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太湖梅梁湾温室气体(CO2,CH4和N2O)浓度的昼夜变化及其控制因素

, PP. 1186-1192

Keywords: 富营养湖泊,人为活动,温室气体,昼夜变化

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Abstract:

营养盐载荷增加、富营养化以及全球增温等对湖泊温室气体的影响目前认识还很有限,原因之一在于对湖泊温室气体产生的动力过程了解不够深入,缺少高时间分辨率的现场观测数据。为了解决这一问题,在富营养的太湖梅梁湾水体,每一小时收集一个样品,直接分析N2O和CH4饱和度、CO2分压(pCO2)以及其他地球化学参数。在7月份的观测中,N2O和CH4显示出显著的昼夜变化规律。相关性分析表明,有机质降解是调节湖泊N2O和CH4变化的重要因素之一。虽然人为活动是控制湖泊温室气体大规模变化的主要因素,但沉积物-水界面的生物地球化学过程对温室气体浓度在短时间尺度上的变化有着重要的影响。研究结果揭示了湖泊温室气体除了受人为活动影响外,湖泊自身的生物地球化学过程也是重要的调控因素之一。

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