feedbacks on soil fertility and decomposition
Drivers of soil fungal communities in boreal forests.
Acta Universitatis agriculturae Sueciae, 1652-6880
Boreal forests harbour diverse fungal communities with decisive roles in decomposition and plant nutrition. Difficulties in studying soil fungi have limited knowledge about how fungal communities are shaped. The objective of this thesis was to study factors influencing soil fungal communities, aiming for increased understanding of their effect on environmental processes.
Using next generation sequencing, responses of fungal communities to their physical-chemical environment, and responses of ectomycorrhizal (ECM) fungi to logging, were investigated. In a trenching experiment, this technology, combined with measurements of decomposition and vertical nitrogen distribution, enabled evaluation of direct and indirect involvement of ECM fungi in humus decomposition.
Fungal community composition was found to be significantly related to soil fertility, with ascomycetes dominating in less fertile forests, whereas basidiomycetes increased under more fertile conditions. ECM fungi were found to more or less disappear with complete clear-cutting and reestablishment of ECM diversity took several decades. However, a clear positive relationship between the amount of retention trees and ECM fungal species richness and abundance was found. By excluding ECM fungi, nitrogen limitation of saprotrophic fungi was released, increasing litter decomposition rates. However, this effect was overshadowed by an almost complete loss of oxidative enzyme activities in deeper humus layers, associated with removal of ECM fungi by trenching.
Our results indicate ECM fungi to be the principal decomposers of boreal forest humus layers. This, together with the predictability of soil fungal communities, reinforces the importance and ability of integrating rhizosphere microorganisms, in particular ECM fungi, in forest ecosystem models.
|Title:||Drivers of soil fungal communities in boreal forests|
|Subtitle:||feedbacks on soil fertility and decomposition|
|Series/Journal:||Acta Universitatis agriculturae Sueciae (1652-6880)|
|Year of publishing :||2016|
|Depositing date:||17 February 2016|
|Number of Pages:||62|
|Place of Publication:||Uppsala|
|Publisher:||Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences|
|ISBN for printed version:||978-91-576-8550-6|
|ISBN for electronic version:||978-91-576-8551-3|
|Publication Type:||Doctoral thesis|
|Full Text Status:||Public|
|Agris subject categories.:||K Forestry > K01 Forestry - General aspects|
P Natural resources > P34 Soil biology
P Natural resources > P35 Soil fertility
|Subjects:||(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)|
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
|Agrovoc terms:||boreal forests, mycorrhizae, soil fungi, plant communities, soil fertility, ergosterol, degradation, roots, forest management|
|Keywords:||Mycorrhiza, Fungal communities, High-throughput sequencing, Ecosystem fertility, Forestry, Decomposition, Tree-retention, Gadgil effect, Ergosterol|
|Faculty:||S - Faculty of Forest Sciences|
|Department:||(NL, NJ) > Dept. of Forest Mycology and Plant Pathology|
(S) > Dept. of Forest Mycology and Plant Pathology
|External funders:||FORMAS and Skogssällskapet and Sveaskog|
|Deposited By:||Erica Sterkenburg|
|Deposited On:||19 Feb 2016 09:58|
|Metadata Last Modified:||24 Feb 2016 15:32|
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