Zhuang Jun-Lian, Xu Ming-Ben, Zhang Rong-Can, Chen Bo
Guangxi Academy of Sciences, Nanning 530007, China.
Ying Yong Sheng Tai Xue Bao. 2011 May;22(5):1309-15.
In March, June, September, and December 2007, investigations were conducted on the species composition, dominant species, community structure, and abundance distribution of phytoplankton in the Fangchenggang Bay of Guangxi. Based on the investigation data, the phytoplankton abundance, biotic index, and their correlations with environmental factors were analyzed. A total of 138 species of 54 genera were identified, among which, 112 species belonged to 37 genera of diatoms, 21 species belonged to 12 genera of dinoflagellates, 2 species belonged to chrysophyta, 2 species belonged to chlorophyta, and 1 species belonged to cyanophyta. In whole year, the dominant species was Skeletonema costatum. The species number had a trend decreasing from the outer to the inner of the Bay and from spring to winter, while the cell abundance was decreased from the inner to the outer of the Bay. There was an obvious annual change in the cell abundance, being the highest (151.39 x 10(4) cells x dm(-3)) in summer (June) and the lowest (0.35 x 10(4) cells x dm(-3)) in winter (December). In spring, both the diversity and the species number were higher. Correlation analysis demonstrated that the distribution of phytoplankton community had definite correlations with water nutrient content, temperature and salinity. At the observation stations 1 and 2 in west Bay, due to the effects of Fangcheng River runoff and hydrodynamic forces such as tide, water salinity was lower and nutrient content was higher, and accordingly, S. costatum cells in summer could greatly reproduce, even result in high probability of red tide.
2007年3月、6月、9月和12月，对广西防城港湾浮游植物的种类组成、优势种、群落结构和丰度分布进行了调查。根据调查数据，分析了浮游植物丰度、生物指数及其与环境因子的相关性。共鉴定出54属138种，其中硅藻37属112种，甲藻12属21种，金藻2种，绿藻2种，蓝藻1种。全年优势种为中肋骨条藻。种类数有从湾外向湾内、从春季到冬季递减的趋势，而细胞丰度则从湾内向湾外递减。细胞丰度有明显的年变化，夏季（6月）最高（151.39×10⁴个细胞·dm⁻³），冬季（12月）最低（0.35×10⁴个细胞·dm⁻³）。春季多样性和种类数均较高。相关性分析表明，浮游植物群落分布与水体营养盐含量、温度和盐度有一定的相关性。在湾西部的1号和2号观测站，由于防城河径流和潮汐等水动力作用的影响，水体盐度较低，营养盐含量较高，因此夏季中肋骨条藻细胞能大量繁殖，甚至导致赤潮发生概率较高。
