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[ID: 297] Gleon DOM seasons

PI: Andrew Tanentzap

Dissolved organic matter (DOM) is central to the functioning of lakes, but its molecular composition remains a “blackbox” at large spatial and temporal scales. This project aims to understand how the origin and composition of DOM varies through time using ultra-high-resolution mass spectrometry and its association with biogeochemical data collected from high-frequency sensors (e.g. dissolved oxygen, chlorophyll a, fDOM/CDOM). We are interested in collecting surface water samples at a monthly interval for 1 year from the deepest point in your study lakes. We will process all samples using a standardized protocol and make data freely available for reuse on a cloud server. Sampling will run between Jan 2021 and Dec 2021 with standardized consumables.

DOMGleonSites water

[ID: 296] 2405 Peltovaara

PI: Fredrik Sjödin

Syftet med försöket är att studera föryngringsmetoder i svåra klimatlägen. Försöket utgörs av en huvudlokal i Pelttovaara och en referenslokal i Kissavaara. Klimatmätningar har utförts i anslutning till försökslokalerna. Försöket markbereddes med harv och högläggare. Planterades med tall (3 provenienser), gran (3 provenienser), contortatall, svartgran, vitgran och rysk lärk på sydväst- och nordostsluttning samt på krönet av 478 m höga Peltovaara, på gränsen till Ätnarova försökspark. Försöket anlades av Claes Fries, Inst f Skogsskötsel, SLU Umeå.

FöryngringsmetoderKärva klimatLarix sibiricaPicea abiesPinus contortaPinus sylvestrisPlanteringS2405SvartgranSvåra klimatVitgran

[ID: 295] 1477 Flakaliden snow depth measurements

PI: Ulla Nylander

Data from snow depth measurements at Flakaliden experimental site. Measurements at three different areas: in the forest stand (on going, start 1988), close to the climate station (on going, start 2008) and in a clear-cut area (1991-1998).

clear cut areaclimate stationsnow depthforest stand

[ID: 294] Inside the black box: assessing the stability of the greenhouse gases storage in northern peatland.

PI: Audrey Campeau

Sweden is dotted with thousands of peatlands, acting as localized reservoirs of soil organic carbon and its decomposition end-products; carbon dioxide (CO2) and methane (CH4), two potent greenhouse gases (GHG). The stability of this vast GHG storage is critical to limit the current growth in atmospheric climate forcing. This project sets out to assess the stability of the GHG storage within two contrasting peatlands types, a northern poor fen (Degerö Stormyr - Sweden) and an ombrotrophic bog (Mer Bleue- Canada). This will be achieved through the use of new sensor technology, allowing to continuously measure CO2 concentrations at different depths across vertical peat profiles. The preliminary data reveals rapid sequential losses in CO2 concentrations, from the surface down to 1.5m depth at Degerö Stormyr. These losses reoccur every year at the same period, mostly in autumn, when the thermal stratification of the peat profile is removed by surface cooling. The estimated loss of CO2 from the catotelm during those events is sufficiently large to neutralize the peatland’s annual C sink. These results indicate that the hydrological and physical processes controlling the storage and transport of GHG in the catotelm have not been well understood. This raises concerns regarding the stability of the GHG storage in northern peatlands, which appear far more dynamic than currently assumed.

PeatlandsGreenhouse GasesHydrology

[ID: 292] 13780 Litter fall Svartberget

PI: Ulla Nylander

Data from 30 litter fall traps located in three stands close to Svartbergets field station. Litter fall from trap 1-18 (spruce dominated stand), trap 19-28 (pine dominated stand) and trap 29-30 (clearcut area) has in most cases been collected twice a year (spring and autumn). Litter fall from year 1984-1997 was sorted, dried and weighted by Elon Manfredsson. Dry weights digitised by Ulla Nylander. Files do not include measurements of needle lenght and calculated numbers of needles from the original forms.

dry weightlitter fallSvartberget

[ID: 290] CO2 Evasion from Ephemeral Streams 2020

PI: Kevin Bishop

Previously collected data on the chemistry of ephemeral streams collected by student interns will be analyzed to estimate the CO2 evasion. This will be the MSc thesisi of Wiktor Trojanowski at Uppsala University Dept of Earth Sciences

carbon dioxideevasionephemeral

[ID: 289] forest regeneration summer course

PI: Kristina Wallertz

The purpose of the course is to give the students insight in the complexity in forest regenerations of the modern forestry in northern Europe. New findings and insights in seedling types, planting techniques, soil scarification methods will be discussed and evaluated linked to an understanding of plant ecophysiology and soil and site factors. The purpose with the course is also to provide knowledge in design of regeneration experiments and the techniques in measurements of seedling vitality and growth. The chain of managements, from seed to established trees will also be part of the discussion.

seedlingspine weevilmineral soil

[ID: 287] Single tree ground laser scanning

PI: Ola Langvall

Laser scanning will be used to predict wood quality in a research project run by Kenneth Olofsson, SLU, Fjärranalys. Ten Scots pine trees of various sizes and quality are laser scanned from the ground and then harvested. Parameters for quality are assessed on the logs and the logs are sent for X-ray scanning at the sawmill in Fiskarheden, to get data for actual wood quality inside the tree.

wood qualityScots pineground laserX-ray

[ID: 286] Spruce root-rot ex-ray project

PI: Martin Ahlström

Three samples of rotted spruce logs are collected for ex-ray studies.


[ID: 285] Growth Trends and Site Productivity Estimation of Boreal Forests in Sweden

PI: Alex Appiah Mensah

This project investigates the time series of forest growth under changing environmental conditions in Sweden. Additionally, methods and functions for site productivity estimation are developed to aid in the selection and comparison of tree species growth rates during the stand rotation. To this regard, data from long-term experiments and sample-based national forest inventories would be key to answering questions related to the relationships between forest growth and climate, management, and biotic factors. The environmental conditions (abiotic factors) to be analyzed include temperature, precipitation, nitrogen deposition, and atmospheric carbon dioxide levels. The biotic factors include pest and diseases etc. Understanding these growth influencing factors are key to preparing boreal forests in Sweden for sustainable forest management under the uncertainties of future climate changes.

GrowthSite indexBoreal forest

[ID: 284] 1565 Korpmarken Gallring och gödsling i skiktad granskog (Adaptiva)

PI: Fredrik Sjödin

Meta data and data sampling for 1565 Korpmarken Gallring och gödsling i skiktad granskog (Adaptiva)

ccfhyggesfrittadaptivagödslinghöggallringflerskiktad granskog

[ID: 283] Hälsingfors catchment

PI: Mats Nilsson

Monitoring of several catchments at Hälsingfors