Organic matter priming by invasive plants depends on dominant mycorrhizal association

Amit Kumar, Richard P. Phillips, Andrea Scheibe, Saskia Klink, Johanna Pausch

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Article number107645
JournalSoil Biology and Biochemistry
Publication statusPublished - Jan 2020
Externally publishedYes


  • C natural abundance
  • CO emission
  • Flux partitioning
  • Microbial activation
  • Mycorrhizal-associated nutrient economy (MANE)
  • Rhizosphere priming effects

ASJC Scopus subject areas

  • Microbiology
  • Soil Science


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