草型湖泊与藻型湖泊大型底栖动物生产力的比较

The Comparison of Secondary Production of Macrozoobenthos Between a Typical Algal Lake and a Typical Macrophytic Lake

较系统地比较了典型草型湖泊(扁担塘)与典型藻型湖泊(后湖)底栖动物优势种类、主要类群及整个群落的周年生产量.结果表明,典型草型湖泊扁担塘底栖动物群落的周年生产量(湿重或带壳湿重)38.926g/穴m2·a雪比典型藻型湖泊后湖47.505g/穴m2·a雪为低.各类群具体情况为,后湖(藻型湖泊)的营养水平较高,更适合苏氏尾鳃蚓等耐污性种类的生长,因此寡毛类生产量较扁担塘的为高;藻型湖泊比草型湖泊更适合铜锈环棱螺等腐生螺类的生长,螺类的生产量也比草型湖泊略高;藻型湖泊摇蚊的生产量较高,原因在于藻型湖泊更适合具有较多耐污种类的摇蚊生长.但从大型底栖动物群落生产量的组成看,摇蚊、软体动物、寡毛类等三大类群所占份额相对较稳定,分别为14%-15%、77%-79%、7%-8%.

A comparative study on annual production of macrozoobenthos community was carried out in a typical algal lake-Lake Houhu and a typical macrophytic lake-Lake Biandantang.The results showed that the annual pro-duction of macrozoobenthos community in Lake Biandantang(38.926g/(m 2 ·a))was a bit lower than that of Lake Houhu(47.505g/(m 2 ·a)).The eutrophication of Lake Houhu,slightly higher than that of Lake Biandantang,which was much fitter for the growth of pollution-prone species of oligochaetes,resulted in more oligochaete production.Algal lakes bearing preferable situations for the existence of omnivorous gastropods like B.aeruginosa attained higher gastropod production.Large chironomids usually present weed-free,higher entrophication water body,which match the conditions of Lake Houhu,so Lake Houhu liad larger production of chironomid.Nev-ertheless,the proportions of macrozoobenthic production contributed by chironomids,oligochaetes and gas-tropods remained fairly stable,which were14%-15%,7%-8%,77%-79%,respectively.