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Establishment of stream nutrient criteria by comparing reference conditions with ecological thresholds in a typical eutrophic lake basin†
Environmental Science: Processes & Impacts ( IF 5.5 ) Pub Date : 2017-10-24 00:00:00 , DOI: 10.1039/c7em00074j
Xiaofeng Cao 1, 2, 3, 4 , Jie Wang 5, 6, 7, 8 , Dalin Jiang 1, 2, 3, 4 , Jinhua Sun 4, 9, 10 , Yi Huang 1, 2, 3, 4 , Shengji Luan 2, 4, 11, 12
Affiliation  

The establishment of numeric nutrient criteria is essential to aid the control of nutrient pollution and for protecting and restoring healthy ecological conditions. However, it's necessary to determine whether regional nutrient criteria can be defined in stream ecosystems with a poor ecological status. A database of periphytic diatom samples was collected in July and August 2011 and 2012. In total 172 samples were included in the database with matching environmental variables. Here, percentile estimates, nonparametric change-point analysis (nCPA) and Threshold Indicator Taxa ANalysis (TITAN) were conducted to detect the reference conditions and ecological thresholds along a total nitrogen (TN) and total phosphorus (TP) gradient and ammonia nitrogen (NH3-N) for the development of nutrient criteria in the streams of the Lake Dianchi basin. The results highlighted the possibility of establishing regional criteria for nutrient concentrations, which we recommended to be no more than 1.39 mg L−1 for TN, 0.04 mg L−1 for TP and 0.17 mg L−1 for NH3-N to prevent nuisance growths of tolerant taxa, and 0.38 mg L−1 for TN, 0.02 mg L−1 for TP and 0.02 mg L−1 for NH3-N to maintain high quality waters in streams. Additionally, the influence of excessive background nutrient enrichment on the threshold response, and the ecological interaction with other stressors (HQI, etc.) in the nutrient dynamic process need to be considered to establish the eventual nutrient criteria, regardless of which technique is applied.

中文翻译:

通过将典型富营养化湖盆中的参考条件与生态阈值进行比较来建立河流养分标准

建立营养数字标准对于帮助控制营养污染以及保护和恢复健康的生态条件至关重要。但是,有必要确定是否可以在生态状况较差的河流生态系统中定义区域养分标准。2011年7月,2011年8月和2012年8月收集了植物周围硅藻样品的数据库。数据库中总共包含172个具有匹配环境变量的样品。在这里,进行了百分位数估计,非参数变化点分析(nCPA)和阈值指标分类法分析(TITAN),以检测总氮(TN)和总磷(TP)梯度以及氨氮(NH)的参考条件和生态阈值3-N),以发展滇池流域的营养标准。结果强调了我们推荐为不超过1.39毫克的L建立用于营养物浓度区域标准的可能性,-1为TN,0.04毫克的L -1为TP和0.17毫克的L -1为NH 3 -N,防止公害宽容类群的生长,和0.38毫克的L -1为TN,0.02毫克的L -1为TP和0.02毫克的L -1为NH 3 -N,以保持高质量的水域中的流。此外,过量的背景养分富集对阈值响应的影响以及与其他胁迫因子(HQI等)的生态相互作用),无论采用哪种技术,都需要考虑在养分动态过程中建立最终养分标准。
更新日期:2017-10-24
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