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Assessing the performance of the photo-acoustic infrared gas monitor for measuring CO2, N2O, and CH4 fluxes in two major cereal rotations

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Title Assessing the performance of the photo-acoustic infrared gas monitor for measuring CO2, N2O, and CH4 fluxes in two major cereal rotations
 
Creator Tirol-Padre, Agnes
Rai, M.
Gathala M
Sharma, S.
Kumar, V.
Sharma, Parbodh Chander
Sharma, D.K.
Wassmann, Reiner
Ladha, Jagdish Kumar
 
Subject climate
agriculture
carbon dioxide
methane
nitrous oxide
greenhouse gases
monitoring
cereals
rice
 
Description Rapid, precise, and globally comparable methods for monitoring greenhouse gas (GHG) fluxes are required for accurate GHG inventories from different cropping systems and management practices. Manual gas sampling followed by gas chromatography (GC) is widely used for measuring GHG fluxes in agricultural fields, but is laborious and time-consuming. The photo-acoustic infrared gas monitoring system (PAS) with on-line gas sampling is an attractive option, although it has not been evaluated for measuring GHG fluxes in cereals in general and rice in particular. We compared N2O, CO2, and CH4 fluxes measured by GC and PAS from agricultural fields under the rice–wheat and maize–wheat systems during the wheat (winter), and maize/rice (monsoon) seasons in Haryana, India. All the PAS readings were corrected for baseline drifts over time and PAS-CH4 (PCH4) readings in flooded rice were corrected for water vapor interferences. The PCH4 readings in ambient air increased by 2.3 ppm for every 1000 mg cm−3 increase in water vapor. The daily CO2, N2O, and CH4 fluxes measured by GC and PAS from the same chamber were not different in 93–98% of all the measurements made but the PAS exhibited greater precision for estimates of CO2 and N2O fluxes in wheat and maize, and lower precision for CH4 flux in rice, than GC. The seasonal GC- and PAS-N2O (PN2O) fluxes in wheat and maize were not different but the PAS-CO2 (PCO2) flux in wheat was 14–39% higher than that of GC. In flooded rice, the seasonal PCH4 and PN2O fluxes across N levels were higher than those of GC-CH4 and GC-N2O fluxes by about 2- and 4fold, respectively. The PAS (i) proved to be a suitable alternative to GC for N2O and CO2 flux measurements in wheat, and (ii) showed potential for obtaining accurate measurements of CH4 fluxes in flooded rice after making correction for changes in humidity.
 
Date 2014-01
2014-12-16T06:37:38Z
2014-12-16T06:37:38Z
 
Type Journal Article
 
Identifier Tirol-Padre A, Rai M, Gathala M, Sharma S, Kumar V, Sharma PC, Sharma DK, Wassmann R, Ladha JK. 2014. Assessing the performance of the photo-acoustic infrared gas monitor for measuring CO2, N2O, and CH4 fluxes in two major cereal rotations. Global Change Biology 20(1): 287–299.
1365-2486
https://hdl.handle.net/10568/52175
https://doi.org/10.1111/gcb.12347
 
Language en
 
Rights Copyrighted; all rights reserved
Open Access
 
Format p. 287-299
 
Publisher Wiley
 
Source Global Change Biology