Effects of forest management on soil fungal composition

Eva-Maria Roth, Outi-Maaria Sietiö (Toimittaja), Bartosz Adamczyk (Toimittaja), Eeva-Stiina Tuittila (Toimittaja), Heljä-Sisko Helmisaari (Toimittaja), Sauli Valkonen (Toimittaja), Kristiina Karhu (Toimittaja)

Tutkimustuotos: KonferenssimateriaalitKonferenssiabstraktivertaisarvioitu


Forest management practises affect the carbon (C) dynamics and the soil microbial community of forest ecosystems. Root-associated fungi, especially ectomycorrhiza (ECM) are prominent in boreal forests and are important for accumulation and stabilization of C in the soil. An interaction between tannin-rich roots and fungal residues constitutes a pathway for stabilization of soil organic C in boreal soils. In this study, we compare two different management systems - Continuous Cover Forestry (CCF) and Rotation Forest Management (RFM) - and their effects on the fungal community composition in boreal spruce forests in order to draw conclusions regarding the potential long-term soil C storage under these management systems. RFM is characterized by even-aged stands and harvesting with clearcuts. In CCF harvests are implemented with thinnings, which leads to uneven-aged mixed species stand structures.
Our research was carried out on experimental forest plots of the Natural Resources Institute Finland in Vessari, central Finland. The stands are dominated by Norway spruce (Picea abies L) and are managed with different harvesting treatments since 1985/86. Treatments included in this study are 1) CCF, 2) RFM, 3) Clearcuts and 4) Uncut control forests. We sampled in the humus layer and in the upper mineral soil (depth 0-10 cm).
We assume that under CCF less disturbance of the fungal community, and continuous belowground C inputs as root litter and exudates will lead to higher abundance of fungi in the live belowground biomass pool and affect the fungal community composition, species richness and functionality. Our hypothesis is that CCF and control forest soils harbour a more diverse ECM community than the clearcut plots and the even-aged monoculture stands. Furthermore, we assume that in the clearcut areas saprotrophs and plant pathogens are more frequent than in forests managed with CCF as they benefit from the high amount of harvest residues. In addition, we assume that the shift in aboveground vegetation from tree dominance to herb and grass dominance due to clear-cutting affects the mycorrhizal community and shifts the dominance from ECM to arbuscular mycorrhiza, which are considered to be less efficient in building up recalcitrant C pools.
We will discuss potential effects of the forest management on soil C storage based on preliminary results of the fungal community composition, fungal necromass and the abundance of condensed tannins.
TilaJulkaistu - 19 kesäk. 2022
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