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2279 Ätnarova

PI: Ulla Nylander

Data from 2279 Ätnarova: plant and tree measurements 2006, 2010 and 2016.

heightdiameterleading shootselection system

1959 Korseleberget

PI: Ulla Nylander

Treedata from 1959 Korseleberget (P7) contorta 1983-2012.

contortadiameterheight

1470 Rödålund

PI: Ulla Nylander

Data from 1470 Rödålund (biomass sampling, plants inventory, ash content).

biomassinventoryash

Low and high nitrogen deposition rates in northern coniferous forests have different impacts on aboveground litter production, soil respiration, and soil carbon stocks

PI: Benjamin Forsmark

Nitrogen (N) deposition can change the carbon (C) sink of northern coniferous forests by changing the balance between net primary production and soil respiration. We used a field experiment in an N poor Pinus sylvestris forest where five levels of N (0, 3, 6, 12, 50 kg N ha-1 yr-1, n = 6) had been added annually for 12-13 years to investigate how litter C inputs and soil respiration, divided into its autotrophic and heterotrophic sources, respond to different rates of N input, and its subsequent effect on soil C storage. The highest N addition rate (50 kg N ha-1 yr-1) stimulated soil C accumulation in the organic layer by 22.3 kg C kg-1 N added, increased litter inputs by 46 %, and decreased soil respiration per mass unit of soil C by 31.2 %, mainly by decreasing autotrophic respiration. Lower N addition rates (≤12 kg N ha-1 yr-1) had no effect on litter inputs or soil respiration. These results support previous studies reporting on increased litter inputs coupled to impeded soil C mineralization, contributing to enhancing the soil C sink when N is supplied at high rates, but add observations for lower N addition rates more realistic for N deposition. In doing so, we show that litter production in N poor northern coniferous forests can be relatively unresponsive to low N deposition levels, that stimulation of microbial activity at low N additions are unlikely to reduce the soil C sink, and that high levels of N deposition enhance the soil C sink by increasing litter inputs and decreasing soil respiration.

carbon budgetnitrogen depositionsoil respiration

Age and Growth Development of Norway Spruce (Picea abies (L.) Karst.) In a Heterogeneous Forest In Västerbotten County

PI: Sara Jäger

This masters thesis is a collaboration between The University of Gothenburg and The Swedish University of Agricultural Sciences, SLU. The main focus during 2 semesters is to investigate the correlation between age and growth development of Norway spruce, growing in a heterogeneous forest.

climatologydendrochronologytreegrowth

Climate benefit from the afforestation of available agricultural land

PI: Reimo Lutter

According to the recent estimation for Northern Europe, about 1.8-2.6 M ha of agricultural land is available for afforestation and intensive biomass production (Rytter et al. 2016). However, the long-term effects of different species C sequestration potential are unknown on former agricultural land. For the basis of current project, the growth data was obtained from tree species (hybrid aspen, poplar, birch, spruce, larch and willow) experiments on five former agricultural sites along a latitudinal gradient in Sweden (56° to 64°N). Site index curves were calculated to predict the potential production for each tree species and different long-term scenarios were tested to investigate each species climate benefit potential on former agricultural lands. More detailed information about the experiment: Rytter, L. and Lundmark, T. 2010 Trädslagsförsök med inriktning på biomassaproduktion [Tree species trial with emphasis on biomass production]. Skogforsk, Arbetsrapport no 724, Uppsala, 24 p.

carbon sequestrationclimate changetree species

Radial distribution of deuterium in Scots pine trees

PI: Reimo Lutter

The aim of the project is to describe the radial distribution of deuterium in Scots pine tree rings in order to develop a sampling methodology in 2H2-labeled water experiments . The experiment is located in Rosinedal experimental forest where 2H2-labeled water was added to soil. Tree ring samples were collected from two trees close to the labeled area in 2019. The sampling was carried out in four different heights (ground level, 1.3m, 2.0m and from the beginning of the living crown). From each height, 16 core samples were taken around the stem. In addition, core samples were taken from coarse roots.

deuteriumScots pinetree ring