胶州湾口内海水中叶绿素浓度的周年变化和垂直分布

VERTICAL AND SEASONAL VARIATIONS OF CHLOROPHYLL CONCENTRATIONS IN THE INLET OF JIAOZHOU BAY,QINGDAO

于1983年11月—1985年11月在胶州湾的两个观测站逐月进行了2周年的海水中叶绿素浓度的定点研究。结果表明，（1）胶州湾口表层海水中的叶绿素a平均浓度为3．05（1．02－15．62）mg／m3；真光层中平均为26．34（9．97－106．59）mg／m2；其季节变化呈春（3—4月）、秋（9—11月）双峰型。（2）小型（＜78μm）的浮游植物平均占海水中叶绿素a的85．76％。（3）叶绿素a／c比在表层海水中平均为2．41，真光层中平均为2．60；叶绿素a／b比和叶绿素a与类胡萝卜素的比值均大于10。（4）春季，叶绿素的最大层出现在0－3m层；夏、秋季，逐渐下移；冬季，上、下层叶绿素a浓度比较均匀。认为胶州湾的浮游植物生物量和初级生产力都很高，可以发展海水养殖业。

The monthly concentrations of chlorophyll a at two stations in the inlet ofJiaozhou Bay, Qingdao, China (Station 1: 120° 14.60'E, 36°04.00'N; Station 2:120° 16.54'E, 36°04.46'N) during the period of November, 1983 to November, 1985ranged from 1.02 to 15.62 mg/m3 with an annual average of 3.05 mg/m3 in the surfacewater. The integrated chlorophyll a value in the water column of euphotic zone ranged from 9.97 mg/m2 to 106.59 mg/m2 and was 26.34 mg/m2 on the average. Seasonally, there was a major peak (44.22-65.15 mg/m2) in the spring and a minorone (34.02-55.50 mg/m2) in fall consistent with the pattern of phytoplankton concentration in most Chinese coastal waters reported by others. Depth of the chlorophyll a maximum layer varied with season, i. e. in the top 3 m during the springand summer and at greater depth in the winter. The phytoplankton < 78μm comprising essentially of diatoms and dinoflagellates contributed 85.76% of phytoplanktonbiomass on the average (58.4%-96.5 % ). The mean ratio of chlorophyll a:c was2.41 in the surface water and 2.60 in the euphotic zone. The mean ratio of chlorophyll a:b and chlorophyll a:carotenoid were both larger than 10.The seasonal and vertical distributions of chlorophyll a concentrations were discussed in relation to the physical and chemical oceanographic process. The high phytoplankton biomass, high primary productivity along with sufficient nutrients in thebay would sustain active mariculture.