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Hagenbo, A., Piñuela, Y., Castaño, C., Martínez de Aragón, J., de-Miguel, S., Alday, J. G. & Bonet, J. A. (2021). Production and turnover of mycorrhizal soil mycelium relate to variation in drought conditions in Mediterranean Pinus pinaster, Pinus sylvestris and Quercus ilex forests. New Phytologist, 230(4), 1609-1622
Åpne denne publikasjonen i ny fane eller vindu >>Production and turnover of mycorrhizal soil mycelium relate to variation in drought conditions in Mediterranean Pinus pinaster, Pinus sylvestris and Quercus ilex forests
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2021 (engelsk)Inngår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 230, nr 4, s. 1609-1622Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]
  • In forests, ectomycorrhizal mycelium is pivotal for driving soil carbon and nutrient cycles, but how ectomycorrhizal mycelial dynamics vary in ecosystems with drought periods is unknown. We quantified production and turnover of mycorrhizal mycelium in Mediterranean Pinus pinaster, Pinus sylvestris and Quercus ilex forests and related the estimates to standardized precipitation index (SPI), to study how mycelial dynamics relates to tree species and drought-moisture conditions.
  • Production and turnover of mycelium was estimated between July-February, by quantifying the fungal biomass (ergosterol) in ingrowth mesh bags and using statistical modelling. SPI for time scales of 1 to 3 months, was calculated from precipitation records and precipitation data over the study period.
  • Forests dominated by Pinus trees displayed higher biomass but were seasonally more variable, as opposed to Q. ilex forests where the mycelial biomass remained lower and stable over the season. Production and turnover respectively varied between 1.4-5.9 kg ha-1 day-1 and 7.2-9.9 times year-1 over the different forest types and were positively correlated with 2- and 3-month SPI over the study period.
  • Our results demonstrate that mycorrhizal mycelial biomass vary with season and tree species and we speculate that production and turnover are related to physiology and plant-host performance during drought.
sted, utgiver, år, opplag, sider
Wiley-Blackwell Publishing Inc., 2021
Emneord
Drought, ectomycorrhiza, extramatrical mycelium, extraradical mycelium, fungal biomass, precipitation, production, turnover
HSV kategori
Identifikatorer
urn:nbn:se:oru:diva-86787 (URN)10.1111/nph.17012 (DOI)000593642900001 ()33091152 (PubMedID)2-s2.0-85096845792 (Scopus ID)
Merknad

Funding Agencies:

Spanish Ministry of Economy and Competitivity AGL2015-66001-C3RTI2018-099315-A-I00

Spanish Government RYC-2016-20528

Tilgjengelig fra: 2020-10-26 Laget: 2020-10-26 Sist oppdatert: 2021-12-08bibliografisk kontrollert
Collado, E., Castaño, C., Antonio Bonet, J., Hagenbo, A., Martínez de Aragón, J. & de-Miguel, S. (2020). Divergent above- and below-ground responses of fungal functional groups to forest thinning. Soil Biology and Biochemistry, 150, Article ID 108010.
Åpne denne publikasjonen i ny fane eller vindu >>Divergent above- and below-ground responses of fungal functional groups to forest thinning
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2020 (engelsk)Inngår i: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 150, artikkel-id 108010Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Forest disturbances have a strong effect on soil fungal communities and associated ecosystem processes. However, little is known about the response of mycelial biomass to disturbances, and how fungi reallocate carbon into different fungal structures under environmental stressors. We investigated above- and below-ground fungal biomass shifts in response to different intensities of forest management in Mediterranean Pinus pinaster forests. Soil fungal biomass was estimated by ergosterol quantification and production of sporocarps was estimated from repeated field samplings during 5 years in 26 experimental plots. Abundance of mycorrhizal and saprotrophic fungi belowground was determined using Pacific Biosciences sequencing of fungal ITS2 amplicons. Thinning had a prolonged negative effect belowground, inter- and intra-annually, on total fungal biomass and on the biomass of ectomycorrhizal fungi, but not on saprotrophic fungi. Total and ectomycorrhizal mushroom yields were negatively correlated with the total and the ectomycorrhizal mycelial biomass, respectively. Thinning also correlated positively with the aboveground/belowground ratio of both total and ectomycorrhizal fungal biomass. We show potential short-term shifts in resource allocation of fungi from below-to above-ground structures under disturbances such as forest thinning. Ectomycorrhizal fungi may respond to disturbances by increasing reproduction rather than colonizing the surrounding soil.

