We evaluated the relationship between environmental indices and succession in the algal communities of artificial reefs near Lidao, Rongcheng. We documented species diversity and biomass on a quarterly basis between August 2009 and August 2010, about 3 years after the reefs were installed. We documented thirteen algal species belonging to three divisions. Of these, six species belonging to Rhodophyta dominated the flora numerically. Conversely, Phaeophyta had the highest biomass density (92.724 g/m2). The algal community had reached maturity after three years of development. The number of species and biomass were higher in summer and autumn than in spring and winter. Both cluster analysis and detrending correspondence analysis revealed 83.1% similarity between algal communities in rock reefs and natural reefs. Both the biomass and diversity index were higher in algal communities in rock and natural reefs than in concrete reefs. PC A and DC A analysis suggested that temperature was the major environmental factor affecting the algal communities, explaining 47.6% of the variation. Nitrogen and phosphorus constituted secondary factors in the natural reef area whereas pH and dissolved oxygen (DO) levels were secondary in artificial reef areas.%2009年8月-2010年8月间,每隔2个月对荣成俚岛人工鱼礁区投放3年后的2种人工鱼礁及自然礁石上附着的大型藻类进行潜水采样调查,分析藻类群落演替规律及其与环境因子的关系.结果表明,采集到附着藻类共3门13种,其中红藻门(Rhodophyta)藻类的种类数最多(6种),褐藻门(Phaeophyta)藻类的平均生物量最大(92.724 g/m2).人工鱼礁上附着的藻类群落渐趋成熟；夏秋季藻类种类数和生物量均高于春冬季.聚类分析和去趋势对应分析(DCA)表明,石块礁和自然礁石上藻类群落结构相似度(83.1％)较高,其生物量及群落多样性指数均高于混凝土礁体.主成分分析(PCA)和冗余分析(RDA)结果表明,水温是影响藻类群落变化的最主要因子,对藻类群落变化的解释量达到47.6％.影响自然礁石上藻类群落变化的次要因子为N、P营养盐,而影响石块礁和混凝土礁体上藻类群落变化的次要因子为pH和溶解氧.
展开▼
