以东湖郭郑湖为研究对象,将其生态系统中在质和量方面占重要地位的浮游植物-鲢作为亚系统,研究它们之间的相互作用。比较了夏季两个月中鲢的生长和让其充分摄食后的生长,发现最初20天没有差异,20天后两者开始出现差别。将两者的相互作用模型化,计算的结果是,浮游植物被鲢摄食后密度下降,而鲢得不到充足的饵料,导致生长缓慢。观察此期间的氮平衡,浮游植物所生产的氮几乎全部被鲢利用,但浮游植物所需要的78%的氮又是鲢提供的。这说明在湖区整个生态系统中,此相互作用系统在量的方面是很重要的。 Taking Lake Guo Zhenghu as the research object, the phytoplankton - silver carp, which plays an important role in the quality and quantity of its ecosystem, was used as a sub-system to study the interaction between them. After comparing the growth of silver carp and its full feeding after two months in summer, we found no difference in the first 20 days and the difference started to appear after 20 days. The interaction between the two models was modeled, and the result of the calculation was that the density of phytoplankton after being ingested by silver carp declined, while the silver carp did not receive sufficient feed, resulting in slow growth. Observing the nitrogen balance during this period, almost all nitrogen produced by phytoplankton is utilized by silver carps, but 78% of the nitrogen required for phytoplankton is in turn provided by silver carp. This shows that in the entire ecosystem of the lake area, this system of interactions is important in terms of quantity.