Based on the data obtained by continuous monitoring of chlorophyll-a content in the Crassostrea rivularis reproduction area in Qinzhou City in Guangxi during 2005 -2010. By dint of the Spearman rank correlation method of Danniel tendency examination, the changes of the water chlorophyll-a content in the production area was studied. Results suggested that the chlorophyll-a content in the production area was stable and there weren't any practical changes in six years.%依据2005 ～2010年对广西壮族自治区钦州市近江牡蛎增养殖区水体叶绿素a含量进行连续监测所取得的数据,采用Danniel趋势检验的Spearman秩相关系数法对该增养殖区水体叶绿素a含量的变化趋势进行分析.结果表明,该增养殖区水体叶绿素a含量保持较平稳状态,6年间没有实质性趋势变化.
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