|WANG Nianmin,TANG Shizhan,LI Zhe,SUN Dajiang,JI Feng,HUA Zhenhe.Status of water quality and succession changes in Lake Wudalianchi in the last 30 years. J. Lake Sci.2016,28(5):1004-1009. DOI:10.18307/2016.0509
|关键词: 水质 富营养化 五大连池
|Status of water quality and succession changes in Lake Wudalianchi in the last 30 years
WANG Nianmin1, TANG Shizhan1, LI Zhe1, SUN Dajiang1, JI Feng2, HUA Zhenhe3
1.Heilongjiang River Fishery Research Institute, Chinese Academy of Fishery Sciences, Harbin 150076, P. R. China;2.Yangtze River Fishery Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, P. R. China;3.Rihe Fishery Co. Ltd. of Wudalianchi, Heihe 164155, P. R. China
|As the second largest volcanic avalanche lake in China, Lake Wudalianchi is a representatively natural water body in high latitude region of China, which is a famous and multifunctional natural landscape. For studying the current situation of water quality (WQ) of lake, changes of WQ during the past 30 years and evaluating the eutrophic grade of the lake, we collected and studied 15 WQ indices on 11 sampling sites of Lake Wudalianchi in the spring, summer, autumn during 2012 and 2013. The results showed that, the WQ parameters of Lake Wudalianchi as shallow lake in the temperate continental monsoon climate zone change intensively in different areas and different seasons and years. The plankton biomass and chlorophyll-a concentration from the Second and Third Ponds are lower than those of the Fifth Pond, probably as the results of reduction of phosphorus, nitrogen and incremental fishery production in the formers. Comparison with the lake WQ indices during 1980s, mass of phytoplankton, total phosphorus and total nitrogen concentrations decrease significantly now, noting that WQ may be tending to better status. However trophic level index of Fifth Pond is exceeding 70 with the 3 times of the 1980s, which is adjacent to severe eutrophication status. The environmental safeguards of Lake Wudalianchi such as relocation of residents, returning farmland to wetland are effective at beginning phase, but individual part of lake remains a bad WQ suggesting a long-term treatment required.
|Key words: Water quality eutrophication Lake Wudalianchi