Abstract
Aims
Root fungal relationships in forest understory may be affected by tree harvesting. Deschampsia flexuosa forms a mutualistic symbiosis with arbuscular mycorrhizal (AM) fungi functioning in nutrient uptake, and a more loose association with dark septate endophytic (DSE) fungi. We asked how harvesting affects fungal colonisations and whether DSE is more prone to change than AM.
Methods
Deschampsia flexuosa plants were sampled close to a control or a cut tree after top-canopy harvesting in a primary successional site. Colonisations were studied using light microscopy. Shoot N%, vegetation cover and soil nutrients were determined.
Results
Tree harvesting did not affect vegetation and soil parameters, except potassium (K+) increasing near cut trees. AM colonisation did not change, while DSE increased. Shoot N% increased with increasing DSE near cut trees. Hyaline septate (HSE) hyphae and soil K+ and magnesium (Mg2+) were positively correlated near control trees. Lichen cover and HSE correlated negatively.
Conclusions
DSE colonisation increased but AM did not change after harvesting. Positive correlation of DSE with shoot N% near cut trees may suggest a role for DSE in favouring plant nitrogen uptake after disturbance in an open microsite. HSE may play a role in K+ and Mg2+ uptake.
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Acknowledgements
We would like to thank the staff members of the Botanical Museum and Garden in the Biodiversity Unit of the University of Oulu for providing facilities and technical support during the experiment. Tarja Törmänen and Tuulikki Pakonen are warmly acknowledged for nutrient analysis of the samples and Maarit Kaukonen for field assistance and providing soil nutrient and vegetation data. The study was financed by the Academy of Finland (project number 138309 to AM Markkola) and the Centre for International Mobility (CIMO) to N.B.W. Hengodage. The land owner Metsähallitus is acknowledged for a permission to use the study site for the present study.
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Hengodage, N.B.W., Ruotsalainen, A.L., Markkola, A. et al. Root fungal colonisations of the understory grass Deschampsia flexuosa after top-canopy harvesting. Plant Soil 414, 171–180 (2017). https://doi.org/10.1007/s11104-016-3108-6
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DOI: https://doi.org/10.1007/s11104-016-3108-6