摘要
于2006年夏季(8月)和2007年冬季(2月)对胶州湾叶绿素a的分布进行了2个航次的调查,并对该海域叶绿素a的季节分布与变化特征进行了分析。结果显示:(1)整个调查海域夏季的平均叶绿素a浓度为3.80 mg/m3,冬季为1.32mg/m3,夏季的明显高于冬季。(2)在空间水平分布上也呈现一定的规律性:①水平分布上:夏季胶州湾湾口的平均叶绿素a浓度明显高于湾内的平均浓度,而冬季则正好相反,即湾内的平均浓度高于湾口;②垂直分布上,夏季次表层(5 m)叶绿素a的浓度最高,表层次之,底层的浓度最低;而冬季的叶绿素a浓度则呈现出由表层向底层逐渐下降的趋势;③另外,24 h昼夜连续调查的结果表明,叶绿素a浓度变化呈现出昼夜节律变化的特点,其白天的浓度高于夜间。结果表明,胶州湾叶绿素a浓度存在明显的季节变化和空间分布特征,结合同期的环境因子(如温度、盐度、透明度、溶解氧等)调查结果分析后发现,调查海域中环境因子的季节性变化可能是导致本结果的最可能的原因之一。
An investigation on distribution characteristics of chlorophyll a in Jiaozhou Bay was carried in August 2006(summer) and February 2007(winter).Results showed sigmificant? seasonal variations in Summer and Winter: the average chlorophyll a concentration of the study area was 3.80 mg/m3,which was much higher than 1.32 mg/m3 in winter.We also found an obvious characteristic in the horizontal distribution,ie..the average chlorophyll a concentration in the mouth of the bay was much higher than that within the bay in summer,with the reverse in winter.As to the vertical distribution,the chlorophyll a concentration decreased from surface to bottom with the exception of the 5 m layer,which had the highest concentration compared to other layers in summer.The vertical variation presented a similar tendency in winter,but the change was not as obvious as that in the summer.Moreover,a diurnal rhythm was found in the changes of chlorophyll a concentration,and the concentration in daytime was higher than that at night.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第S2期127-130,114,共5页
Periodical of Ocean University of China
基金
教育部新世纪优秀人才支持计划项目资助
关键词
胶州湾
叶绿素A
季节变化
分布特征
Jiaozhou Bay
chlorophyll a
seasonal changes
distribution
