oru.sePublikationer
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Autotrophic and heterotrophic soil respiration: the effects of non-mycorrhizal and mycorrhizal seedlings under elevated CO2
Örebro University, School of Science and Technology. (MTM)
Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences.
Örebro University, School of Science and Technology.ORCID iD: 0000-0003-4384-5014
Örebro University, School of Science and Technology. (MTM)
(English)Manuscript (preprint) (Other academic)
National Category
Natural Sciences Environmental Sciences
Research subject
Environmental Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-11847OAI: oai:DiVA.org:oru-11847DiVA: diva2:351678
Available from: 2010-09-15 Created: 2010-09-15 Last updated: 2017-10-18Bibliographically approved
In thesis
1. Impact of root and mycorrhizal exudation on soil carbon fluxes: influence of elevated CO2 and metals
Open this publication in new window or tab >>Impact of root and mycorrhizal exudation on soil carbon fluxes: influence of elevated CO2 and metals
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The thesis concerns the behavior of root and ectomycorrhizal (ECM) exudates. In particular, the dynamics of soluble low molecular weight (LMW) organic compounds such as organic acids (LMWOAs), amino acids, monosaccharides, and dissolved organic carbon (DOC) have been studied. Our knowledge of exudation rates for tree roots and especially associated ECM is limited, and also factors influencing exudation rates. Two environmental factors, metal stress and elevated atmospheric CO2 level, have been investigated. Both are of great environmental concern, but function in different ways (detoxification and C allocation) and may be highly important for the C flux caused by root/ECM exudation. The project has been carried out with mycorrhizal and nonmycorrhizal (NM) Scots pine seedlings, or saprotrophic fungi, under both sterile and non-sterile (soil) conditions. Analytical determination of exudates and calculation of exudation rates have been major tools for assessment. Assessing the possibility of using naturally occurring chelating agents (e.g. citrate and oxalate) for bioremediation of metals contaminated soils and development and validation of analytical techniques have been additional foci. The results show that from soil-living fungi and ectomycorrhizal roots exudation rates of especially LMWOAs increase significantly at Cd and Pb stress (1-100 μM), while As (as arsenate) and mixtures of metals with As have little effect. The impact of ECM fungi is large and much higher exudation rates are found when the symbionts are present both for controls and metal treatments compared to NM plants. In soil systems there was a significant mobilization of metals from soils under presence of saprotrophic fungi. Both N as well as elevated CO2 (700 ppm) causes sizable increases in exudation rates, independent of biomass, and is a finding that suggests that the availability of easily degradable carbon in soil raises, which may be highly important for the carbon flux in soil. Mycorrhizal seedlings (10 months old) increased total soil respiration ~50% compared to controls without plants in non-sterile soil systems. Key words: amino acids, 13C, carbon cycle, ectomycorrhiza, elevated CO2, exudation, DOC, LMWOA, metal stress, monosaccharides, oxalate, Pinus sylvestris, saprotrophic fungi, soil respiration

Place, publisher, year, edition, pages
Örebro: Örebro universitet, 2009. 68 p.
Series
Örebro Studies in Environmental Science, ISSN 1650-6278 ; 14
Keyword
amino acids, 13C, carbon cycle, ectomycorrhiza, elevated CO2, exudation, DOC, LMWOA, metal stress, monosaccharides, oxalate, Pinus sylvestris, saprotrophic fungi, soil respiration
National Category
Natural Sciences Environmental Sciences
Research subject
Enviromental Science
Identifiers
urn:nbn:se:oru:diva-11848 (URN)978-91-7668-692-8 (ISBN)
Public defence
2009-11-13, Hörsal HSM, Fakultetsgatan 1, Örebro, 11:15 (English)
Opponent
Supervisors
Available from: 2010-09-15 Created: 2010-09-15 Last updated: 2017-10-18Bibliographically approved

Open Access in DiVA

No full text

Authority records BETA

Johansson, Emma M.Ekblad, Alfvan Hees, Patrick A. W.

Search in DiVA

By author/editor
Johansson, Emma M.Ekblad, Alfvan Hees, Patrick A. W.
By organisation
School of Science and Technology
Natural SciencesEnvironmental Sciences

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 266 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf