Lise Dalsgaard

• Doctor of Philosophy
• Norwegian Institute of Bioeconomy Research

Nordic and Canadian forests store substantial amounts of carbon (C) and are largely managed in a silvicultural system with clear-cut harvest. Previous meta-analyses of harvesting effects on soil C have shown short- to long-term declines after harvest, but effects of clear-cutting on boreal and northern temperate forest soil C stocks remain unresolv...

We compiled published peer-reviewed CO2, CH4, and N2O data on managed drained organic forest soils in boreal and temperate zones to revisit the current Tier 1 default emission factors (EFs) provided in the IPCC (2014) Wetlands Supplement: to see whether their uncertainty may be reduced; to evaluate possibilities for breaking the broad categories us...

We compiled published peer-reviewed CO2, CH4 and N2O data on drained organic forest soils in boreal and temperate zones, to revisit the current Tier 1 default emission factors (EFs) provided in the IPCC (2014) Wetlands Supplement: to see whether their uncertainty may be reduced, to evaluate possibilities for breaking the broad categories used for t...

Policy brief describing our test work with methods for assessment of inherent soil quality, i.e. particle size determination and nutrient release capability by soil extraction using dilute nitric acid. Soil properties emanating from parent material composition and pedological processes come are both important and should be quantified.

As a carbon dioxide removal measure, the Norwegian government is currently considering a policy of large‐scale planting of spruce (Picea abies (L) H. Karst) on lands in various states of natural transition to a forest dominated by deciduous broadleaved tree species. Given the aspiration to bring emissions on balance with removals in the latter half...

Norways 2020 GHG National Inventory Report can be found here: https://unfccc.int/documents/215704 Norways 2020 GHG emission dataset can be found here: https://unfccc.int/documents/215352

Drained organic forest soils in boreal and temperate climate zones are believed to be significant sources of the greenhouse gases (GHGs) carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), but the annual fluxes are still highly uncertain. Drained organic soils exemplify systems where many studies are still carried out with relatively small...

Drained organic forest soils in boreal and temperate climate zones are believed to be significant sources of the greenhouse gases (GHG) carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), but the annual fluxes are still highly uncertain. Drained organic soils exemplify systems where many studies are still carried out with relatively small...

Biodiversity of ecosystems is an important driver for the supply of ecosystem services to people. Soils often have a larger biodiversity per unit surface area than what can be observed aboveground. Here, we present what is to our knowledge the most extensive literature-based key-word assessment of the existing information about the relationships be...

I henhold til det Norske klimagassregnskap leder avskoging til en betydelig del av de nasjonale klimagassutslipp. Målet med denne rapporten er en kartlegging av størrelse og årsaker til avskoging som kan forbedre forståelsen av avskogingsprosesser, og på sikt kan være et første steg for å redusere utslippene fra avskogingen. I Kyotoprotokollen er a...

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Soil organic carbon (C), accumulated over millennia, comprise more than half of the C stored in boreal and temperate forest landscapes. We used the Norwegian national forest inventory and soil survey network (n = 719, no deep organic soils) to explore the validity of a deterministic model representation of this pool (Yasso07). We statistically comp...

Meeting of the Austrian Society of Plant Biology (ATSPB), Berchtesgaden, Germany, May 26-28. In: Proceedings of the 21. Tagung der Austrian Society of Plant Biology (ATSPB), p. 72.

Top dieback in 40–60 years old forest stands of Norway spruce [Picea abies (L.) Karst.] in southern Norway is supposed to be associated with climatic extremes. Our intention was to learn more about the processes related to top dieback and in particular about the plasticity of possible predisposing factors. We aimed at (i) developing proxies for P50...

Mean monthly temperature (A), precipitation (B) and daily water deficit during the vegetation period (May–September) of years 1989–2010. Bars represent mean values for Sande and Hoxmark.

Information on the origin of the wood beam sample set for calculation of P50 and anatomical proxies from the SilviScan data set (n = 19) of 12 trees, where six trees were healthy looking and six trees showed signs of top dieback.

Mean monthly precipitation and daily water deficit from 1957 to 2015 of Sande and Hoxmark sites (gray areas or bars). Red lines indicate the year 1992, where early summer was extremely dry, blue lines indicate the extremely wet year 2007.

Relationships between soil C and N stocks and soil formation, climate, and vegetation were investigated in a gridded database connected to the National Forest Inventory in Norway. For mineral soil orders, C and N stocks were estimated to be 11.1–19.3 kg C·m⁻² and 0.41–0.78 kg N·m⁻², respectively, declining in the following order: Gleysols > Podzols...

The present study aims to develop biologically sound and parsimonious site index models for Norway to predict changes in site index (SI) under different climatic conditions. The models are constructed using data from the Norwegian National Forest Inventory and climate data from the Norwegian meteorological institute. Site index was modeled using th...

Boreal forests contain 30% of the global forest carbon with the majority residing in soils. While challenging to quantify, soil carbon changes comprise a significant, and potentially increasing, part of the terrestrial carbon cycle. Thus, their estimation is important when designing forest-based climate change mitigation strategies and soil carbon...

p style="text-align: justify;">There is evidence that recently occurring top dieback of Norway spruce ( Piceaabies (L.) Karst.) treesin southern Norway is associated with drought stress. We comparedfunctional wood traits of20 healthy looking trees and 20 trees with visual signs of top dieback. SilviScan technology was applied to measure cell dimens...

Northern landscapes accumulate carbon in vegetation and soils while rivers transport significant amounts of land-derived carbon to coastal areas. Here, we quantify carbon sources and sinks in main ecosystems (forests, peatlands, mountains, agricultural areas, lakes) in Norway for 1990–2008, and compare riverine carbon transport with terrestrial car...

We linked hydraulic vulnerability in Norway spruce (Picea abies (L.) Karst.) trunkwood with different cambial age to wood density and applied the findings on annual density variations in healthy and declining trees from southern Norway during 1990 to 2010. We hypothesized that drought stress due to the 2003 or 2006 European heat waves were the trig...

Within the framework of the COST Action FP0803 'Belowground carbon turnover in European forests' several conferences, workshops and Training Schools were held during the period of 2009 and 2013. The first conference was held at our Institute, WSL, in Birmensdorf (Switzerland), as the first event of the COST Action following the kick-off meeting in...

The land sink for atmospheric CO2 in northern landscapes is significant but its size and future strength is debated. Aquatic export of C, often disregarded in terrestrial C sinks estimates, can be significant. Here, we quantify C stocks and sinks in main land cover categories in Norway for 1990-2008, and evaluate the relative importance of terrestr...

Aims Beech (Fagus sylvatica L.) is an important species in natural and managed forests in Europe. This drought-sensitive species dominates even-aged stands as well more natural stands composed of a mixture of tree species, age and size classes. This study evaluates the extent that heterogeneity in spacing and tree diameter affect the seasonal avail...

Soil moisture availabilities in European forest ecosystems are varying within the seasonal cycle. Under climate warming, altered precipitation patterns as well as increased temperatures are predicted to result in more frequent or prolonged summer droughts and more severe floods. This review addresses the impact of soil water deficit or excess on so...

A renewed interest in natural gap dynamics has developed from a recent focus on sustainable forestry in Europe. To improve our understanding of the role of a canopy opening on the physical environment in a natural forest, a case study was undertaken in and around a gap in a semi-natural, beech-dominated (Fagus sylvatica L.) forest. Spatial and temp...