深沪湾大型底栖动物群落及其次级生产力初步研究

Macrobenthic community and its secondary production in Shenhu Bay

2006年1、4月和2008年8月共3个季节在深沪湾潮下带10个取样站定量采集大型底栖动物.根据各个季节获得的大型底栖动物栖息丰度和生物量,采用Brey(1990)的经验公式进行了大型底栖动物次级生产力和P/B值的计算,得出深沪湾潮下带大型底栖动物年平均次级生产力和P/B值分别为0.599g(AFDW)/(m2.a)和1.561.深沪湾大型底栖动物生物量和平均次级生产力的空间分布为湾顶>湾中>湾口.与2000年以来我国近海港湾和河口相关研究结果比较,深沪湾大型底栖动物群落的生态特点是栖息丰度、生物量和次级生产力低,但种类多样性指数较高.这些特征与深沪湾面积小、水动力强和沙质沉积物等环境因素有关.

Macrobenthos investigation was carried out at 10 stations in Shenhu Bay in January, April 2006 and August in 2008. Brey＇ s （1990） empirical formula was used to calculate the secondary production and P/B ratio of macrobenthos according to macrobenthos biomass and abundance obtained in Shenhu Bay. The results showed that the mean annum secondary production and P/B ratio were O. 599g （AFDW）/（ m2- a） and 1. 561 respectively. The macrobenthic biomass and secondary production was the highest in the bottom, the second in the bay center and the lowest in the bay opennings. Compared the data of other bays and estuaries,it is concluded that the ecological trait of macrobenthic community structure was lower in density, biomass and secondary production, but higher in species diversity index. Such characters might be due to small area, stronger hydrodynamics and sandy sediments of Shenhu Bay.