厦门潮间滩涂小型底栖硅藻和叶绿素的分布

DISTRIBUTION OF CHLOROPHYLL AND BENTHIC DIATOMS IN THE INTERTIDAL FLAT AROUND XIAMEN

厦门海域潮间滩涂小型底栖藻类的叶绿素a的年变化范围为0.35—130mg/m^2,平均为18.5mg/m^2,脱镁叶绿素年变化范围为0.2—411mg/m^2,平均为57.9mg/m^2。在43属162种及变种的底栖硅藻中,常见的优势种有小伪菱形藻双楔变种(Pseudo-Nitzschia sicula v. Bicuneata)和弯菱形藻(Nitzschia sigma)等。研究结果表明:生态环境的不同导致两种叶绿素比值的变化,河口区海水盐度的梯度分布决定底栖硅藻种群结构的差异,各个时期温度、降雨等环境因素的变化影响种群数量在潮区间的分布。

Some ecological characteristics of microphytobenthos in the intertidal flat around Xiamen were studied in 1987. These include the abundance and the distribution of benthic diatoms, and the chlorophyll concentration of microphytobenthos. Annual range of 0.35-130mg/m2 with the average of 18.5mg/m2 for chloropyll a and 0.2-411mg/m2 with the average of 57.9mg/m2 for phae-ophytin showed that the microphytobenthos is the main primary producer in the benthic ecosystem. All 162 species of benthic diatoms have been identified, belonging to 43 genera in which Pseudo-Nitzschia sicula v. bicuneata and Niizschia sigma are most dominant species. The gradient distribution of salinity resulted from the input of fresh water from Jiulongjiang river determines the population distribution of benthic distoms. The abundance of benthic diatoms varies positively with the radiation time and the temperature, negatively with the amount of rainfall during som months of raining season in lower salinity flat have been discussed.