珠江三角洲底栖动物群落与水质关系

THE BENTHIC MACROINVERTEBRATE COMMUNITY RELATING TO THE WATER QUALITY IN LOWER ZHUJIANG (PEARL RIVER)

珠江三角洲大型底栖无脊椎动物群落主要由寡毛类、多毛类和软体动物的河蚬(Corbic-ula fluminea)组成.其中寡毛类在整个三角洲水体中均有分布,为群落中的主要成分.多毛类和河蚬在城镇附近绝迹.用生物污染指数(BPI)对水质进行评价,用多元回归方法计算BPI与DO、BOD_5、NH_3-N、NO_3-N之间的关系,并用聚类分析中的相似系数法对水质参数进行处理,将结果归类,最终表明,BPI基本上与水化分析结果吻合.

The community structure of benthic macroinvertebrates in the delta area of lower Zhujiang (Pearl River) was constituted mainly by Oligochaeta, Po-lychaeta and Corbicula fiuminea (Mollusca). Among them Oligochaeta was apparently the dominant organism as it was found throughout the river system, while Polychaeta and Corbicula fiuminea were absent in the reaches around urban areas. The biological pollution index (BPI) was served as an approach to synthesize the biological parameters and evaluate the water quality. In order to test the confidence of BPI, multi-regression technique was used to reveal the relationship between BPI and water parameters; similarity coefficient of cluster analysis was applied to the same parameters from which several groups were classified, All results showed that BPI is essentially as effective as chemical approaches to the water quality assessment.