汾河太原段水体浮游藻类生态位的研究

采用Levins生态位宽度公式和Petrailis生态位重叠指数测定了汾河太原段34个优势藻种的生态位宽度和生态位重叠,并对生态位宽度和生态位重叠的关系进行了初步探讨。结果表明,在清洁河段,优美曲壳藻的生态位最大,在水质较差的断面,以纤维藻属的2个种和中间菱形藻的生态位最宽。从生态响应速率值看,清洁河段中,扭曲小环藻的进攻性最强;在污染段,平片针杆藻的进攻性最强。从生态位普遍重叠指数分析,清洁带高于污染带,表明在污染水体中,藻类分化明显,而清洁水体中,藻类对资源的利用充分。

Niche Analysis of Algae Species in Taiyuan Segment of Fenhe River

The niche breadths and overlaps of 34 dominant algae species in Taiyuan segment of Fenhe River were measured using the formula proposed by Levins and Petrailis, and the relationships between niche breadth and niche overlaps were discussed. Results showed that the niche breadths of Achnanthes delicatula was greater in clean water and Ankistrodesmus and Nitzschia intermedia were greater in polluted water, which was related with their own characteristics and capability of adaptation to the environment. The aggression of Cyclotella Comta was the strongest in clean water body while Synedra tabulata was the strongest in polluted water body. Algae can make full use of resource in clean water.