Claim · model-written summary
Soil nitrogen availability was strongly negatively correlated with substrate-induced respiration.
- Taxon
- D. caespitosae1
- Outcome
- N availabilitye0
- Direction
- negativee0
- Setting
- substrate‐induced soil respiratione0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorValueQualifier
Verbatim
e0“there was a strong negative correlation between N availability and substrate‐induced soil respiration.”
e1“Using two species that co‐dominate alpine moist meadows as a model system (the phenolic‐rich forb Geum rossii , and the fast‐growing grass Deschampsia caespitosa ), we asked whether C from G. rossii fine roots could reduce D. caespitosa growth. We hypothesized that root C would indirectly reduce D. caespitosa growth by stimulating soil microbes, thus restricting plant N supplies. We predicted that this effect could be overcome by fertilization with N. We also hypothesized that G. rossii root phenolics could allelopathically inhibit D. caespitosa growth, and we predicted that direct, allelopathic inhibition would not be reversible with N additions.”
Title
Courtney L. Meier; Kaleb Keyserling; William D. Bowman Journal of Ecology 2009. doi:10.1111/j.1365-2745.2009.01537.x
Other claims from this paper (7)
- Intervention effect Cellulose root carbon inhibited Deschampsia growth relative to controls.
- Intervention effect Phenolic-rich root carbon inhibited Deschampsia growth relative to controls.
- Intervention effect Nitrogen addition reversed cellulose-mediated growth inhibition.
- Intervention effect Nitrogen addition did not reverse phenolic-rich carbon growth inhibition.
- Intervention effect Both carbon additions reduced soil nitrogen availability.
- Mechanism Root carbon likely reduced growth through microbial restriction of plant nitrogen supply.
- Mechanism A nitrogen-independent mechanism possibly involving Geum phenolics inhibited Deschampsia roots.