Dongting Lake Eco Environment Monitoring Center

Yueyang, China

Dongting Lake Eco Environment Monitoring Center

Yueyang, China

Time filter

Source Type

Tian Z.-B.,Chinese Research Academy of Environmental Sciences | Wang L.-J.,Chinese Research Academy of Environmental Sciences | Li X.-B.,Chinese Research Academy of Environmental Sciences | Zheng B.-H.,Chinese Research Academy of Environmental Sciences | And 2 more authors.
Research of Environmental Sciences | Year: 2014

Characteristics analysis of pollutant influx and outflux is important to examine the relationship between Dongting Lake and the Yangtze River, as well as Dongting Lake and its upstream rivers. Based on hydrological and water quality data in the main monitoring sections in 2010, pollutant influxes from four upstream branches (Xiang, Zi, Yuan and Li) and three water inlets (Songzi, Taiping and Ouchi) were calculated for Dongting Lake. The pollutant outflux of Chenglingji outlet was studied as well. Furthermore, spatial-temporal variations and source contributions of pollutant flux were analyzed. The results showed that the pollutant influxes of CODMn, NH4 +-N (ammonia nitrogen) and TP (total phosphorus) through the four upstream branches and three water inlets were 44.47×104, 67.49×103 and 15.03×103 t, respectively. The total outfluxes of CODMn, NH4 +-N and TP were 73.69×104, 82.46×103, 21.88×103 t in 2010. As for the temporal distributions, uneven monthly pollutant influx during the year was found. A peak value was observed from June to July, which was affected by the characteristics of precipitation and the water flow. The influxes of the three water inlets were significantly correlated with the scheduling operation process of the Three Gorges Reservoir. As for the spatial distribution, the pollutant load of Dongting Lake was mainly from the four rivers system (82.82%-87.54%), with the greatest contribution from the Xiang and Yuan Rivers. The three water inlets in connection with the Yangtze River only contributed 12.46%-17.18% of the total pollutant influx. In addition, more information was achieved based on further analysis of historical documents. Comparing data from 2010 (after the Three Gorges Dam was built) with 1999-2002 (before the dam was built), the runoff from the three water inlets was reduced by one-third, and the influxes of CODMn, NH4 +-N and TP were reduced 49.27%-53.19%. However, the characteristics and influence of the change still requires long-term observation and further study. In addition to the four upstream rivers and three water inlets, the runoff around the lake area and precipitation on the surface of the lake also affects the pollutant influx, but the contribution from them is relatively small. For pollution prevention in Dongting Lake, controlling the pollutant influxes from the upstream rivers and water inlets should be the first focus, while non-point source pollution control around the lake area should also be strengthened.


Wang L.-J.,Chinese Research Academy of Environmental Sciences | Wang X.,Chinese Research Academy of Environmental Sciences | Liu L.-S.,Chinese Research Academy of Environmental Sciences | Zheng B.-H.,Chinese Research Academy of Environmental Sciences | And 3 more authors.
Research of Environmental Sciences | Year: 2013

Three hundred and sixty water samples were collected from the Dongting Lake from January to December in 2011. The physio-chemical factors of water samples including pH, DO, BOD5, TP, CODMn, CODCr, NH3-N, TN, fecal coliform and Chla were measured and analyzed by methods of the principal component analysis. The results showed that DO, BOD5, TP, CODMn, CODCr, TN, NH3-N and Chla were the main impact factors of the water quality at Yugongmiao and Lujiao. The other sectoins, Nanzui, Muping Lake, Heling Lake and Wanzi Lake were greatly influenced by the concentration of TP, while Xiaohezui was mainly influenced by concentrations of TP, BOD5 and Chla. The East-Dongting Lake was mainly influenced by concentrations of BOD5 and Chla. In contrast, Yueyanglou and Dongting Lake outlet were much influenced by concentrations of DO, CODMn, CODCr, NH3-N and TN. Results with the scores of integrative principal component showed that the order of pollution degree in the sampling sections was as follows: Yugongmiao > Lujiao > East-Dongting Lake > Yueyanglou > Dongting Lake outlet > Nanzui > Hengling Lake > Muping Lake > Xiaohezui > Wanzi Lake.


Wang X.,Chinese Research Academy of Environmental Sciences | Zheng B.-H.,Chinese Research Academy of Environmental Sciences | Liu L.-S.,Chinese Research Academy of Environmental Sciences | Wang L.-J.,Chinese Research Academy of Environmental Sciences | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

This research was performed in 2010 at 6 sections of Dongting Lake, aiming to investigate the structure of macroinvertebrate communities. A total of 40 macroinvertebrate taxa belonging to 3 phyla were identified. The macroinvertebrate abundance ranged from 16 to 320 ind/m2 and obviously different across the sampling sections in the three seasons, for example, Nanzui had the highest and Muping Lake had the lowest mean macroinvertebrate abundance across the 6 sampling sections. The macroinvertebrate community was dominated by Mollusca, and significant difference was found on macroinvertebrate composition across 6 sampling sections. Overall, Shannon-Wienner diversity varied from 0.95 to 2.22, while Margalef diversity varying from 0.75 to 1.99. Canonical correspondence analysis (CCA) was applied to explore the relationship between macroinvertebrate community and environmental parameters. pH and dissolved oxygen (DO) were the most important factors influencing the distribution of macroinvertebrate species across the 6 typical sections, for example, Bellamya puificata, Bellamya aeruginosu, Semisulospira cancellata, Corbicula fluminea, Alocinma longicornis, Aulodrilus prothecatus and Gammarus were chiefly influenced by pH, while Tendipes plumosus, Stictotenddipes sp., Branchiura sowerbyi, Limnodrilus hoffmeisteri and Limnodrilus grandisetosus were chiefly influenced by DO, and Psectrocladius was chiefly influenced by both pH and DO. Furthermore, the other factors just like biochemical and chemical oxygen demand, total phosphorus (TP), total nitrogen (TN) and ammonia nitrogen (NH3-N) were also important to the macroinvertebrate species.

Loading Dongting Lake Eco Environment Monitoring Center collaborators
Loading Dongting Lake Eco Environment Monitoring Center collaborators