引江济太对太湖贡湖湾氧化亚氮通量的影响

选取引江济太工程中长江来水进入太湖第一站的贡湖湾为研究对象，基于2011年11月~2013年8月在贡湖湾的逐月野外调查，同时以湖心水域为参考，探讨引江济太对湖体N₂O通量的影响.结果表明，贡湖湾N₂O排放通量要显著高于湖心排放量，其N₂O通量均值分别为6.9，2.1μmol/（m²·d），但在非引水期间2个湖区的N₂O通量无显著差异.贡湖湾和湖心N₂O通量呈现明显的季节变化，且均与水温呈显著负相关关系，但因受外源来水的影响，贡湖湾N₂O通量的温度依赖程度相对较低.另外，2个湖区的N₂O通量还与营养盐等因素有关.总体上，外源引水提高了贡湖湾N₂O排放通量，但考虑到湖泊N₂O通量受到内部和外部因子的综合协同影响，外源引水对湖泊N₂O通量的具体调控机理还需要进一步探讨.

Effects of water diversion from Yangtze River to Lake Taihu on N2O flux in Gonghu Bay,Lake Taihu

As the first station for monitoring the Yangtze River water diverted to Lake Taihu, Gonghu Bay was the best place to investigate the effects of water diversion on N₂O flux. Monthly measurements were conducted in Gonghu Bay and in the central zone of Lake Taihu from November 2011 to August 2013. N₂O flux in Gonghu Bay was significantly higher than that in central zone, with a mean value being 6.9 and 2.1μmol/(m²·d), respectively. However, the N₂O flux showed insignificant differences between these two zones when no water was diverted. Seasonal variability of the N₂O flux in these two zones were illustrated, which was negatively correlated with water temperature. Water diversion may complicate the effect of temperature on N₂O flux at Gonghu Bay. Water diversion increased the lake N₂O emission flux, while lake N₂O flux is controlled by multiple and interconnected internal and external factors, further studies are needed to explore the underlying control mechanisms.