【摘要】 利用2007年12月至2008年11月间对广西海湾红树林区进行4个季节调查的资料,研究了溶解无机氮的时空变化、组成特征及其与富营养化的关系.结果表明,研究海区溶解无机氮含量较高,年平均质量浓度达0.53 mg/dm3,NO3-N含量占66.93%,是N的主要存在形态;廉州湾红树林区质量浓度最高,为1.15 mg/dm3;其次为钦州湾,为0.41 mg/dm3;铁山港和珍珠湾红树林区较低,均为0.25 mg/dm3;陆源输入是影响DIN含量变化的主导控制因素,生物作用次之,化学作用影响较小.相关分析显示:各种形态无机氮(NO3-N、NO2-N、NH4-N)之间的相似性主要出现于径流影响较小的海区和季节,径流影响较大的海区和季节相似性较差,与N的来源途径广而复杂有关;海区水体已呈明显富营养化,但随海区和季节不同变化极大,径流影响最大的廉州湾红树林区富营养化指数(E)高达24.84,已达高富营养化水平,其余海区均在1.52~1.74之间;DIN是该海区富营养化形成的重要影响因子,DIP次之,COD的影响较小;这是红树林区具有较强水体自净能力的重要体现.更多还原

【Abstract】 Based on the data from seasonal investigation along the mangrove areas of bays in Guangxi from December 2007 to November 2008,spatio-temporal change,composition characteristics of dissolve inorganic nitrogen( DIN) and its relationship with eutrophication was studied. The results shows that the annual average of DIN content was 0. 53 mg / dm3in mangrove areas of Guangxi bays. NO 3-N was important form of N accounting for 66. 93% of the total. The content of N was highest in Lianzhou Bay( 1. 15mg / dm3),the next Qinzhou Bay( 0. 41mg/dm3), and the lowest,Tieshangang Bay and Pearl Bay( 0. 25 mg / dm3). Terrestrial input was the dominant control factor on the variation of DIN,the next was biological factor and the last one chemical factors. Correlation analysis showed that good similarity among the various forms of inorganic N( NO 3-N、NO 2-N and NH 4-N) occurred in the bays and seasons with smaller runoff and vice verse due to widely and complex sources of N. Though the eutrophication were significant,but it differed with sea areas and seasons. For example,Lianzhou Bay which was affected the most by the runoff and the eutrophication index( E) was up to 24. 84 showing a high level of eutrophication in contrast to the eutrophication index( E) only between 1. 52 to 1. 74 in other bays. DIN was the most important factor for eutrophication,the next was DIP,and the minimum,COD. This is an important manifestation of strong self-purification ability in the mangrove areas.更多还原