大辽河口营养物基准推导方法

Study of derivation of nutrient criteria for the Daliaohe estuary

河口富营养化与流域氮、磷营养物的输入直接相关,制定河口营养物基准,可用于控制河口及其近岸海域富营养化,为环境管理的科学决策提供依据。大辽河是渤海最大的入海河流之一,河口污染较为严重;本文采用频数分布法、非参数分析法和实验室模拟压力响应关系法探讨大辽河口及近岸海域营养物基准的推导,最终得到大辽河口总氮(TN)、总磷(TP)及叶绿素a(Chl-a)推荐基准值分别为1.008 mg/L,0.067 mg/L和1.175 mg/m^3,以期为大辽河口及其近岸海域富营养化评估和营养物标准制定提供科学依据。

Estuarine eutrophication is closely related to inputs of nitrogen and phosphorus.The establishment of nutrient criteria for estuaries can provide technical support and management decision information to avoid the eutrophication of estuaries and coastal waters and protect sensitive and vulnerable estuary ecosystems.The Liaohe estuary is one of the largest rivers with serious estuarine pollution that discharges into the Bohai Sea.To provide a basis for the governance of the Liaohe estuary,this study used a frequency distribution curve,a nonparametric analysis method,and a laboratory simulated stressor-response relationship method to derive the nutrient criteria,i.e.,total nitrogen(TN)and total phosphorus(TP),and the response variable criteria,i.e.,chlorophyll a(Chl-a)for the Liaohe estuary.The final results are as follows:TN=1.008 mg/L,TP=0.067 mg/L,and Chl-a=1.175 mg/m^3.