松花江区水资源质量评价综述

基于全国第二次水资源调查评价成果,对松花江区地表水资源质量现状进行综合概述。松花江区的地表水体污染严重,以有机污染为主,主要污染指标是CODMn;综合评价水质劣于Ⅲ类的河长占总河长的62.7%;湖泊、水库基本处于中富营养和富营养状态,水质多为Ⅴ类和劣Ⅴ类。汛期污染重于非汛期,面污染源影响大于点污染源;有机污染主要来自农村和田野,城市工业和生活污水也是重要的污染源。

Review on the evaluation of water resources quality in Songhuajiang basin

Based on the evaluation results of the second national water resources investigation,the present situation of water resources quality in Songhuajiang basin was evaluated.The surface water in Songhuajiang basin has been polluted seriously,with organic pollutants as main pollution sources and COD_(Mn) as the main pollution index.The river water,which is worse than the 3rd water quality standard,has covered 62.7% of the total length of the river.Lakes and reservoirs are normally in the mesotrophic or eutrophic status and water quality is almost up to or worse than the 5th water quality standard.The pollution in flood period is more serious than that in other periods,and the influence of non-point pollution sources is larger than that of point sources.Organic pollutants come mainly from rural areas and farmland,and urban industrial wastewater and domestic sewage are also important pollution sources.