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Effects of tidal fluctuations on CO2 and CH4 fluxes in the littoral zone of a brackish-water lake

机译：潮汐波动对微咸水湖沿岸带CO2和CH4通量的影响

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摘要

We examined the effects of tidal fluctuations on CO2 and CH4 fluxes from sediment or soil to the atmosphere in the littoral zone of a brackish-water lake during the growing seasons in 2004 and 2005. The dominant plants at the study site formed three sub-zones (Phragmites zone, Juncus zone and Miscanthus zone) across a topographic gradient on the shoreline. In the Phragmites and Juncus zones, we observed a positive correlation between hourly changes in CO2 and CH4 fluxes and changes in the water table. In particular, the magnitude and pattern of daily variation in CO2 and CH4 fluxes were different on days during spring tide and neap tide in the Phragmites and Juncus zones. Variations in CO2 and CH4 fluxes in the Phragmites and Juncus zones over the course of a day during spring tide were correlated with water-table level. We found that the rate of change of the water table, as distinguished from just differences in the water table, was a major environmental factor controlling the CO2 and CH4 fluxes. In the Miscanthus zone during spring tide, soil temperature was the main factor affecting daily variation in CO2 and CH4 fluxes.
机译：我们研究了潮汐波动对咸水湖沿岸带从沉积物或土壤到大气在2004和2005年生长季节期间CO2和CH4通量的影响。研究地点的优势植物形成了三个分区（芦苇带，君子带和芒斯卡特斯带）跨越海岸线上的地形坡度。在芦苇和Juncus地区，我们观察到了CO2和CH4通量的每小时变化与地下水位变化之间的正相关。特别是，在芦苇和Juncus地区春季潮和小潮期间，CO2和CH4通量每日变化的大小和模式是不同的。在春季潮汐的一天中，芦苇和Juncus地区的CO2和CH4通量的变化与地下水位相关。我们发现，与仅因地下水位不同而不同，地下水位变化率是控制CO2和CH4通量的主要环境因素。在春季潮汐的芒草地区，土壤温度是影响CO2和CH4通量日变化的主要因素。

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