【摘要】 利用静态箱观测法对春季太湖不同生态类型(藻型、草型)的湖区春季水-气界面碳通量进行了昼夜连续观测,结果表明,水-气界面碳通量存在显著日变化规律,其极值均出现在凌晨5:00和下午2:00左右,但不同湖区碳通量的日变化存在明显差异。在富营养化较严重的梅梁湾湖区,昼间主要为大气CO2的汇,其平均碳通量为-7.74 mg/(m2h),夜间主要为大气CO2的源,其碳通量为5.32 mg/(m2h);湖心区域,夜间为大气CO2的源,日间在源和汇间波动。而在水质较好的东太湖区域,昼夜均为大气CO2的源,其平均碳通量为11.63 mg/(m2h)。更多还原

【Abstract】 With the statistic box, daily variation of the carbon dioxide flux on the water-air interface for different types of habitat (algae and grass) of the Taihu lake was monitored continuously for every 24~48 hours in spring. The results show that the maximum and minimum flux values are about 5:00 am and 2:00 pm respectively, but for different parts of the lake, different rules exist. For the eutrophic part (Meiliang bay) of the lake, the water is the sink for the atmospheric carbon during the daytime and the average carbon flux is -7.74 mg/(m2穐), while at night it抯 the carbon source with the average flux of 5.32 mg/(m2穐). For the center part of the lake, the water is the source for the atmospheric carbon at night, while during the daytime, it becomes the sink or the source inconstantly for the atmospheric carbon. The eastern part of the lake, where the water quality is relatively high, remains as the big carbon source for the atmosphere with the average flux of 11.63 mg/(m2穐).更多还原