中文摘要：

根据2013年钦州湾的水质自动监测数据结果,对其水质变化趋势进行了分析,并对其水质超标情况进行了统计和评价。结果表明：pH月均值范围为7.53~8.21,呈现出明显的季节变化,主要表现为春、冬两季高于夏、秋两季。海水pH值和盐度相关性明显,表明盐度受河流输入影响较大。溶解氧（DO）月均值范围为5.72~9.47 mg/L,呈现出明显的季节变化特征,表现为夏季最低,冬季最高,春、秋季大致相当。溶解氧季均值均达到一类水质标准。其中GX04和GX06站位活性磷酸盐（DIP）月均值范围为0.002 3~0.027 9 mg/L,GX04站位季均值表现为春季〉夏季〉秋季〉冬季,而GX06站位季均值表现为冬季〉秋季〉春季〉夏季。GX04和GX06站位活性磷酸盐季均值均达到一类水质要求。活性磷酸盐与盐度呈显著性负相关（P〈0.05）,表明海水中的活性磷酸盐主要以河流输送为主。

英文摘要：

The variation tendency of seawater and statistics of water quality exceeding the standard were analyzed based on 2013 automatic monitoring data in Qinzhou Bay. The result showed that pH of monthly average ranged from 7.53 to 8.21 had seasonal variations, higher in spring and winter but relatively lower in summer and autumn. A significant correlation was observed between pH and salinity which showed salinity was greatly influenced by rivers input. Monthly average concentrations of DO ranged from 5.72 to 9.47 mg/L had seasonal variations, higher in winter, lower in summer, while the spring equal to the autumn. The seasonal average DO concentration showed that the seawater quality satisfied the Grade I in seawater quality standard. Monthly average concentrations of DIP ranged from 0.002 3 to 0.027 9 mg/L at the station GX04 and GX06 had seasonal variations, with seasonal average concentration satisfactory to the Grade I in seawater quality standard. A significant correlation was observed between DIP and salinity, which showed that DIP of seawater was greatly influenced by rivers input.