Coupling of N2O and CO2 fluxes from agriculture in Michigan

M. Cui, J. Tang, M. G. Hastings, I. Gelfand, L. Tao, K. Sun

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

CO2 has been known to cause global warming, and N2O is the largest contributor to the greenhouse gas burden of cropping systems in the United States due to application of fertilizer. In our study, fluxes of N2O and CO2 were measured at two maize fields and one reference grassland from Kellogg Biological Station in Southwest Michigan. Here we compared two measuring systems, traditional GC method and LGR/Li-Corsystem. Our initial results show that the two measuring systems are consistent (N2O slope=0.96, R2=0.96; and CO2 slope= 1.03, R2=0.86 measuring from the same chamber). Measurements done in pairs of chambers suggest great spatial variations, despite that the chambers were only0.5 meter apart. The two systems are still comparable by averaging 8pairs of chambers distributed within one site. Increase of CO2 fluxes were observed the second day after fertilization, but no significant change of N2O fluxes was shown. After artificial rainfall, boosting N2O fluxes and further increase in CO2 fluxes were demonstrated. Our result indicates that precipitation is necessary before a prominent N2O peak. In our LGR/Li-Cor system, CO was also measured from chambers. Interesting CO fluxes were shown in our experiment. Soil, which is usually considered as a CO sink, emits CO in some chambers during our measurement, which is probably related to the nationwide forest firesand lack of precipitation during the period.
Original languageEnglish
Title of host publicationAmerican Geophysical Union, Fall Meeting 2015
Subtitle of host publicationAmerican Geophysical Union, Fall Meeting 2015
Volume53
StatePublished - 1 Dec 2012
Externally publishedYes

Keywords

  • 0402 BIOGEOSCIENCES / Agricultural systems
  • 0428 BIOGEOSCIENCES / Carbon cycling
  • 0469 BIOGEOSCIENCES / Nitrogen cycling

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