Shun Hasegawa
Research Scientist
Biography
I have been assigned as the head of the Norwegian National Soil Carbon Monitoring programme at NIBIO since 2023. My role is to lead, develop and execute this very first soil carbon monitoring project in Norway.
I am a climate change biologist with broad interests in the impacts of human activities and associated climate/environmental changes on global biogeochemical processes. I completed PhD at Imperial College London in 2015 with a thesis entitled Investigation into the effects of elevated carbon dioxide and temperature on nutrient cycling and understorey vegetation in a Eucalyptus woodland. My previous work can be found here.
Previous employment:
- 2022-2023 Senior Research Engineer at Umeå University with a focus on the role of root carbon supply on oxidative decomposition in the boreal soil.
- 2018-2022 Postdoc at Swedish University of Agricultural Sciences with a focus on the long-term effects of nitrogen addition on organic matter accumulation in boreal forests.
- 2017-2018 Senior research technician at National Institute for Environmental Studies of Japan with a focus on meta-analysis on microbial immobilisation.
- 2015-2017 Postdoc at Hawkesbury Institute for the Environment, Western Sydney University with a focus on the effects of elevated CO2 and water availability on soil nutrient availability in relation to root exudates.a
Authors
Shun Hasegawa Inge Stupak Kristin Baldursdóttir Hannu Ilvesniemi Carl-Fredrik Johannesson O. Janne Kjønaas Andis Lazdins Aleksi Lehtonen Jenni Nordén Ivika Ostonen David Paré Helena Marta Stefánsdóttir Johan Stendahl Iveta Varnagiryté-Kabasinskiene Lars Vesterdal Lise DalsgaardAbstract
Bakgrunn: Overvåking av karbon i skogjord gjennomføres i mange land, noe som har resultert i omfattende nasjonale datasett, også i tilfelle hvor landene har felles grenser og i stor utstrekning lignende eller tilsvarende skogs- og jordtyper. Mulighet: Internasjonalt samarbeid om data og feltmetoder kan legge til rette for integrasjon av datasett og sammenligning av overvåkingsdata til støtte for utvikling av internasjonal politikk i et multinasjonalt fremfor et nasjonalt perspektiv. Utfordring: Variasjoner i overvåkingsmetodikk mellom land må håndteres for å kunne gjennomføre en effektiv syntese av data om karbon i skogjord. Tilnærming: Hvert land har utviklet sitt eget overvåkingsprogram for å møte spesifikke og nasjonale miljømessige og institusjonelle behov, noe som har ført til omfattende datasett på nasjonalt nivå. Harmonisering kan bidra til å realisere det fulle potensialet i disse nasjonale datasettene gjennom utvikling av internasjonale referansedefinisjoner. En tilnærming med utgangspunkt i harmonisering tillater nasjonal tilpasning, samtidig med at data kan brukes i en internasjonal kontekst, i kontrast til standardisering og en «én størrelse passer alle»-tilnærming.
Authors
Shun Hasegawa Kjetil Schanke Aas Ulrika Jansson Asplund Lise Dalsgaard Heleen de Wit Andreas Hagenbo Carl-Fredrik Johannesson Jenni NordénAbstract
Norwegian forests cover 12 million hectares and are vital for carbon uptake and biodiversity, yet CO2 absorption has declined since 2010 due to increased harvesting, mortality and reduced growth as more forests surpass harvest maturity. With 45% now economically mature and 20% older than 120 years, the future carbon uptake of these stands is uncertain, particularly if they develop towards old-growth. Old-growth forests form without stand-replacing disturbances and have diverse structures and deadwood. Norwegian mature forests mostly originate from clear-cutting, so insights from primary old-growth must be applied with caution. After maturity, forests continue to sequester carbon but more slowly, with increasing storage in deadwood and soil. Soil carbon trajectories remain uncertain: disturbance often causes short-term losses followed by decades of accumulation. Microbial communities, especially fungi, influence long-term soil carbon, but data are limited. Norway uses the Yasso soil carbon model, which predicts continued soil carbon increases with age though at slowing rates; however, it simplifies key processes, and more advanced models are in development. Biodiversity supports carbon cycling, resilience and soil health, yet knowledge gaps persist. Climate change is expected to increase disturbances, raising long-term risks for older stands. The report highlights the need for improved monitoring, research and modelling to better understand carbon dynamics and resilience as forests age.
Authors
Mingkai Jiang Belinda E. Medlyn David Wårlind Jürgen Knauer Katrin Fleischer Daniel S. Goll Stefan Olin Xiaojuan Yang Lin Yu Sönke Zaehle Haicheng Zhang He Lv Kristine Y. Crous Yolima Carrillo Catriona Macdonald Ian Anderson Matthias M. Boer Mark Farrell Andrew Gherlenda Laura Castañeda-Gómez Shun Hasegawa Klaus Jarosch Paul Milham Raúl Ochoa-Hueso Varsha Pathare Johanna Pihlblad Juan Piñeiro Nevado Jeff Powell Sally A. Power Peter Reich Markus Riegler David S. Ellsworth Benjamin SmithAbstract
No abstract has been registered