太湖东部湖区水源地水环境时空变化特征

Study on the Water Environmental Characters for Spatial and Temporal Variations in the Eastern Taihu Lake

研究了太湖东部湖区水源地巡查期间(2015年4月—2015年10月)水环境时空变化特征,监测数据表明,太湖东部湖区水源地水环境季节变化明显,空间分异显著。(1)太湖东部湖区水源地总测次中未发现蓝藻感官状态占大半数,水体为中度营养状态,N、P营养盐浓度尚未达到蓝藻水华的适宜范围,总体水环境状态尚佳。(2)水源地藻密度值整体呈夏季单峰型,春季平均藻密度最小,夏季藻密度变幅相比较大,出现极大藻密度值,秋季平均藻密度最高。(3)各水源地蓝藻状态空间差异显著,金墅和上山村水源地相比渔洋山和浦庄寺前水源地发生蓝藻状态频率较高,并且前两者N、P营养盐等水生态环境参数的距平系数均为正值,相比后两者水生态环境较差,浦庄寺前水源地由于水生植物茂盛,水环境最佳。

Based on the water quality investigation from April of 2015 to October of 2015 in the eastern Taihu Lake,the temporal and spatial variations of water environmental characters were analyzed.The water environmental condition of the eastern Tai Lake has greatly changed spatially and seasonally.No cyanobacterial status accounted for the majority.According to the eutrophication evaluation standard,the trophic statue was classified to mesotro-phic status,the concentrations of TN and NH4+-N and TP were below suitable nutrient concentrations of cyanobacterial bloom.Algal density showed a significant seasonal variations with one concentration peak occurred in summer.Cyanobacterial status in the drinking water conservation areas were significant different,Cyanobacterial status in Jinshugang and Shangshancun water conservation areas were found frequendy higher than that in Yuyangs-han and Puzhuangsiqian water conservation areas,and the numbers of water nutrients in the former two were more than those in the latter two.