菹草种群对湖泊水质空间分布的影响  

Influences of Potamogeton crispus Population on the Lake Water Quality Distribution

作　　者：王锦旗[1] 郑有飞[1] 王国祥[2] 

机构地区：[1]南京信息工程大学环境科学与工程学院,南京210044 [2]南京师范大学地理科学学院.南京210097

出　　处：《环境科学》2011年第2期416-422,共7页Environmental Science

摘　　要：对南京玄武湖菹草种群内外水体进行了26 h连续理化指标监测及分析,研究菹草种群对湖泊水体的环境效应.结果表明,表层水体DO最高值(11.85 mg/L)、最低值(9.90 mg/L)均出现在种群内,种群外水域DO含量随与种群距离增加而递减;种群内及开阔水域表层与底层DO差异较小,而种群与开阔水域交界处表层与底层DO差异较大.pH值自种群内向开阔水域递减,表层水体种群内pH最高值达10.3,种群外最低值仅9.2;种群内表层水体pH高于底层,而开阔水域无梯度差异.水体TDS含量随与种群距离增加而升高,种群外表层水体最高达216.9 mg/L,种群内最低仅为177.7 mg/L;表层水体TDS均低于底层.TN、NO 2--N、NO 3--N含量自种群内向开阔水域递增,种群内TN均低于2.00 mg/L,种群外均高于2.00 mg/L,种群内NO 2--N均低于0.026 mg/L,种群外均高于0.026 mg/L,种群内NO 3--N均低于1.25 mg/L,种群外大部分高于1.25 mg/L,表层水体TN、NO 2--N、NO 3--N低于底层,但差异均不显著(p>0.05);NH 4+-N含量种群内外及垂直差异均无明显规律性.表层水体TP、PO34--P含量种群内低于种群外,种群外表层TP、PO43--P最高点较种群内最低点分别高出90.9%、69.64%,种群内底层水体TP、PO34--P含量显著高于表层,种群外表层与底层水体TP、PO43--P含量垂直差异不显著.菹草种群对湖泊水体水质起到一定改善作用.A continuing 26-hour monitoring is given on the physical and chemical indicators of the water around the Potamogeton crispus population in Xuanwu Lake,Nanjing City to study the consequent environmental effects.The result shows that both the highest（11.85 mg/L） and the lowest（9.90 mg/L） DO concentrations occur in the population,while the DO concentration decreases with increasing distance from the population.The DO concentration difference of the surface and bottom waters within the population and the open waters is slight,yet it is more obvious in the junction between the population and the open waters.The pH value declines from the population to the open waters.The maximum pH value of the surface water within the population is 10.3,and the minimum value outside the population is 9.2.The pH value of surface water is higher than the bottom within the population,but there is no such difference in the open waters.The TDS content increases with increasing distance from the population,which shows the maximum is 216.9 mg/L of the surface water and the minimum is 177.7 mg/L outside the population.The TDS value of the surface is lower than that in the bottom.The TN,NO 2--N,NO 3--N contents also increase with the increasing distance from the population,in that the TN content is lower than 2.00 mg/L within the population while the outside is higher than 2.00 mg/L;the NO 2--N content is less than 0.026 mg/L within the population while the outside is higher than 0.026 mg/L;the NO 3--N content is lower than 1.25 mg/L within the population while the outside is mostly higher than 1.25 mg/L.The TN,NO 2--N,NO 3--N contents of the surface water are lower than those in the bottom,but the difference is insignificant（p 0.05）.There is no significant difference of the NH 4＋-N content between the inner population and the external and the surface and the bottom.The TP and PO34--P contents of the surface water are lower than those in the bottom within the population,in that the TP,PO43--P contents of the highest point of the

关 键 词：湖泊 菹草 种群 溶解氧 氮 磷 

分 类 号：X171.4[环境科学与工程—环境科学]