Establishing water quality reference conditions for nutrients, chlorophyll a and Secchi depth for 7 typical lakes in arid and semiarid ecoregion, China

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• 作者：Shouliang Huo ; Chunzi Ma ; Beidou Xi ; Jing Su ; Zhuoshi He…
• 关键词：Reference condition ; Total dissolved solid ; Lake population distribution method ; Trisection method ; Model prediction
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：73
• 期：8
• 页码：4739-4748
• 全文大小：852 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

The increasingly serious lake eutrophication triggers the need for pre-disturbance conditions or historical reference conditions. Establishing nutrient reference condition of lakes in ecoregion is a critical consideration in the development of scientifically defensible aquatic nutrient criteria. Total dissolved solid (TDS) has a significant influence on the growth of algae in arid and semiarid ecoregion (Xinjiang ecoregion) lakes, China. Three methods including lake population distribution, trisection method and multiple regression models were applied to determine reference conditions for seven typical lakes (based on TDS) with respect to total phosphorus (TP), total nitrogen (TN), planktonic chlorophyll a (Chl a) and Secchi depth (SD). Results show that the first two methods have no significant differences in reference values, and the third method can be used as the validation of the first two methods. The values or ranges considered as nutrients reference conditions are given as follows: TP 0.005?mg/L, TN 0.11?mg/L, Chl a 0.86-.96?μg/L, SD 2.69-.50?m for freshwater lakes; TP 0.005?mg/L, TN 0.58-.69?mg/L, Chl a 0.64-.86?μg/L, SD 2.64-.00?m for saltwater lakes; TP 0.010?mg/L, TN 1.13-.22?mg/L, Chl a 7.00-.60?μg/L, SD 0.43-.45?m for brine lakes. Overall, the obtained reference conditions demonstrate that multiple methods can be used to determine reference condition, and reference conditions for various lake types correspond to oligotrophic, oligotrophic, and mesotrophic status, respectively.