National Institute of Oceanography, Regional Centre, Council of Scientific and Industrial Research (CSIR), Kochi 682 018, Kerala, India.
Mar Environ Res. 2012 Aug;79:160-6. doi: 10.1016/j.marenvres.2012.05.005. Epub 2012 May 27.
Eutrophication has often been one of the major problems encountered in estuaries and coastal waters. The oxic/anoxic status of an estuary can be effectively determined by measurement of the Sediment Oxygen Demand (SOD). The present study forms a pioneering attempt to evaluate the SOD of the Cochin Backwater System (CBS), a tropical eutrophic estuary in the south-west coast of India. The CBS exhibited significant spatio-temporal variations in SOD. The mean net SOD during the dry season (2569.73 μmol O(2) m(-2) h(-1)) was almost twice that of the wet season (1431.28 μmol O(2) m(-2) h(-1)), presumably due to higher discharge during the latter season. The observed pockets of net oxygen release indicate that the CBS still retains certain autotrophic regions in spite of heavy organic drains. The low oxygen flux in light chambers points towards the role of microphytobenthos in maintaining the oxygen reservoir of the estuarine system.
富营养化一直是河口和沿海水域面临的主要问题之一。通过测量沉积物需氧量（SOD）可以有效地确定河口的好氧/缺氧状态。本研究首次尝试评估印度西南海岸热带富营养河口科钦泻湖系统（CBS）的 SOD。CBS 的 SOD 存在显著的时空变化。旱季的平均净 SOD（2569.73 μmol O(2) m(-2) h(-1)）几乎是雨季的两倍（1431.28 μmol O(2) m(-2) h(-1)），这可能是由于后者季节的排放量更高。观察到的净氧释放点表明，尽管有大量有机物流失，但 CBS 仍保留了某些自养区。浅光室中的低氧气通量表明微藻在维持河口系统氧气库方面的作用。
