1. Introduction
Jialing River is a tributary with the largest drainage area of Yangtze River System. National traffic
development strategy plans to construct 16 interrelated multistage Navigation-power Junction Projects
from the north to the south of Jialing River, 3 projects of which are in Nanchong City——Fengyi
Navigation-power Junction, Xiaolong Navigation-power Junction and Qingju Navigation-power Junction.
While playing an active part in local economic development, hydroelectric development also has a
negative impact on the ecological environment of drainage area, biological diversity and water quality.
The water quality of Jialing River is not only related to sustainable development of both sides, but also
one of the important factors concerning water environment safety in reservoir area of Three Gorges.
Great importance is attached to environmental effect of hydroelectric project at home and abroad, and
there are also lots of researches concerning environmental effect of water ecology. As for the water
environment condition in Nanchong of Jialing River, at present there are only the physicochemical