Andreas Hagenbo
Forsker
Biografi
I am working as a researcher within the field of land-use ecology and soil science with questions related to climate change and functioning of boreal forests, including soil carbon fluxes and storage. I have a special interest in how land-use have affects microbial processes in soil and how this feedback on ecosystem functions that drives soil carbon cycling. Much of my work focus on temporal and spatial trends in soil carbon, and I head research efforts related to the mapping of soil properties in Norway, as well the implementation and validation of soil carbon modelling methodologies.
Forfattere
Andreas Hagenbo Petra Fransson Lorenzo Menichetti Karina E. Clemmensen Madelen A. Olofsson Alf EkbladSammendrag
Summary In boreal forests, turnover of biomass and necromass of ectomycorrhizal extraradical mycelia (ERM) are important for mediating long-term carbon storage. However, ectomycorrhizal fungi are usually not considered in ecosystem models, because data for parameterization of ERM dynamics is lacking. Here, we estimated the production and turnover of ERM biomass and necromass across a hemiboreal Pinus sylvestris chronosequence aged 12 to 100 years. Biomass and necromass were quantified in sequentially harvested in-growth bags, and incubated in the soil for 1–24 month, and Bayesian calibration of mathematical models was applied to arrive at parametric estimates of ERM production and turnover rates of biomass and necromass. Steady states were predicted to be nearly reached after 160 and 390 growing season days, respectively, for biomass and necromass. The related turnover rates varied with 95% credible intervals of 1.7–6.5 and 0.3–2.5 times yr−1, with mode values of 2.9 and 0.9 times yr−1, corresponding to mean residence times of 62 and 205 growing season days. Our results highlight that turnover of necromass is one-third of biomass. This together with the variability in the estimates can be used to parameterize ecosystem models, to explicitly include ERM dynamics and its impact on mycorrhizal-derived soil carbon accumulation in boreal forests.
Sammendrag
Arealbrukssektoren (engelsk: Land Use, Land-Use Change and Forestry, LULUCF) omfatter arealbruk og arealbruksendringer, med tilhørende utslipp og opptak av CO2, CH4 (metan) og N2O (lystgass), og er en del av det nasjonale klimagassregnskapet under FNs klimakonvensjon. I oktober 2022 ble det publisert oppdaterte, nasjonale framskrivninger for sektoren (Mohr mfl. 2022), basert på data og metodikk fra Norges siste rapportering til FNs klimakonvensjon (Miljødirektoratet mfl. 2022). Som en oppfølging av det arbeidet presenteres her et utvalg sensitivitets- og usikkerhetsanalyser som illustrerer følsomheten og usikkerheten i framskrivningene for noen parametre. Dette er klima (RCP4.5 versus 8.5 og et gjennomsnitt av disse to), to utvalgte typer arealbruksendring (avskoging, og overgang fra myr og skog på organisk jord til annen arealbruk), samt inndata brukt i Yasso07.
Sammendrag
Det er ikke registrert sammendrag