• 责任者：Xie Wenxia (Department of Environmental Science ; Qingdao University ; Qingdao 266071 ; China) ; Zhao Quansheng
• 刊名：Scientia Geographica Sinica
• 出版年：2011
• 卷期：31(4)
• 关键词：氮 ; nitrogen ; 温室气体 ; greenhouse gases ; 胶州湾 ; Jiaozhou Bay
• 页码：p.464-469
• 图表：3 illus., 3 tables, 22 refs.
• 分类号：1800
• issnNo：ISSN1000-0690
• isbnNo：CN22-1124/P

Characteristics of N<SUB>2O 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 5 cm, 10 cm ground temperature (P<0.05). The relation between N₂O fluxes in Phragrmites australis wetland and 5 cm, 10 cm ground temperature was not significantly, N₂O emission and absorption in Phragrmites australis wetland was influenced largely by the tides.