Study On The Ecosystem's Design Of Pre-reservoir In The Diffused Pollution Controlling

Lake Taihu basin is a typical plain river network region in our country and its inner river network is crossed. Nutrient accumulates continuously in Lake Taihu, including N. P. and etc, and then eutrophication is strengthened because a large number of unprocessed city polluted water of living and industry is exhausted and flows into Lake Taihu by the development of city and industry. Pre-reservoir technology as one of diffused pollution of control technology gradually attracts attention for its apparent effort in eutrophication control.This article closely connects with sub-topic of prevention technology of environment pollution in the field of resource environment technology of high-new technology research & development plan of our country (Plan 863)--that is pre-reservoir technology of strengthening and purification for river network diffused pollution. The concept of pre-reservoir technology, purification theory and present research condition and its process in and out of our country are introduced firstly in this article, which mentions to research ecosystem ecopath of pre-reservoir technology in the plain inner river network region from the aspect of environmental ecology. Through background research for pre-reservoir ecology and the selection for species of ecosystem ecopath, ten kinds of hydrophyte, including typha latifolia L. phragmites communis trin, vallisneria asiatica miki, scirus validus vahl, pistia stratiotes linn, acorus calamus linn, hydrilla verticillata (Linn.f.) royle, zizania latifolia (Griseb.) stapf, lemna minor linn, and potamogeton crispus, and five kinds of fishes, including hypophthalmicthys molitrix, aristichthys nobilis, ctenopharyngodon indella, parabramis peckinensis, and plagiognathops microlepis, can be arranged in the biotic community that can be man-controlled in ecosystem and build pre-reservoir water ecosystem, the whole ecosystem not only have the ability to wipe off the nutrient, but also can make itself stable.This article uses software of ecopath with ecosim 5.1 to mimic built ecosystem and classify the model of pre-reservoir water ecosystem seven functional groups: phytoplankton, hydrophyte, zooplankton, herbivorous, omnivorous, polychaetes and detritus. By inputing each group's important ecological parameters:Biomass, Production/Biomass, Consumption/Biomass, Trophic level and Ecotrophic Efficiency, the soft analysed the energy flowing process in the ecosystem, the total net primaryproduction/sum of all respiratory flows is 1.314. The datas shows that water ecosystem in reservoir region is balanced and stable.The ecosystem's designing and mimic result provide theory evidence and technic supporting for probation engineering of pre-reservoir.