摘要
于2009年1—11月对广西钦州典型养殖海湾——钦州湾海域水体中叶绿素a(Chl-a)浓度和初级生产力进行了4个季节航次的调查,分析了该海湾Chl-a和初级生产力的时空变化特征并探讨其影响因素.结果表明,钦州湾表层海水Chl-a浓度周年变化在0.83~32.5 mg·m-3之间,平均为5.39 mg·m-3;Chl-a浓度季节性变化表现为夏季>春季>冬季>秋季.初级生产力变化范围是92.3~1494.5 mg·m-2·d-1(以C计,下同),平均为425.1 mg·m-2·d-1;初级生产力季节变化特征呈现夏季>冬季>秋季>春季.钦州湾Chl-a浓度和初级生产力在春、夏、冬季呈现内湾和三娘湾海区高、钦州港海区低的分布特征,秋季出现相反的特征.相关分析显示,钦州湾Chl-a与水温、盐度和氨氮之间存在密切的相关关系.总体来看,陆源输入的营养盐及贝类养殖活动是影响Chl-a和初级生产力时空变化的重要因素.
Chlorophyll a( Chl-a) concentration and primary productivity were investigated during four cruises from January 2009 to November 2009 in a typical mariculture bay( Qinzhou Bay,Guangxi). The spatio-temporal variations as well as influencing factors of Chl-a were investigated. The concentrations of Chl-a in the surface seawater ranged from 0. 83 to 32. 5 mg·m- 3,with a mean of 5. 39 mg·m- 3. The seasonal variations of Chl-a concentration ranked in the order of summer > spring > winter > autumn. The primary productivity varied from 92. 3 to 1494. 5 mg( C)·m- 2·d- 1with an average of 425. 1 mg( C)·m- 2·d- 1,and exhibited an obvious seasonal variation in the order of summer > winter > autumn > spring. In spring,summer and winter,the Chl-a concentration and primary productivity were higher in the inner bay and Sanniang Bay and lower in the Qinzhou Port area,but an opposite distribution pattern was observed in autumn. Correlation analysis indicated that the Chl-a concentrations were closely related to water temperature,salinity and ammonium levels. In summary,terrestrial input of nutrients and shellfish cultures might be the main factors influencing the variations of Chl-a concentration and primary productivity.
出处
《环境科学学报》
CAS
CSCD
北大核心
2015年第5期1333-1340,共8页
Acta Scientiae Circumstantiae
基金
广西自然科学基金项目(No.2010GXNSFE013006,2011GXNSFA018123)
广西科学研究与技术开发计划项目(桂科攻No.0992027-1)
广西教育厅科研项目(No.201106LX546)~~
关键词
叶绿素A
初级生产力
时空分布
影响因素
钦州湾
chlorophyll a
primary productivity
spatial and temporal distribution
influence factor
Qinzhou Bay
