Volume 8 Issue 6
Nov.  2018
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Article Navigation >  Journal of Environmental Engineering Technology  > 2018  >  8(6): 627-634
HAN Xuemei, FU Guo, LIU Qingqing, ZHANG Shen, ZHAO Jian. Changed weight trophic level index method and its application to Longhe tributary of the Three Gorges reservoir area[J]. Journal of Environmental Engineering Technology, 2018, 8(6): 627-634. doi: 10.3969/j.issn.1674-991X.2018.06.083
Citation: HAN Xuemei, FU Guo, LIU Qingqing, ZHANG Shen, ZHAO Jian. Changed weight trophic level index method and its application to Longhe tributary of the Three Gorges reservoir area[J]. Journal of Environmental Engineering Technology, 2018, 8(6): 627-634. doi: 10.3969/j.issn.1674-991X.2018.06.083
shu

Changed weight trophic level index method and its application to Longhe tributary of the Three Gorges reservoir area

doi: 10.3969/j.issn.1674-991X.2018.06.083
  • 1.

    Chinese Research Academy of Environmental Sciences, Beijing 100012, China

  • 2.

    Research Institute of Coal Chemistry, CCTEG Coal Research Institute, Beijing 100013, China

More Information
  • Corresponding author: 赵健 E-mail: zhaojian@craes.org.cn
  • Received Date: 2018-07-21
  • Publish Date: 2018-11-20
    Abstract
  • Aiming at the deviation problem existing in the evaluation method of weighted average comprehensive nutritional status index TLI(Σ), when making by averaging the values of five evaluation indexes, including Chla, TP ,TN, SD and CODMn. The expressing efficacy of nutrient levels of different evaluation indicators under different lake conditions (nitrogen limitation, phosphorus limitation, nitrogen-phosphorus synergistic effect) was analyzed. The three indicators of Chla, TP and TN were selected as evaluation indicators, and the changed weight trophic level index (TLICW) evaluation method for comprehensive nutritional status index was obtained by comparing the apparent and potential nutritional status indexes. The method was applied in the Longhe River, a tributary of the Three Gorges Reservoir area. It showed that the TLICW method with variable weights was more prominent in describing the characteristics of nutritional status than the TLI(Σ) method. It was in the status of light eutrophication evaluated by TLICW method while in the status of mesotrophication by TLI(Σ) method. The TLICW mean value determined by the multi-lake response relationship reveals that Longhe River was one trohpic level higher than determined by the Longhe River response relationship. The eutrophication thresholds of the TP and TN determined by the Longhe River response relationship was of 2.75 and 3.00 times respectively of multi-lake response relationship, indicating that there was a clear over-protection problem when the multi-lake response relationship was used in the eutrophication evaluation of Longhe River.

     

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