Two oral presentations lately

17.04.2018 EGU 2018 follow-up at Luke (Helsinki, Kuopio)

Biogenic volatile organic compound emissions from forest floor along a fire chronosequence on permafrost in Central Siberia, Russia

Huizhong Zhang-Turpeinen

 

17.04.2018 Viikki Soil Science Seminar (Helsinki)

Fires in northern boreal forests – effects of disturbance on biogeochemistry

Kajar Köster

Our team in EGU2018

The EGU General Assembly 2018 (held in Vienna, Austria, 08.-13.04.2018) will bring together geoscientists from all over the world.

This year our team will present the following topics:

Biogenic volatile organic compound emissions from forest floor along a fire chronosequence on permafrost in Central Siberia, Russia
Huizhong Zhang-Turpeinen, Minna Kivimäenpää, Anatoly Prokushikin, Frank Berninger, Kajar Köster, and Jukka Pumpanen
Wed, 11 Apr, 17:30–19:00, Hall A, A.223

Fire caused changes in CO2 and CH4 fluxes in Siberian permafrost forests.
Egle Köster, Frank Berninger, Kajar Köster, Heidi Aaltonen, Xuan Zhou, Huizhong Zhang-Turpeinen, Anatoly Prokushkin, and Jukka Pumpanen
Wed, 11 Apr, 17:30–19:00, Hall A, A.220

Forest fires and their effect on soil carbon turnover — comparison of permafrost and non-permafrost areas from Canada
Kajar Köster, Egle Köster, Heidi Aaltonen, Xuan Zhou, Frank Berninger, and Jukka Pumpanen
Wed, 11 Apr, 17:30–19:00, Hall A, A.227

How time since last forest fire affects soil greenhouse gas (CO2, CH4 and N2O) fluxes in hemiboreal Scots pine forest fire chronosequence
Marek Metslaid, Argo Orumaa, Egle Köster, Kristi Parro, Kalev Jõgiste, Frank Berninger, Jukka Pumpanen, and Kajar Köster
Wed, 11 Apr, 17:30–19:00, Hall A, A.219

Biochar as a possible new tool for afforestation practices
Egle Köster, Jukka Pumpanen, and Kajar Köster
Thu, 12 Apr, 17:30–19:00, Hall X3, X3.47

Effects of biochar on carbon and nitrogen fluxes in boreal forest soil

New paper by Palviainen et al., 2018 is dealing with effects on biochar on C and N fluxes in boreal forest soils. The addition of biochar to soil may offer a chance to mitigate climate change by increasing soil carbon stocks, improving soil fertility and enhancing plant growth.

The results of the study indicate that wood-derived biochar amendment of 5–10 t ha−1 did not have a clear and consistent effect on soil CO2 effluxes in boreal Scots pine forests. Biochar amendment increased the soil pH but it had no significant effect on soil microbial biomass and biological N fixation at this stage. Nitrogen mineralization rates in the organic layer had a tendency to increase with the amount of added biochar, but no statistically significant effect was detected. The results suggest that biochar can be utilized to climate change mitigation and C sequestration in boreal forests without causing undesirable effects on soil microbial biomass, key N cycling processes or native soil C stocks.

Contrasting effects of reindeer grazing on CO2, CH4, and N2O fluxes originating from the northern boreal forest floor

New paper by Köster et al., 2018 assesses the influence of reindeer on the fluxes of three GHGs (CO2, CH4, N2O) in the field layer of a northern boreal forest.

We compared grazed and non‐grazed areas and linked the GHG fluxes to vegetation biomass, plant functional type, and characteristics of soil (root biomass, soil temperature, and moisture).

Our study showed that grazing significantly reduced lichen coverage and biomass. The biomass and coverage of mosses concurrently increased significantly in grazed areas. Our results indicated that grazing induced changes in vegetation composition both positively and negatively affect GHG fluxes from the forest field layer in a northern boreal forest.

Our results showed clearly higher CO2 emissions from grazed areas, and these were affected by soil temperature and lichen coverage.

Our results also clearly demonstrated that CH4 and N2O fluxes were dependent on shifts in aboveground vegetation communities. Soil temperature and moss coverage together with soil moisture explained most of the CH4 fluxes, and grazed areas consumed more CH4. Non-grazed areas with lower moss biomass were concurrently a small N2O sink.

Overall, our results show for the first time that besides influencing the CO2 fluxes from the northern boreal forest floor, reindeer grazing has an impact on the fluxes of other GHGs. Thus, reindeer may have a significant role in determining the GHG balance of northern boreal forests.

New team member!

From 1. December we have a new team member as MSc. Christine Ribeiro Moreira de Assumpção started her PhD studies in AGFOREE doctoral shool in University of Helsinki!

Christines research topic is “Short and long term effects of forest fires on soil organic matter and GHG gas fluxes in boreal forests”, and she will work in close collaboration with the Academy of Finland financed project (Academy Research Fellow project for Dr. Köster) “Short and long term effects of forest fires on the stability of carbon pools in boreal forests” (01.09.2016 – 31.08.2021).

No fire experiment in Finland

As the summer in Finland was as it was – means it was really wet and rainy summer. We were not able to arrange fire in our study area (burning experiment 2017).

Week ago we got also the information that our study areas were destroyed and we are not able to use them anyhow anymore!

Surprisingly for us, the owner of the land (Finnish Forest administration -Metsähallitus) has been doing heavy soil scarification all over the area . . .

The rest is already just history – we lost the areas with one year work (starting from planning and establishing, and finishing with measurements of one growing season), we lost a lot of equipment, as all our equipment (data loggers, thermocouples, temperature and moisture sensors, collars for gas measurements, etc.) were still on the area and were measuring, when the excavator entered . . .