鄱阳湖底栖动物生态研究及其底层鱼产力的估算

研究了鄱阳湖底栖动物种类组成，数量分布、季节变化及其与环境因子的关系等生态特点并估算了底层鱼类的生产潜力。结果表明，鄱阳湖底栖动物种类丰富，平均总生物量为２４６．４２６ｇ／ｍ＾２，平均栖息密度为７２１个／ｍ＾２。生物量和栖息密度的分布极不均匀，呈Ｅ＝Ｐ核心分布，局部区域的水动力特点、水生植被类型、不同沉积物类型都影响底栖动物种群和数量的分布。

STUDIES ON THE ECOLOGY OF ZOOBENTHOS AND THE ESTIMATION OF BOTTOM-FISH PRODUCTIVITY IN POYANG LAKE

This paper studied the ecological characteristics of zoobenthis fauna in Poyang Lake,including its composition, distribution and seasonal variation. Studied the relationship between the distribution and inhabiting environments of zoobenthic fauna. Based on the data obtained from the various region in Poyang Lake August, 1981 to October, 1992, bottom-fish productivity of Poyang Lake was estimated.Ninety five species were identified in the surveyed region. The everage of the density and the biomasses of the zoobenthic founa were 721 individuos/m2 and 246.426g/m2 respectively. The distribution of the species, the density and biomass of the zoobenthos at various region were extremely uneven. Among the environmental factors which influenced the ecological characteristics of zoobenthic fauna, hydrographic dynamics and different sediments were the most important,followed by different ecological types of aquatic plants. It was estimated, that the bottom-fish productivity would be around 51.225kg per hactare each year. Tentative proposals were suggested in order to exploite and utilize the aquatic resources in Poyang Lake.