Claim · model-written summary
Annual mean soil N2O fluxes under the high N rate were 30% higher than under the low N rate in 2014.
- Taxon
- Switchgrass (Panicum virgatum L.)
Panicum virgatume0 - Treatment
- high N ratee1
- Outcome
- annual mean soil N2O fluxese1
- Direction
- highere1
- Value
- 30%e1
- Qualifier
- for 2014e1
- Comparator
- low N ratee1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum L.)”
e1“The annual mean soil N2O fluxes under the high N rate were 30% higher than those under the low N rate for 2014”
Title
Liming Lai Open PRAIRIE (South Dakota State University) 2017
Other claims from this paper (19)
- Intervention effect N rate did not affect soil pH, SOC or TN.
- Intervention effect N rate did not affect soil bulk density, SOC stock or P.
- Intervention effect SOC, TN and P were significantly higher at the footslope than at the shoulder and backslope.
- Intervention effect Bulk density (ρb) at the footslope was significantly lower than at the shoulder and backslope.
- Association SOC and TN values at 0- to 5-cm depth increased from 2009 to 2013.
- Association SOC at 0- to 5-cm depth was significantly influenced by year under the high and medium N rates.
- Intervention effect Average daily DOC at the backslope (6.45 mg L-1) was significantly lower than at the shoulder (8.38 mg L-1).
- Intervention effect Average daily DOC at the backslope (6.45 mg L-1) was significantly lower than at the footslope (8.95 mg L-1).
- Intervention effect Mean soil NO3 - under the high N rate (0.72 mg kg-1) was significantly lower than under the medium N rate in 2010.
- Intervention effect Mean soil NO3 - under the high N rate (0.72 mg kg-1) was significantly lower than under the low N rate in 2010.
- Intervention effect NO3 - contents under the low N rate were 68% higher than under the high N rate in 2013.
- Intervention effect Soil NO3 -, NO3 - leaching and N2O fluxes at the footslope were significantly higher than at other positions in some observed years.
- Intervention effect The medium and high N rates gave significantly higher switchgrass biomass yield than the low N rate.
- Method / resource The DAYCENT model gave satisfactory calibration and validation against measured high-frequency soil CO2 fluxes.
- Association Simulated CO2 fluxes from switchgrass land did not differ significantly among changing climate scenarios.
- Intervention effect Predicted SOC, NO3 -, CO2 and N2O fluxes at the footslope were significantly higher than at the shoulder.
- Intervention effect Predicted SOC, NO3 -, CO2 and N2O fluxes under higher N rates were higher than under the low N rate.
- Recommendation The medium N rate (56 kg N ha-1) is the optimal rate for switchgrass fields to increase biomass yield.
- Intervention effect N rate did not affect NO3 - leaching.