Analysis of thechanges of water ecological status in the measure points of typical rivers in the Taihu Lake Basin based on long-term positioning and observation data——Taking themeasure point of the Guanshan bridge of the Daxi river as an example
From 2005 to 2015, the chemical indexes of the upper Daxi River were monitored monthly, and the river habitat status and the large benthic invertebrate condition were monitored in May and September every year respectively. Then we evaluate the water ecological status according to the relevant system document method. Long-term observation shows that the ecological status of water in the measure point of the Guanshan Bridge presents a"V-shaped"change in 11 years, with the lowest point in 2012 and recovery to the level of 2008—2009 in 2015. If there is no additional disturbance in the future, it is expected to return to the level of 2005 in 2020. It is clear that the demersal animals of the biological indexes are molluscs at the measure point of the Guanshan Bridge. The ecological health index of the river water can reflect the water ecological status correctly. The biggest problem of the decline of the water ecological status is the construction and use of the vertical hard revetment.
Taihu Basinlong-term fixed position observationwater ecological condition
NETL
NSTL
万方数据
维普
