Abstract
Methane (CH4) fluxes were measured in situ monthly for two years from moderately grazed grassland situated behind the Zoology Department in the Vikram University and agricultural farm of Madhya Pradesh Oil Federation (Tilhan Sangh) situated near the kothi palace in Ujjain city. The crops grown in the agro ecosystem were Soyabean and Chick pea. The grassland harboured 18 plant species. The highest IVI was shared by Iseilema laxum (80%). Results revealed that the grassland act as sink for methane showing annual methane consumption rates (mean -11.02 kg ha-1 yr-1) while managed agricultural field is found to be a source of CH4 with annual methane emission rates (mean 5.09 kg ha-1 yr-1). Several influencing factors like soil pH, inorganic nitrogen and organic carbon were studied concomitantly with CH4 fluxes. CH4 fluxes were positively and significantly correlated with NH4 + N, NO3 - N while significant negative correlation was observed between organic matter Vs methane fluxes in both the sites. The study concludes the importance of natural system as key player to act as sink for methane. In contrast agricultural management practices favours emission of methane, the important green house gas.
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