海南红树林湿地沉积物耗氧及其相关因素

SEDIMENT OXYGEN DEMAND AND RELEVANT FACTORS IN WETLAND OF MANGROVE FOREST IN HAINAN ISLAND

于2009年8月在海南省东寨港、亚龙湾青梅港和三亚河口红树林区,分别采用自行研制的沉积物耗氧量(Sediment oxygen demand,SOD)测定装置,对红树林湿地SOD和相关环境因子进行研究。结果表明,红树林湿地沉积物耗氧主要分为2个阶段,即瞬时耗氧阶段和渐缓耗氧阶段。3个站位的SOD值范围为102.2-157.7mg/(m2·h),其中瞬时耗氧占23.3%-45.5%。SOD与沉积物中的硫化物含量及上覆水中的化学耗氧量(Chemical oxygen demand,COD)、NH4+浓度有显著的相关性。研究结果表明,红树林湿地沉积物能对其上覆水释放有机物并消耗水体中的溶解氧,使水质变差,因此,用红树林湿地处理城市污水可能导致生态恶化。

SOD （Sediment oxygen demand） was measured by a new SOD determination device （self-owned intellectual property rights） in Hainan island mangrove forest during August, 2009, and the relevant factors were studied simultaneity. The result showed that the process of SOD of mangrove wetland consists of two stages, which are instantaneous oxygen demand stage and decrescent oxygen demand stage. The SOD ranged from 120mg/（m2·h） to 160mg/（m2·h） and instantaneous oxygen demand value accounted for 23.3% to 45.5% of the total SOD. The correlation between SOD and environmental factors were also analyzed. There are distinct positive correlation between SOD and sulfide content in sediment and COD, NH4＋ concentration in overlay water, while the correlation between SOD and organic matter in sediment is unconspicuous. Organic matters are released to water from mangrove sediment, which will consume oxygen and cause water pollution, so it is valuable to reconsider to employ mangrove wetland to treat urban waste water.