Search Results - "Sikström, Ulf"

Environmental impact of mechanical site preparation on mineral soils in Sweden and Finland — a review by Ring, Eva, Sikström, Ulf

“…Mechanical site preparation (MSP) is deliberate soil disturbance which is undertaken to improve the conditions for forest regeneration. Disc trenching and…”
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Influence of mechanical site preparation on regeneration success of planted conifers in clearcuts in Fennoscandia – a review by Sikström, Ulf, Hjelm, Karin, Holt Hanssen, Kjersti, Saksa, Timo, Wallertz, Kristina

“…In the Nordic countries Finland, Norway and Sweden, the most common regeneration method is planting after clearcutting and, often, mechanical site preparation…”
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Ditch cleaning in boreal catchments: Impacts on water chemistry and dissolved greenhouse gases in runoff by Zannella, Alberto, Wallin, Marcus B., Sikström, Ulf, Arvidsson, Emeli, Eklöf, Karin

“…Ditch cleaning (DC) is a forestry practice commonly conducted in boreal regions that aim to lower groundwater tables (GWT) in waterlogged soils, thereby…”
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Growth responses of Pinus sylvestris and Picea abies after ditch cleaning - a survey in Sweden by Sikström, Ulf, Jansson, Gunnar, Pettersson, Folke

“…In drained forest sites, ditch cleaning (DC) may be needed to restore the drainage function of ditches and maintain favourable growing conditions. The main…”
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Recovery of crown transparency and stem growth of Pinus sylvestris after infestation by Gremmeniella abietina by Sikström, Ulf, Jacobson, Staffan, Pettersson, Folke

“…•Long-term dataset on G. abietina infested Scots pine trees monitored up to 13years.•Most mortality occurred within two years of the attack.•The growth…”
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Ditch network maintenance in peat-dominated boreal forests: Review and analysis of water quality management options by Nieminen, Mika, Piirainen, Sirpa, Sikström, Ulf, Löfgren, Stefan, Marttila, Hannu, Sarkkola, Sakari, Laurén, Ari, Finér, Leena

“…The objective of this study was to evaluate the potential of different water management options to mitigate sediment and nutrient exports from ditch network…”
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Is tree growth in boreal coniferous stands on mineral soils affected by the addition of wood ash? by Jacobson, Staffan, Lundström, Hagos, Nordlund, Sten, Sikström, Ulf, Pettersson, Folke

“…Increasing use of forest fuels for energy production is generating greater quantities of wood ash. In Sweden, it is recommended that this ash should be…”
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Crown transparency, tree mortality and stem growth of Pinus sylvestris, and colonization of Tomicus piniperda after an outbreak of Gremmeniella abietina by Sikström, Ulf, Jacobson, Staffan, Pettersson, Folke, Weslien, Jan

“…► We present effects of G. abietina infestation in Scots pine stands. ► Tree mortality increase substantially above a crown transparency (CT) of 85%. ► Growth…”
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Reduced global warming potential after wood ash application in drained Northern peatland forests by Rütting, Tobias, Björk, Robert G., Meyer, Astrid, Klemedtsson, Leif, Sikström, Ulf

“…•Wood ash addition to peatland forests increases C sequestration in tree biomass.•Increased tree growth decreases the GHG source strength of peatland…”
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Growth of Pinus sylvestris after the application of wood ash or P and K fertilizer to a peatland in southern Sweden by Sikström, Ulf, Almqvist, Curt, Jansson, Gunnar

“…The effects of the application of wood ash and of fertilizer regimes including phosphorus (P) and potassium (K), with and without simultaneous addition of…”
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Contrasting effects of wood ash application on microbial community structure, biomass and processes in drained forested peatlands by Björk, Robert G, Ernfors, Maria, Sikström, Ulf, Nilsson, Mats B, Andersson, Mats X, Rütting, Tobias, Klemedtsson, Leif

“…The effects of wood ash application on soil microbial processes were investigated in three drained forested peatlands, which differed in nutrient status and…”
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Interactions between soil water conditions and forest stands in boreal forests with implications for ditch network maintenance by Sikström, Ulf, Hökkä, Hannu

“…At sites with either peat or mineral soils in large areas of boreal forests, high soil-water contents hamper tree growth and drainage can significantly…”
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Initial effects of post-harvest ditch cleaning on greenhouse gas fluxes in a hemiboreal peatland forest by Tong, Cheuk Hei Marcus, Nilsson, Mats B., Sikström, Ulf, Ring, Eva, Drott, Andreas, Eklöf, Karin, Futter, Martyn N., Peacock, Mike, Segersten, Joel, Peichl, Matthias

“…•We studied ditch cleaning (DC) effects on GHG fluxes in peatland forest clear-cuts.•Delayed herbaceous plant growth after DC reduced total production and…”
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Puuston ja kasvupaikan väliset vuorovaikutukset ja niiden merkitys kunnostusojituksissa – kirjallisuuskatsaus by Ulf Sikström, Hannu Hökkä

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Water chemistry following wood-ash application to a Scots pine stand on a drained peatland in Sweden by Ring, Eva, Brömssen, Claudia von, Losjö, Katarina, Sikström, Ulf

“…The availability of phosphorus and potassium often limit growth of trees on well drained peatlands in the boreal region. Wood ash, which contains phosphorus…”
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Effects of repeated urea doses on soil chemistry and nutrient pools in a Norway spruce stand by Nohrstedt, Hans-Örjan, Jacobson, Staffan, Sikström, Ulf

“…Pools of macro-nutrients in soil and vegetation were studied in an old fertilization experiment with a large previous input of N. Different doses of N, in the…”
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Effects of previous high N addition on nutrient conditions in above-ground biomass of a Picea abies stand in Sweden by Jacobson, S, Sikstrom, U, Nohrstedt, H.O

“…Deposition of air pollutants, together with intensified harvesting practices, has led to concern about the declining base cation status and the acidifying…”
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Survival, growth and needle element concentrations of Picea abies (L.) Karst. seedlings after brash removal in a previously N fertilized stand by Sikstrom, U

“…Export of nutrients after whole-tree harvest (WTH), i.e. harvesting nearly all of the aboveground parts of the trees, may affect the long-term sustainability…”
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Reduction of greenhouse gas emissions by wood ash application to a Picea abies (L.) Karst. forest on a drained organic soil by Klemedtsson, L, Ernfors, M, Björk, R.G, Weslien, P, Rütting, T, Crill, P, Sikström, U

“…Wood ash additions of 3.3 and 6.6 t ha⁻¹ reduced greenhouse gas (GHG) emissions from a spruce forest (Picea abies) on a minerotrophic drained organic soil…”
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Pre-harvest soil acidification, liming or N fertilization did not significantly affect the survival and growth of young Norway spruce by Sikström, Ulf

“…Acidification, liming, and N fertilization affect a number of soil properties. Such changes may have an impact on forest regeneration and yield. The aim of…”
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