Riparian zones as the transition zone between terrestrial and aquatic ecosystems play an important role in C and N cycling and greenhouse gas (GHG) emissions. As such, they may help to mitigate climate change but could also accelerate it, depending on the particular processes affected by changes in the hydrologic regime. Hydrological observations indicated frequent shallow groundwater in the riparian zone, especially near the stream and during the wet winter and spring seasons with consequently frequent occurrence of soil water saturation. The redox potential was mainly governed by the soil water regime: under water saturation conditions, the redox potential of the soil decreased and returned to the oxic state after soil drainage. We found that soil temperature and soil water content were the main drivers of the variations in CO₂ fluxes, with highest CO₂ emission during summer and the lowest emissions in the winter period (162.2–5.4 mg CO₂–C m⁻² h⁻¹). The annual average daily N₂O emission rate was low (2.3 μg N₂O-N m⁻² h⁻¹), with the highest average daily N₂O emission in March as a result of low temperature and partial soil saturation after heavy precipitation events (37.5 μg N₂O-N m⁻² h⁻¹). Our study showed that continuous measurement of redox potential, soil temperature, and soil water content can improve the understanding of GHG emissions in riparian zones.

中文翻译：

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使用自动监测系统调查小型源头集水区河岸带温室气体排放控制

河岸带作为陆地和水生生态系统之间的过渡带，在碳氮循环和温室气体（GHG）排放中发挥着重要作用。因此，它们可能有助于缓解气候变化，但也可能会加速气候变化，具体取决于受水文状况变化影响的特定过程。水文观测表明，河岸带浅层地下水频繁出现，尤其是在溪流附近和冬春季潮湿的季节，因此经常发生土壤水分饱和。氧化还原电位主要受土壤水分状况控制：在水分饱和条件下，土壤的氧化还原电位降低并在土壤排水后恢复到好氧状态。我们发现土壤温度和土壤含水量是 CO 变化的主要驱动因素_{2 个}通量，夏季CO ₂排放量最高，冬季排放量最低（162.2–5.4 mg CO ₂ –C m ^-2 h ^-1）。年平均日N ₂ O排放率较低（2.3 μg N ₂ O-N m ^-2 h ^-1），3月份日均N ₂ O排放量最高，原因是强降水事件后低温和部分土壤饱和(37.5 μg N ₂ O-N m ^-2 h ^-1）。我们的研究表明，连续测量氧化还原电位、土壤温度和土壤含水量可以提高对河岸带温室气体排放的了解。