Claim · model-written summary
Hot wet conditions under mulching accelerated decomposition of labile and persistent carbon.
- Outcome
- decomposition of both labile C (i.e., LFOC) and persistent C (i.e., HFOC)e0
- Direction
- acceleratede0
- Qualifier
- Hot and wet conditionse0
Not reportedTaxonMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValue
Verbatim
e0“Hot and wet conditions under PFM accelerated the decomposition of both labile C (i.e., LFOC) and persistent C (i.e., HFOC), as measured by CO2 efflux from the soil.”
Title
Kaiping Zhang; Zhixin Li; Yufei Li; et al. Geoderma 2023. doi:10.1016/j.geoderma.2023.116714
Other claims from this paper (19)
- Intervention effect Plastic film mulching increased soil temperature and moisture over seven years.
- Intervention effect Mulching increased maize above-ground biomass by 150%.
- Intervention effect Mulching increased maize root biomass by 108%.
- Mechanism Mulching decreased light and heavy organic carbon pools through old-carbon decomposition and inadequate new-carbon stabilization.
- Intervention effect Mulching accelerated heavy-carbon decomposition more than light-carbon decomposition.
- Intervention effect SOC decomposition Q10 remained similar with and without mulching.
- Intervention effect Nitrogen fertilization increased maize aboveground biomass by 54%.
- Intervention effect Nitrogen fertilization increased maize root biomass by 40%.
- Mechanism Control-soil microorganisms decomposed organic nitrogen because mineral nitrogen was limited and unreplenished.
- Mechanism Nitrogen fertilization increased light-carbon content primarily by reducing old-carbon decomposition.
- Intervention effect Nitrogen fertilization maintained heavy-carbon content similar to control.
- Mechanism Nitrogen fertilization accelerated old-carbon decomposition and new-carbon stabilization, yielding faster heavy-carbon turnover.
- Mechanism Nitrogen had negligible impact on SOC turnover because light and heavy carbon effects contrasted.
- Intervention effect Nitrogen fertilization reduced Q10 relative to control.
- Intervention effect Combined mulching and nitrogen accelerated heavy-carbon and SOC decomposition.
- Intervention effect Combined mulching and nitrogen had no effect on SOC, labile-carbon and persistent-carbon contents.
- Observation Seven years was insufficient to trigger SOC and heavy-carbon content responses to combined management.
- Mechanism Mulching decreased SOC content by accelerating light and heavy carbon decomposition.
- Mechanism Nitrogen maintained SOC content by inhibiting light-carbon decomposition and enhancing heavy-carbon decomposition.