草业学报2011，Vol.20Issue(3)：51-61,11.
黄河口滨岸潮滩湿地CO2、CH4和N2O 通量特征初步研究
A preliminary study on carbon dioxide, methane and nitrous oxide fluxes from intertidal flat wetlands of the Yellow River estuary
摘要
Abstract
The diurnal variation characteristics of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) fluxes from intertidal flat wetland of the Yellow River estuary were observed in situ with a static-chamber and GC in August 2009. CO2, CH4 and N2O fluxes from the low tidal flat sediment showed an obvious diurnal variation. The flux ranges were from -18. 754 6 to 43. 730 8, -0.0(69 8 to 0. 224 2 and -0. 001 6 to 0. 008 3 mg/(m2·h), and the daily average fluxes were 11. 629 7, 0.078 7 and 0. 004 6 mg/(m2·h), respectively, which showed that the low tidal flat sediment was the source of atmospheric COz, CH4 and N2O. The flux ranges of CO2, CH4 and N2O in the middle tidal flat sediment were from -30. 779 9 to 25. 734 2,-0. 111 3 to 0. 1001 and -0. 004 4 to 0. 006 3 mg/(m2·h), and the daily average fluxes were 4. 569 9,0. 011 3 and 0. 002 3 mg/(m2 · h), respectively, which showed that the middle tidal flat sediment was also the source of atmospheric CO2, CH4 and N2O. The flux ranges of CO2, CH4 and N2O in the high tidal flat were from 46. 253 3 to 102.637 4, -0. 210 9 to 0.047 5 and -0. 008 3 to 0. 007 8 mg/(m2·h), and the daily average fluxes were 76. 656 1, -0. 037 9 and -0. 002 0 mg/(m2·h), respectively, which showed that the high tidal flat was not only the source of atmospheric CO2 but also a sink for atmospheric CH4 and N2O. Further analysis showed that CO2 flux from the middle tidal flat sediment was significantly positively correlated with atmospheric temperatures (P＜0.05), as was the CH4 flux from the low tidal flat sediment (0 and 5cm ground temperatures (P＜0. 01)), but the N2O flux from the middle tidal flat sediment was significantly negatively correlated with atmospheric temperatures and different depths of ground temperatures (5, 10 and 20 cm) (P＜0.05 or 0.01). In addition, sediment solvent and the Suaeda salsa community were the main factors affecting the flux characteristics of CO2, CH4 and N2O, while soil water content and salinity also affected them.关键词
CO2/CH4/N2O/潮滩/黄河口Key words
carbon dioxide/ methane/ nitrous oxide/ intertidal flat/ Yellow River estuary分类
农业科技引用本文复制引用
王玲玲,孙志高,牟晓杰,孙万龙,宋红丽,姜欢欢..黄河口滨岸潮滩湿地CO2、CH4和N2O 通量特征初步研究[J].草业学报,2011,20(3):51-61,11.基金项目
国家海洋局海洋-大气化学与全球变化重点实验室基金(GCMAC1002),国家自然科学基金项目(40803023),山东省自然科学基金重点项目(ZR2010DZ001),中国科学院知识创新工程重要方向项目(KZCX2-YW-223)和中国科学院战略性先导科技专项(XDA05030404)资助. （GCMAC1002）
