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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Drivers of CO2 along a mangrove-seagrass transect in a tropical bay: Delayed groundwater seepage and seagrass uptake
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Drivers of CO2 along a mangrove-seagrass transect in a tropical bay: Delayed groundwater seepage and seagrass uptake

机译：CO2的司机沿着红树林 - 海草在热带海湾横断横断：延迟地下水渗流和海草摄取

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摘要

Water-to-air carbon dioxide fluxes from tropical coastal waters are an important but understudied component of the marine carbon budget. Here, we investigate drivers of carbon dioxide partial pressure (pCO(2)) in a relatively pristine mangrove-seagrass embayment on a tropical island (Bali, Indonesia). Observations were performed over eight underway seasonal surveys and a fixed location time series for 55 h. There was a large spatial variability of pCO(2) across the continuum of mangrove forests, seagrass meadows and the coastal ocean. Overall, the embayment waters surrounded by mangroves released CO2 to the atmosphere with a net flux rate of 18.1 +/- 5.8 mmol m(-2) d(-1). Seagrass beds produced an overall CO2 net flux rate of 2.5 +/- 3.4 mmol m(-2) d(-1) , although 2 out of 8 surveys revealed a sink of CO2 in the seagrass area. The mouth of the bay where coral calcification occurs was a minor source of CO2 (0.3 +/- 0.4 mmol m(-2) d(-1)). The overall average CO2 flux to the atmosphere along the transect was 9.8 +/- 6.0 mmol m(-1)d(-1), or 3.6 x 10(3) mol d(-1) CO2 when upscaled to the entire embayment area. There were no clear seasonal patterns in contrast to better studied temperate systems. pCO(2) significantly correlated with antecedent rainfall and the natural groundwater tracer radon (Rn-222) during each survey. We suggest that the CO2 source in the mangrove dominated upper bay was associated with delayed groundwater inputs, and a shifting CO2 source-sink in the lower bay was driven by the uptake of CO2 by seagrass and mixing with oceanic waters. This differs from modified landscapes where potential uptake of CO2 is weakened due to the degradation of seagrass beds, or emissions are increased due to drainage of coastal wetlands.
机译：来自热带沿海水域的水 - 空中二氧化碳通量是海洋碳预算的一个重要而被清算的组成部分。在这里，我们调查在热带岛屿（Bali，Indonesia）的相对原始的红树林扶手中的二氧化碳分压（PCO（2））的司机。在55小时内进行8次进行八次季节调查和固定位置时间序列进行观察。在红树林林，海草草甸和沿海海洋中，PCO（2）存在大量空间变异性。总体而言，装载水域被红树林包围到大气中，净通量率为18.1 +/- 5.8 mmol m（-2）d（-1）。海草床产生了总体二氧化碳净通量2.5 +/- 3.4mmol m（-2）d（-1）的净通量速率，尽管8个调查中的2个液体中的2个纸张在海草区域中显示了CO2的水槽。发生珊瑚钙化的海湾的口是CO 2的次要来源（0.3 +/- 0.4mmol m（-2）d（-1））。沿横断的大气的总体平均二氧化碳通量为9.8 +/- 6.0mmol M（-1）D（-1）D（-1），或3.6×10（3）摩尔D（-1）二氧化碳，在整个压杆区域上升时。与更好的温带系统相比，没有明确的季节性模式。每次调查期间，PCO（2）与先行降雨和天然地下水示踪氡（RN-222）明显相关。我们建议红树统治的上海湾中的CO2源与延迟地下水输入相关，下湾的移位二氧化碳源水槽是通过海草的摄取和与海水混合的二氧化碳的摄取驱动。这与修改化的景观不同，其中由于海草床的降解导致CO2的潜在摄取，或由于沿海湿地的排水，排放量增加。

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