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The Relevance of Soil N2O Emissions Measured by a Closed Chamber Technique on the Physico-chemical Soil Parameters  

Kim Deug-Soo (군산대학교 토목환경공학부 환경공학전공 대기환경연구실)
Oh Jin Man (군산대학교 토목환경공학부 환경공학전공 대기환경연구실)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.20, no.6, 2004 , pp. 749-758 More about this Journal
Abstract
Nitrous oxide ($N_2$O) has been known as an important trace gas due to the greenhouse gas and the major source of stratospheric oxide of nitrogen (NO). Soil is the major source of $N_2$O in nature. The physicochemical characteristics of soils affect the emission of $N_2$O from soil. These physicochemical parameters are soil moisture, soil temperature, and soil N content. Since these parameters are correlated to the flux of $N_2$O from soil individually and compositely, there still remain many unknowns in the mechanism to produce $N_2$O in soil and the roles of such physicochemical parameters which affect the soil $N_2$O emission. Soil $N_2$O fluxes were measured at different levels in water filled pore space (WFPS), soil temperature and soil N contents from the same amounts of soils which were sampled from agriculturally managed upland field in a depth of ～30 cm at Kunsan. The soil $N_2$O flux measurements were conducted in a laboratory with a closed flux chamber system. The optimum soil moisture and soil temperature were observed at 60% of WFPS and ～13$^{\circ}C$. The soil $N_2$O flux increased as soil N contents increases during the whole experimental hours (up to 48 hours). However, average $N_2$O flux decreased after ～30 hours when organic carbon was mixed with nitrogen in the sample soils. It is suggested that organic carbon could be important for the emission of $N_2$O, and that the ratio of N to C needs to be identified in the process of $N_2$O soil emission.
Keywords
Soil $N_2O$ emission; Soil flux; Nitrous oxide; Soil flux measurements; Closed chamber;
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