菹草着生藻类的群落结构与数量特征初步研究

池塘中菹草着生藻类包括硅藻门、绿藻门、蓝藻门、裸藻门、黄藻门和隐藻门的种类 ,共 5 0属 6 8种 ;常见优势种以硅藻门和绿藻门的种类为主。菹草整个生活史中 ,着生藻类的平均着生密度以硅藻门最大 (2 9.90× 10 3 ind ./cm2 ) ,其次为绿藻门 (16 .87× 10 3 ind ./cm2 )和蓝藻门 (13.5 2× 10 3 ind./cm2 ) ;就平均生物量而言 ,硅藻门 (70 .2 0 μg/L)较其他藻类高得多。着生藻类的着生与菹草生长相互抑制 ,着生藻类的密度和生物量表现出明显的季节差异

SPECIES COMPOSITION AND QUANTITATIVE FEATURES OF PERPHYTIC ALGAE COMMINITIES ON POTAMAGETON CRISPUS L.

Samples of Potamageton crispus L. were collected in different growing seasons of the plants and the species composition and quantitative feature of periphytic algae on them were investigated. Altogether 68 species of periphytic algae were found, involving 50 genera. The algae were categorized in the phyla of Bacillariphyta, Chlorophyta, Cyanophyta, Euglenophyta, Xanthophyta and Cryptophyta. The common dominant species were in Bacillariphyta and Chlorophyta. P. crispus L and the periphytic algae on it restricted each other's growth. The density and biomass of the periphytic algae showed a striking seasonal variation with the growth of P. crispus.