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根据2008—2009年浙江分水江水库渔业资源和生态环境调查数据,采用Ecopathwith Ecosim软件构建了分水江水库的物质平衡Ecopath模型.模型构成包括鲢、鳙、鳊、花鱼骨、翘嘴鲌、鲴类、其他鱼类、寡毛类、水生昆虫、浮游动物、浮游植物、有机碎屑等14个功能组,较好地模拟了分水江的水库生态系统.结果表明:分水江水库生态系统包含5个营养级,且营养物质流动主要发生在前3个营养级.牧食食物链和碎屑食物链是系统中的主要能流,但是食物网结构较简单,容易受到外界干扰的影响.转移效率在低营养级较低,表明系统的能量利用较低,过多的营养物质储存在系统中可能导致富营养化的发生.较低的联结指数、系统杂食性系数、Finn氏循环指数以及Finn氏平均路径长度值都表明该生态系统处于不稳定状态,而生产量/总呼吸和生产量/生物量的值较高,说明此生态系统的初级生产力远高于其呼吸量,系统处于生态发育前期.分水江水库由于发育历史较短,仍处于由不成熟向成熟发育的过程中.
According to the survey data of fisheries resources and ecological environment in Zhejiang Fenshuijiang Reservoir from 2008 to 2009, Ecopathwith Ecosim software was used to construct the Ecopath model of substance balance of Fenshuijiang Reservoir.The model consisted of silver carp, bighead carp, bighead carp, fishbone, Fourteen functional groups, such as Toxoplasma gondii, Toxoptera, other fish, Oligochaeta, aquatic insects, zooplankton, phytoplankton and organic debris, were used to simulate the reservoir ecosystem of Fenshui River well.The results showed that Fenshuijiang Reservoir The ecosystem contains five trophic levels and the nutrient flows occur mainly in the first three trophic levels.The grazing food chain and debris food chain are the main energy flows in the system, but the food net is relatively simple in structure and susceptible to external disturbances. The lower transfer efficiency at lower trophic levels indicates lower energy utilization of the system and the excessive storage of nutrients in the system may lead to eutrophication. The lower ligation index, the system omnivore factor, the Finn’s Cycle Index and Finn’s mean path length values indicate that the ecosystem is unstable and high values of production / total respiration and production / biomass are indicative of the primary Productivity is much higher than its respiration, the ecological system in the early development due to the short history of the development of watershed River Dam, is still in the process of development of immature to mature.