Startup meeting

Successful kickoff for ForestPotential

From the left: Geir Korsvold, Lennart Noordermeer, Gunnar Austrheim, Nicholas Coops, James Speed, Kari Klanderud, Vegard Lien, Hans Fredrik Hoen, Ole Martin Bollandsås, Karen Lone, Asbjørn Aaheim

The ForestPotential project was kicked off at the RunWay confernce hotel at Gardermoen on the 22nd and 23rd of March 2018. Most of the partners were present or participating online.

In the meeting, each of the partners introduced their field of expertise and recent research activities relevant to the project. Then each work package was presented and discussed in detail. The discussions were very useful and the outlook for a fruitful cooperation to reach the project goals is promising.


Master thesis: Regional differences in recruitment, mortality and growth of pioneer trees in the treeline ecotone

Several factors are affecting the dynamics in the treeline ecotone. Both climate, herbivory and changed landuse affect recruitment, mortality and growth in this trasition zone between forest and alpine areas. In addition to that it can be challenging to quantify the effect of each factor, several local factors are in play, such as ground vegetation, micro topography, aspect etc. This master thesis uses multi-temporal observations of trees in the treeline ecotone of 35 sites distributed along  a more than 1000 km latitude gradient, to analyze regional differences in recruitment, mortallity and growth. The thesis includes analyses of the effets of climate and herbivory on the changes in the treeline ecotone. The thesis is a part of the project ForestPotential.

Master student: Kenneth Langlie Simensen.
Supervisors: Ole Martin Bollandsås, Kari Klanderud


“Changing Forest Area and Forest Productivity – Climatic and Human Causes, Effects, Monitoring Options, and Climate Mitigation Potential”

Forest at high altitude in Hedmark County, Norway

Photo: Ole Martin Bollandsås

Project summary

A changing climate affects both the growth and the potential extent of our forests. Quantification of the effects is, however, not a trivial task. Climate change involves both changes in temperature and precipitation and studies have predicted that the magnitude of these changes will vary across latitudinal and altitudinal gradients. The competitive relationships between different vegetation species are also likely to change with changes in climate. In the boreal-alpine and boreal-tundra tree line ecotones, the changes are expected to be most rapid, both because trees here to a large degree grow on their tolerance limit in terms of climatic conditions, but also because the number of grazing domestic animals have declined in the last decades. A potential increased forest area because of upwards- and northwards shifts in the tree line will have an effect on carbon sequestration, but also the albedo effect and biodiversity in the tree line ecotone. Even for the forests well below the tree line, the growth conditions will change with changes in climate. Increased productivity will have impact both on the climate mitigation potential of the forest sector as well as the sector’s economic potential.

By means of time series data of the growth of trees, both on the productive forest land and in the tree line ecotone, coupled with time series data of climate, herbivory, airborne laser scanning, imagery, and multi-spectral information, the project ForestPotential aims at answering the several important research questions. What are the relative importance of grazing and climate on recruitment and growth in the tree line ecotone, and how accurately can changes be monitored using remotely sensed data? Can bi-temporal airborne laser scanner data be used to accurately estimate forest productivity? With input from the analyses of these research questions, we will also carry out long-term, large-scale forecasts of the Norwegian forest sector, also accounting for the albedo effect and the dynamics of the forest soil carbon stocks.


Rollag: Within a 200 x 600 m area, over a ridge in Rollag municipality, detailed measurements of trees in the tree line ecotone have been carried out. The development of these trees have been followed over a period of 12 years (2006-2018). The datast will primarely be used for development of a system for monitoring the tree line ecotone using remote sensing.

The transect: This dataset consists of a corridor sampled using aiborne laser scanners (200 m wide and 1,500 km long). The transect stretches from south to north in Norway and passes many transition zones between forest and alpine areas. Field measurements of trees and surrounding vegetation, have been carried out on 36 field sites along the transect. Laser scanner data have been collected over the transect in 2006/2007 and 2012/2013. Field work efforts were carried out in 2008, 2012 og 2018. A drone was used to collect remotely sensed data for the field sites in 2018 . Together with climate data and data describing herbivore pressure, the dataset is going to be used for analyses that aim at disentangling the effects of climate and changed land use on the changes in the tree line ecotone.

Hol/Setesdal: This dataset comprise controlled experiments where the vegetation partly have been protected from herbivores, and partly not. The dataset will be used to analyze how different levels of hebivore pressure affect the etablishment of trees in the tree line ecotone.

Production forest: This dataset comprise data from several operational forest inventories in the south-eastern part of Norway. For all the different locations, inventories at two different points in time are available. This enables analyses related to potential increased growth in the lowland forest as a result of a changing cllimate.


2022.11.26: End seminar

2020.11.12: Field work – Soil Carbon

2020.03.10: Project meeting

2018.10.12: Field work in the transect complete.

2018.03.23: Successfull startup meeting.

Norwegian University of Life Sciences, Norway
Dr. Ole Martin Bollandsås
Email: olebo[at]

Prof. Erik Næsset, Prof. Terje Gobakken, Prof. Hans Fredrik Hoen, Prof. Kari Klanderud

Project partners
Center for International Climate and Environmental Research (CICERO)
Hans Asbjørn Aaheim

Norwegian University of Science and Technology (NTNU)
Prof. Gunnar Austrheim

Scientific collaborators
University of British Columbia, Canada (UBC)
Prof. Nicholas C Coops

University of Idaho, USA (UoI)
Dr. Jan Eitel

Finnish Meteorological Institute, Finland (FMI)
Prof. Jari Liski

Private sector collaborators
Viken Skog SA
Head of Dept. Svein Dypsund

Mjøsen Skog SA
Head of Dept. Geir Korsvold

Time period
2018 – 2021

Norwegian Research Council (NFR)
Norwegian University of Life Sciences (NMBU)

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