WFD Cycle 2 Lake Phytobenthos Classification

This dataset is a subset of "WFD Classification Status Cycle 2" and contains classification data for phytobenthos in lakes. Phytobenthos or diatoms can be used to indicate the ecological status of a lake. A biological index called the Trophic Diatom Index (TDI) is calculated using information about the environmental preferences of the individual diatom taxa present in the sample. The actual (observed) TDI scores are compared with a predicted TDI score (reflecting a lake in pristine condition). The comparison of the observed to expected scores is known as an Ecological Quality Ratio (EQR). EQRs are used to produce a phytobenthos classification (High, Good, Moderate, Poor, Bad) of the water body for Water Framework Directive (WFD) purposes. Attribution statement: © Environment Agency copyright and/or database right 2015. All rights reserved.本数据集为《水框架指令（Water Framework Directive, WFD）第二周期分类状态》的子集，包含湖泊底栖藻类（phytobenthos）的分类数据。底栖藻类或硅藻（diatoms）可用于表征湖泊的生态状况。可基于样本中各硅藻类群的环境偏好信息，计算得到营养硅藻指数（Trophic Diatom Index, TDI）这一生物学指标。将实际观测得到的TDI分值与反映湖泊未受干扰原始状态的预测TDI分值进行比对，该比对结果即为生态质量比（Ecological Quality Ratio, EQR）。依据《水框架指令（Water Framework Directive, WFD）》的相关要求，可通过生态质量比为水体生成底栖藻类分类等级，分为高（High）、良好（Good）、中等（Moderate）、较差（Poor）、极差（Bad）五类。版权与归属声明：© 环境署（Environment Agency）2015年版权及数据库权益保留，所有权利均受法律保护。