摘要
于2008年2月、5月、8月和11月分4个航次调查了流沙湾叶绿素a的分布特征,结果表明,流沙湾的叶绿素a变化范围在0.47～6.35mg/m3,平均值为2.65mg/m3,叶绿素a含量春(5月)、夏(8月)、秋(11月)和冬季(2月)的平均值分别为2.49mg/m3、3.81mg/m3、2.77mg/m3和1.46mg/m3,表现为夏季>秋季>春季>冬季的季节变化模式;在平面分布上,位于网箱养殖区附近9站叶绿素含量最高(3.38mg/m3),位于湾口靠近外海的2站的含量最低(1.35mg/m3),调查海区叶绿素a站位间的平面差异以及湾内外的平面差异均不显著(P>0.05)。叶绿素a和亚硝氮、硝氮、盐度显著负相关(P<0.05)。根据叶绿素a量划分营养类型的标准,流沙湾海域的水质属于贫营养类型,流沙湾低含量的叶绿素a与海区的低营养盐、大型海藻和海草床对营养盐的竞争利用、湾内外水体交换畅通、浮游动物和养殖贝类的摄食情况有关。
From Feb.to Nov.2008,spatial and temporal distributions of concentration of chlorophyll a were surveyed in four seasons in Liusha Bay,and the results showed that the concentration of chlorophyll-a ranged from 0.47 mg/m^3 to 6.35mg/m^3,with an annual average of 2.65 mg/m^3.The average concentration of chlorophyll-a was 2.49 mg/m^3 in spring,3.81mg/m^3 in summer,2.77 mg/m^3 in autumn and 1.46 mg/m^3 in winter respectively,so the seasonal pattern of chlorophyll-a was summerautumnspringwinter.The highest average concentration of chlorophyll-a was found at station 9（3.38 mg/m^3） in fish mariculture areas,while the lowest one presented at station（21.35 mg/m^3）in outside bay.The difference in concentration of chlorophyll a among stations was not significant（P〉0.05）,nor did the difference in that between inner stations and outer station.Correlation analysis showed that the concentration of Chlorophyll-a was significantly negative relative to NO2^--N,NO3^--N,and salinity in this investigation.The water was oligotrophic in Liusha Bay with the chlorophyll a as the assessment criteria.The lower concentration of chlorophyll a might be related to the low content of inorganic nutrients,competitive utilization for inorganic nutrients by algae and sea grass bed,strong water exchange,and grazing phytoplankton by zooplankton and seashells.
出处
《海洋通报》
CAS
CSCD
北大核心
2010年第5期514-520,共7页
Marine Science Bulletin
基金
广东省自主创新重大科技专项(2007A032600004)
关键词
流沙湾
叶绿素A
时空分布
环境因子
Liusha Bay
chlorophyll-a
spatial and temporal distribution
environmental factors
