Salix ’Aquatica Gigantea’; Salix phylicifolia; short rotation cultivation

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The effect of spacing on the first-year yield and height increment of Alnus incana (L.) Moench, Populus tremula L. x Populus tremuloides Michx. (Populus x wettsteinii), Salix ’Aquatica Gigantea’, and Salix phylicifolia L. was studied at the Arctic Circle Agricultural Experimental Station in Northern Finland. S. ’Aquatica Gigantea’ gave yields which were twice as high as those of the other species in the study. The highest yields were of the order of 60 tons per hectare (fresh yield including foliage). The annual height growth in S. ’Aquatica Gigantea’ was about 100 cm, in the others about 30–50 cm. S. ’Aquatica Gigantea’ had a maximal height growth when the distance between the seedlings was 25 cm.

The PDF includes a summary in English.

Pohjonen, E-mail: vp@mm.unknown

article id 4871, category Article

Kari Löyttyniemi. (1972). Hybridihaavikoiden hyönteistuhoista. Silva Fennica vol. 6 no. 3 article id 4871. https://doi.org/10.14214/sf.a14678

English title: Insect damages in hybrid aspen stands.

Original keywords: hyönteistuhot; hybridihaapa

English keywords: hybrid aspen; insect damages; Populus tremula x Populus tremuloides; Saperda populnea; Saperda carcharias; Chionaspis salicis; Populus x wettsteinii

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Hybrid aspen (Populus tremula L. x Populus tremuloides Michx.) has been grown in Finland for about 20 years, and the area of the stands is currently about 400 ha. Growing is planned to be greatly expanded to grow raw material for match industry. The aim of this investigation was to study susceptibility of hybrid aspen to insect damages. Insect damages in hybrid aspen, growing in Southern Finland, were examined in 15 stands in 1972. Saperda species were observed to be the most numerous and harmful insect species. Saperda carcharias L. occurred in 26% and Saperda populnea L. in 36% off trees inspected. Mass occurrence of Chionaspis salicis L. was observed in some sample areas.

Löyttyniemi, E-mail: kl@mm.unknown

article id 4858, category Article

Tauno Kallio. (1972). Erään 10-vuotiaan hybridihaapametsikön lahovikaisuus. Silva Fennica vol. 6 no. 1 article id 4858. https://doi.org/10.14214/sf.a14661

English title: Decay in a ten-year old stand of hybrid aspen.

Original keywords: sienitaudit; laho; hybridihaapa; bakteerit

English keywords: hybrid aspen; decay; fungal diseases; bacteria; Populus tremula x Populus tremuloides

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A ten-year old stand of hybrid aspen (Populus tremula x Populus tremuloides), growing in Southern Finland on about 1.5 ha of Oxalis-Myrtillus type (OMT) soil and affected by crown blight, was examined in 1971. The study revealed that almost all trees, both those removed by thinning and the remaining growing stock, were decayed. A number of bacteria, Fungi imperfecti species and ascomycetous fungi were isolated from the discoloured heartwood of the affected trees. No fungus of the Bacidiomycetes was found in the discoloured wood material.

The PDF includes a summary in English.

Kallio, E-mail: tk@mm.unknown

Category : Research article

article id 962, category Research article

Paul A. Klockow, Anthony W. D'Amato, John B. Bradford, Shawn Fraver. (2014). Nutrient concentrations in coarse and fine woody debris of Populus tremuloides Michx.-dominated forests, northern Minnesota, USA. Silva Fennica vol. 48 no. 1 article id 962. https://doi.org/10.14214/sf.962

Keywords: coarse woody debris; fine woody debris; Populus tremuloides; nutrient concentrations; bioenergy feedstock harvesting; Great Lakes

Highlights: We examine effects of size, species, and decay on woody debris nutrient concentrations; Results indicate wide variation in nutrient concentrations across the factors examined; Fine woody debris nutrient concentrations were greater than in coarse woody debris; Coarse woody debris nutrient concentrations generally increased as decay progressed; Results suggest high fine woody debris stocks can represent an important nutrient source.

Abstract | Full text in HTML | Full text in PDF | Author Info

Contemporary forest harvesting practices, specifically harvesting woody biomass as a source of bioenergy feedstock, may remove more woody debris from a site than conventional harvesting. Woody debris, particularly smaller diameter woody debris, plays a key role in maintaining ecosystem nutrient stores following disturbance. Understanding nutrient concentrations within woody debris is necessary for assessing the long-term nutrient balance consequences of altered woody debris retention, particularly in forests slated for use as bioenergy feedstocks. Nutrient concentrations in downed woody debris of various sizes, decay classes, and species were characterized within one such forest type, Populus tremuloides Michx.-dominated forests of northern Minnesota, USA. Nutrient concentrations differed significantly between size and decay classes and generally increased as decay progressed. Fine woody debris (≤ 7.5 cm diameter) had higher nutrient concentrations than coarse woody debris (> 7.5 cm diameter) for all nutrients examined except Na and Mn, and nutrient concentrations varied among species. Concentrations of N, Mn, Al, Fe, and Zn in coarse woody debris increased between one and three orders of magnitude, while K decreased by an order of magnitude with progressing decay. The variations in nutrient concentrations observed here underscore the complexity of woody debris nutrient stores in forested ecosystems and suggest that retaining fine woody debris at harvest may provide a potentially important source of nutrients following intensive removals of bioenergy feedstocks.

Klockow, Department of Forest Resources, University of Minnesota, St. Paul, MN 55108, USA E-mail: klock039@umn.edu
D'Amato, Department of Forest Resources, University of Minnesota, St. Paul, MN 55108, USA E-mail: damato@umn.edu
Bradford, US Geological Survey, Southwest Biological Science Center, Flagstaff, AZ 86001, USA E-mail: jbradford@usgs.gov
Fraver, School of Forest Resources, University of Maine, Orono, ME 04469, USA E-mail: shawn.fraver@maine.edu

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