Characteristics of N2O flux in Phragrmites australis wetland affected by tides and weeds wetland without flooding perennial in the Dagu river estuary of Jiaozhou Bay in autumn and winter were observed using a static chamber and gas chromatograph technique from September 2009 to February 2010. N2O emission and absorption of the two types of wetlands have a significant diurnal variation. Day maximums occurred at 12 o'clock and 21 o'clock, and the minimum value were usually at about 6 o'clock in the morning. The maximum values in Phragrmites australis wetland and weeds wetland were 151.1μg/(m2·h), 29.3μg/(m2·h) and the minimum values were-128.9μg/(m2·h) and-21.5μg/(m2·h), respectively. N2O flux in Phragrmites australis wetland in autumn and winter during the day time was 1.54 and 2.09 times as much as that in the night, respectively. And there were more N2O fluxes from weeds wetland in the day than during the night in autumn, just the opposite for winter. The highest monthly emissions of N2O in Phragrmites australis wetland and weeds wetland were 42.42 mg/m2, 6.89 mg/m2 and they were observed in November. Monthly N2O fluxes in Phragrmites australis wetland were more than weeds wetland. Seasonal N2O emissions in autumn and winter were 56.32 mg/m2and 63.38 mg/m2 in Phragrmites australis wetland, and 10.45 mg/m2 and 3.08 mg/m2 in weeds wetland, respectively. N2O flux from weeds wetland in autumn and winter was 5.39 and 20.58 times as much as that from Phragrmites australis wetland which caused by different hydrologic characteristics of wetlands and the different types of vegetation. Further analysis indicated that N2O fluxes in weeds wetland in autumn and winter were significantly positively correlated with 5cm, 10cm ground temperature(P<0.05). The relation between N2O fluxes in Phragrmites australis wetland and 5cm,10cm ground temperature was not significantly, N2O emission and absorption in Phragrmites australis wetland was influenced largely by the tides. In addition to affected by temperature at monitoring sites, the process of alternating wet and dry, water level, salinity and tidal effected the emissions and absorption of N2O greatly. In autumn and winter, Phragrmites australis wetland and weeds wetland in the Dagu river estuary of Jiaozhou Bay were the "source"of atmospheric N2O.
XIE Wen-xia, ZHAO Quan-sheng, ZHAG Fang, MA Xiao-fei
. Characteristics of N2O Flux in Estuary Wetland of Jiaozhou Bay in Autumn and Winter[J]. SCIENTIA GEOGRAPHICA SINICA, 2011
, 31(4)
: 464
-469
.
DOI: 10.13249/j.cnki.sgs.2011.04.464
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