sted, utgiver, år, opplag, sider
Elsevier, 2020
Emneord
Fungal dynamics, Ectomycorrhizal, Saprotrophic, Ergosterol, High throughput sequencing
HSV kategori
Identifikatorer
urn:nbn:se:oru:diva-87304 (URN)10.1016/j.soilbio.2020.108010 (DOI)000581509300009 ()2-s2.0-85091918326 (Scopus ID)
Merknad

Funding Agencies:

Spanish Ministry of Science, Innovation and Universities RTI 2018-099315-A-I00

Generalitat de Catalunya

Tilgjengelig fra: 2020-11-11 Laget: 2020-11-11 Sist oppdatert: 2020-11-11bibliografisk kontrollert
Hagenbo, A., Hadden, D., Clemmensen, K. E., Grelle, A., Manzoni, S., Mölder, M., . . . Fransson, P. (2019). Carbon use efficiency of mycorrhizal fungal mycelium increases during the growing season but decreases with forest age across a Pinus sylvestris chronosequence. Journal of Ecology, 107(6), 2808-2822
Åpne denne publikasjonen i ny fane eller vindu >>Carbon use efficiency of mycorrhizal fungal mycelium increases during the growing season but decreases with forest age across a Pinus sylvestris chronosequence
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2019 (engelsk)Inngår i: Journal of Ecology, ISSN 0022-0477, E-ISSN 1365-2745, Vol. 107, nr 6, s. 2808-2822Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In boreal forest soils, mycelium of mycorrhizal fungi is pivotal for regulating soil carbon (C) cycling and storage. The carbon use efficiency (CUE), a key parameter in C cycling models, can inform on the partitioning of C between microbial biomass, and potential soil storage, and respiration. Here, we test the dependency of mycorrhizal mycelial CUE on stand age and seasonality in managed boreal forest stands.

Based on mycelial production and respiration estimates, derived from sequentially incubated ingrowth mesh bags, we estimated CUE on an ecosystem scale during a seasonal cycle and across a chronosequence of eight, 12- to 158-year-old, managed Pinus sylvestris forest stands characterized by decreasing pH and nitrogen (N) availability with increasing age. Mycelial respiration was related to total soil respiration, and by using eddy covariance flux measurements, primary production (GPP) was estimated in the 12- and 100-year-old forests, and related to mycelial respiration and CUE.

As hypothesized, mycelial CUE decreased significantly with increasing forest age by c. 65%, supposedly related to a shift in mycorrhizal community composition and a metabolic adjustment reducing their own biomass N demand with declining soil N availability. Furthermore, mycelial CUE increased by a factor of five over the growing season; from 0.03 in May to 0.15 in November, and we propose that the seasonal change in CUE is regulated by a decrease in photosynthate production and temperature. The respiratory contribution of mycorrhizal mycelium ranged from 14% to 26% of total soil respiration, and was on average 17% across all sites and occasions.

Synthesis. Carbon is retained more efficiently in mycorrhizal mycelium late in the growing season, when fungi have access to a more balanced C and nutrient supplies. Earlier in the growing season, at maximum host plant photosynthesis, when below-ground C availability is high in relation to N, the fungi respire excess C resulting in lower mycelial carbon use efficiency (CUE). Additionally, C is retained less efficiently in mycorrhizal fungal biomass in older forest stands characterized by more nutrient depleted soils than younger forest stands.

sted, utgiver, år, opplag, sider
Blackwell Publishing, 2019
Emneord
boreal, carbon use efficiency, chronosequence, ectomycorrhizal, extraradical mycelium, mycelial biomass, mycelial respiration, soil respiration
HSV kategori
Identifikatorer
urn:nbn:se:oru:diva-77657 (URN)10.1111/1365-2745.13209 (DOI)000491025800024 ()2-s2.0-85067874959 (Scopus ID)
Tilgjengelig fra: 2019-10-30 Laget: 2019-10-30 Sist oppdatert: 2019-10-30bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-4192-0511