变权综合营养状态指数(TLI_(CW))评价方法及其在三峡库区支流龙河的应用  

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

作　　者：韩雪梅[1] 富国[1] 刘庆庆[1] 张深 赵健[1] HAN Xuemei;FU Guo;LIU Qingqing;ZHANG Shen;HAO Jian(Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Research Institute of Coal Chemistry,CCTEG Coal Research Institute,Beijing 100013,China)

机构地区：[1]中国环境科学研究院,北京100012 [2]煤炭科学技术研究院有限公司煤化工分院,北京100013

出　　处：《环境工程技术学报》2018年第6期627-634,共8页Journal of Environmental Engineering Technology

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07301003;2012ZX07506008)

摘　　要：针对加权平均综合营养状态指数[TLI(Σ)]评价方法对叶绿素a(Chla)、总磷(TP)、总氮(TN)、透明度(SD)、高锰酸盐指数(COD_(Mn)) 5项评价指标取平均值导致评价结果存在偏差的问题,分析了不同评价指标在不同湖泊状况(氮限制、磷限制、氮磷协同效应)时表达营养水平的效力,提出了选择Chla、TP和TN作为评价指标,通过比较显势和潜势营养状态指数得到综合营养状态指数的变权综合营养状态指数(TLI_(CW))评价方法,并在三峡库区支流龙河库湾进行评价应用。结果表明,TLI_(CW)方法(多湖响应关系)评价的多年平均营养状态为轻度富营养,TLI(Σ5)方法为中营养,TLI_(CW)评价结果更能突出富营养化状态风险特征;采用多湖响应关系确定的TLI_(CW)评价结果较采用龙河响应关系确定的TLI_(CW)高1个营养等级,且龙河响应关系确定的TP和TN营养物浓度临界阈值分别是多湖响应关系的2. 75和3. 00倍,说明多湖响应关系用于龙河富营养化评价存在明显的过保护问题。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 COD Mn.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(TLI CW)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 TLI CW 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 TLI CW method while in the status of mesotrophication by TLI(Σ)method.The TLI CW 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.

关 键 词：富营养化 营养状态 潜势指标 显势指标 三峡库区 

分 类 号：X524[环境科学与工程—环境工程]