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Organic matter priming by invasive plants depends on dominant mycorrhizal association

Title data

Kumar, Amit ; Phillips, Richard ; Scheibe, Andrea ; Klink, Saskia ; Pausch, Johanna:
Organic matter priming by invasive plants depends on dominant mycorrhizal association.
In: Soil Biology & Biochemistry. Vol. 140 (January 2020) . - No. 107645.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2019.107645

Abstract in another language

While it has long been held that invasive plants alter ecosystem processes, the magnitude and direction of these effects have rarely been quantified in situ. We measured the effects of an invasive C4 grass (Microstegium vimineum) on soil organic matter (SOM) decomposition in a deciduous forest in south-central Indiana, USA. The unique 13C signature of the C4 grass relative to the C3 trees allowed us to partition soil CO2 fluxes and estimate M. vimineum effects on decomposition. The magnitude and direction of priming effects hinged on the soil characteristics, which related to the mycorrhizal association of dominant trees. In forest plots dominated by ectomycorrhizal trees, with low nitrogen availability and most SOM in particulate (i.e., unprotected) forms, M. vimineum increased SOM decomposition by 58%. In contrast, in plots dominated by arbuscular mycorrhizal trees, characterized by high nitrogen availability and most SOM in mineral-associated (i.e., protected) forms, M. vimineum decreased decomposition by 14%. Collectively, our results demonstrate that invasive species can play a large role in altering ecosystem processes and suggest that the magnitude and direction of such effects depend on the dominant trees and edaphic characteristics of the stand.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER154210
Keywords: 13C natural abundance; CO2 emission; Flux partitioning; Microbial activation; Rhizosphere priming effects; Mycorrhizal-associated nutrient economy (MANE)
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Junior Professor Agroecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Junior Professor Agroecology > Junior Professor Agroecology - Juniorprof. Dr. Johanna Pausch
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 550 Earth sciences, geology
Date Deposited: 29 Jan 2020 06:43
Last Modified: 29 Jan 2020 06:43
URI: https://eref.uni-bayreuth.de/id/eprint/53857