利用2007年12月至2008年11月对广西沿海4个海湾红树林区进行系统调查的数据资料，分析不同海湾红树林区Si含量的变化特征及其与环境因素的关系。结果表明，广西海湾红树林区Si含量较高，年平均值高达52.26µmol·dm-3，明显高于20世纪80年代河口区的30.83µmol·dm-3；在季节上主要依赖于径流的变化而呈夏高、冬低，春、秋季适中的特征，区域分布亦具有随S下降而增加，随硅藻占浮游植物比例上升而下降的良好规律，依次排列为廉州湾＞钦州湾＞珍珠湾＞铁山港红树林区。相关分析显示，影响研究海区Si含量变化的主要因素是陆源径流与海水的物理混合过程，其次是生物作用，有机体分解的化学过程影响相对较小。Si与N、P营养盐的关系极为密切，其中Si与N的同源性极好，4个季节均达到了非常显著（p值<0.01）的正相关水平；而Si与P含量之间却出现明显分区现象，海湾特征尤为突出。%Based on the data from system surveys along the 4 mangrove area Bays in Guangxi from December 2007 to November 2008, it was the first time that the relationship had been analyzed totally between variation of silicon content in different mangrove areas and the environmental factors. The results are as follows:The annual average of Si content was high, 52.26 µmol·dm-3, in mangrove area of Guangxi bays, which was significantly higher than the estuary which was 30.83 µmol·dm-3 in 1980s. Seasonal change of Si content was low in summer but high in winter, while moderate in spring and autumn, which was rely on the change of runoff. The regional distribution of Si content in mangrove areas would decrease when S increased and the diatom was rich in phytoplankton. The order was Lianzhou Bay>Qinzhou Bay>Perl Bay>Tieshangang Bay. Correlation analysis showed that the elements affacted the Si content in descending order were physical mixing processes of terrestrial runoff and sea water, biological action, chemical process of organic decomposition. The content of Si had close relationship to the content of N and P nutrient, and there was highly significant positive correlation between Si and N content in the 4 seasons(p<0.01), but the relationship between Si and P content was different in 4 bays, which highlighted the feature of bays.
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