N2O flux characteristics and emission contributions of Calamagrostis angustifoliawetland during growth and non-growth seasons

Abstract

Abstract: The nitrous oxide (N₂O) flux characteristics and emission contributions of Calamagrostis angustifolia wetland in the Sanjiang Plain during growth and non-growth seasons were observed in situ with static-chamber and GC methods from May 2003 to April 2004. The range of N₂O fluxes during the growth season was 0.005-0.111 mg/(m²·h) and showed pulse emission characteristics. The lower N₂O fluxes in May were correlated with abundant precipitation, while the sharply increased fluxes in June were correlated with the thaw of frozen layers. Between July and August, the N₂O fluxes were correlated with less precipitation and greater evaporation, and in September, the flux depended on available nitrogen in the soil. Further analysis indicated that the N₂O fluxes during the growth season were significantly (P<0.01) positively correlated with 5 cm ground temperature. The range of N₂O fluxes during the non-growth season was -0.001 5-0.049 7 mg/(m²·h), presenting “absorption-emission” characteristics. Further analysis indicated that the relationship between the N₂O fluxes and atmospheric temperatures or soil thaw days was in accord with exponential model (P<0.01) indicating that, in the frozen period, temperature was still the main factor controlling microbial activity. In the thaw period, temperature and thaw of frozen layers were important for induction of the rapid increase in N₂O fluxes. In conclusion, the N₂O emission amount during growth season was 205.54 mg N₂O/m², acting as the emission “source”, while during non-growth season, it was -26.97 mg N₂O/m², the “sink”. Overall, the N₂O emission over the whole year was 178.57 mg N₂O/m², an important N₂O emission “source”.

CLC Number:

S161.2⁺1

SUN Zhi-gao, LIU Jing-shuang, YANG Ji-song, MOU Xiao-jie, WANG Ling-ling. N₂O flux characteristics and emission contributions of Calamagrostis angustifoliawetland during growth and non-growth seasons[J]. Acta Prataculturae Sinica, 2009, 18(6): 242-247.

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N₂O flux characteristics and emission contributions of Calamagrostis angustifoliawetland during growth and non-growth seasons

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