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Large areas (up to 20%) of the Swedish forest land have been artificially drained by ditching during the past centuries to increase timber production. When these ditches age, ditch cleaning must often be conducted in order to maintain high timber productivity. For other areas no production increase has occurred. These areas have recently been suggested as potential areas for restoration to their “natural state” as wetlands, as a way to improve biodiversity and mitigate hydrological floods or droughts. This project will focus on the surface water effects of these two forest management operations, ditch cleaning (DC) and wetland restoration (WR). There is currently limited information on how DC and WR operations affects the amount and composition of terrestrial carbon (C) being exported to surface waters.
[ID: 342] Nitrogen-fixing endophytes in conifers
PI: Tinkara Bizjak
Nitrogen-fixing endophytes in conifers
[ID: 340] 1477 Flakaliden: How vulnerable is soil-stored carbon to forest dieback in fertilized and non-fertilized forests?
PI: Hyungwoo Lim
In this project, we aim to quantify a long-term legacy effect of fertilisation on carbon dynamics in response to forest dieback in a Picea abies forest in northern Sweden. Large-scale girdling13 (1000 m2, made in 2004) will be employed to mimic forest dieback induced by carbon starvation, effectively simulating a bark beetle or root rot outbreak14. Existing data and samples on soil carbon efflux and pools collected in 2004–2005, together with planned samplings this year will be used to quantify the responses. Chemical composition of soil organic matter and soil fungal community will also be examined to provide underlying mechanisms for the carbon decomposition and stock changes.
[ID: 339] ICOS
PI: Mats Nilsson
ICOS RI is a European research infrastructure, formed in 2008, with the aim to provide accessible, high-quality data to improve our understanding of greenhouse gas sinks and emissions and to contribute to measures aimed at limiting the climate impact. -- ICOS Sweden is the national contribution to the joint European effort. It operates a network of seven field stations and one station on board a commercial vessel in the Baltic sea, performing continuous measurements of carbon fluxes as well as other related variables. The mix of stations consists of six Ecosystem stations, three Atmosphere stations and two Ocean stations. SLU together with Lund University are the two largest participating universities in ICOS Sweden. Other participants are the University of Gothenburg, Uppsala University, the Polar Research Secretariat and SMHI. All stations in the national networks across Europe follow the same standardized protocols for data gathering. The measurement data are sent to central ICOS facilities where they are quality controlled and processed before being forwarded to the ICOS Carbon portal and made available to users. SLU contributes with three measuring stations within Vindelns Försöksparker. Two Ecosystem stations and one Atmosphere station. In the coniferous forest at Svartberget an Atmosphere station and an Ecosystem station are located since 2011. An Ecosystem station is also located on the mire at Degerö since 2013 . The Atmosphere station measures the amount of greenhouse gases in the atmosphere at different levels up to a height of 150 meters. The purpose of the ecosystem stations is to understand how the uptake and release of greenhouse gases, primarily carbon dioxide and methane, is affected by climate change and to understand whether the changes cause northern forests and mires to increase or counteract the greenhouse effect. At the Degerö station continuous measurements of the biosphere-atmosphere exchange of CO2 by eddy covariance started already 2001, before becoming an ICOS Ecosystem station. The site on Svartberget hosts a Class 2 combined ecosystem and Class 1 atmospheric station.
PI: Ulf Johansson
Cirkelprovyteinventeringar av praktiskt utförda gallringar i tall- och granskog på Sveaskogs kronoparker i Småland och Halland. Inventeringarna utförda 2019 och 2021. Projektet ingår i forskningsprogrammet FRAS.
[ID: 337] Long-term experimental set up for exploring global change effects on the peatland biogeochemistry.
PI: Matthias Peichl
Plot-based manipulations have been carried out since 1995 to investigate the single and interactive effects of increased nitrogen, sulfur and temperature on the peatland biogeochemistry. Since 2004, additional snow exclusion plots were established to simulate increased soil frost effects on various biogeochemical processes. Thus, this unique series of long-term manipulations addresses the consequences from several key global change issues on e.g. the greenhouse gas balance, vegetation dynamics and soil microbial communities in northern peatlands.
PI: Maria Myrstener
This project aims to evaluate downstream propagation of clear cut effects with a focus on metabolic rates. We ask whether physical and chemical effects on metabolic rates within clear cuts are propagated to downstream forest streams. We also evaluate whether larger buffer zones within clear cuts can mitigate downstream propagation of clear cut effects.
[ID: 335] Eddy Mercury – Utilizing novel eddy covariance technique to quantify Hg flux from the boreal landscapes
PI: Haijun Peng
We will conduct a study on (1) Hg(0) flux measurements on the two peatlands (Hälsingfors and Degerö) using the direct non-intrusive using advanced Hg(0) Eddy Covariance Technique, (2) ambient air Hg(II) concentration measurements using membrane method, (3) measurements of Hg wet deposition via precipitation. These measurements will allow us to elucidate the pathways in which atmospheric Hg species enter the boreal forest ecosystem and to quantify the magnitudes of Hg deposition for the individual pathways.
[ID: 333] Marteloscopes
PI: Kim Lindgren
Marteloscopes are specialised forest stands roughly 10000m² in size where each tree has been extensively measured with the intention to hold field exercises in thinning. Students/visitors select trees for thinning and/or trees that they wish to benefit through thinning and the impact on the stand can then be assessed instantly by comparing with measured data. This project aims to establish one or several Marteloscopes. A specialized software for Android and iOS-devices will be developed in connection with Silvaboreal for distributing and performing field exercises.
[ID: 332] Demonstrational buffer area – Krycklan 1
PI: Lenka Kuglerova
The purpose of this demonstration area is to test whether a hydrological adapted buffer, combined with selective logging, can promote recovery of a riparian forest from historical legacy of rotation forestry. The main aim is to promote the growth of deciduous trees through selective logging and creation of canopy gaps, promoting deadwood recruitment and helping to develop a multistory canopy. At the same time, no harmful effects on water quality and aquatic and riparian ecology should be observed in addition to avoiding excessive windthrow. We are also interested whether the operations within the buffer can be accomplished with reasonable costs. A hydrologically adapted riparian buffer will be created in the clearcut below site 1 (C1) of the long-term Krycklan Catchment Study area. The buffer is divided into seven sections where the forest operations, volume of remaining trees, number of high stumps and width of the buffer are adapted to the soil hydrology of the specific section. The area will allow for field excursions to demonstrate these new practices and results. The before and after comparative design will allow for observation of change. This site is a part of planned larger project where a network of demonstration areas will test novel designs of riparian buffers.
[ID: 331] Ask och alm inventering
PI: Åke Olson
Projektet vid Institutionen för skoglig mykologi och växtpatologi, SLU, Uppsala, syftar till att bevara skogs- och kulturträden, ask och alm. Första steget är att genomföra inventeringar av bestånd och träd i södra Sverige för att leta efter sjukdomsresistenta träd i naturreservat och andra områden.