环鄱阳湖地区浅层地下水化学特征及成因分析

[目的]分析环鄱阳湖地区浅层地下水化学特征及成因。[方法]于2010年对环鄱阳湖地区7个县市的地下水质状况进行调查,从矿化度、硬度、水化学类型等方面对鄱阳湖区域不同地区浅层地下水质状况进行分析对比,揭示区域浅层地下水质现状及其变化特征与原因。[结果]环鄱阳湖地区地下水质指标除pH外均较好,均属Ⅰ类水质标准;其中南昌市矿化度、硬度、电导率、Na+、K+、Ca2+、Mg2+、Cl-、HCO3-为最高值,都昌县pH和SO42-为最高值,鄱阳县Mg2+和pH为最低值,永修县硬度、K+、Ca2+、SO42-、Cl-为最低值,进贤县Na+、矿化度和电导率为最低值。江西整体经济发展水平不高是环鄱阳湖地区地下水质较好的主要原因;南昌市地下水多项水质指标最大,甚至趋于Ⅱ类水质标准,是由于经济发展水平较高,人类活动起决定性作用。[结论]该研究为区域浅层地下水管理对策提供依据。

Analysis on the Hydrochemical Characteristics of Shallow Groundwater and Cause of Formation around Poyang Lake Area

[Objective] The aim was to analyse the hydrochemical characteristics of shallow groundwater and cause of formation around Poyang Lake area.[Method] The quality of shallow groundwater under seven counties or cities around Poyang Lake area was investigated in 2010,and compared among different regions from salinity,hardness,conductivity,water chemistry type and so forth,so as to reveal the status quo,change characteristics and reasons of shallow groundwater.[Result] Except for pH,other water quality indicators of shallow groundwater around Poyang Lake area were better,attaining Class I water quality standards.Among these regions,the salinity,hardness,conductivity,Na+,K+,Ca2+,Mg2+,Cl-and HCO3-concentration of shallow groundwater in Nanchang city were up to the maximum value,while pH and SO42-concentration were the highest in Duchang County;Mg2+ concentration and pH were the lowest in Poyang County,and hardness,K+,Ca2+,SO42-and Cl-concentration in Yongxiu County reached the minimum value,while Na+ concentration,salinity and conductivity were the lowest in Jinxian County.In addition,the better quality of groundwater around Poyang Lake area was closely related to the low level of economic development in Jiangxi Province.Meanwhile,many water quality indices in Nanchang City reached the maximum value,and even tended to Class Ⅱ water quality standards,which resulted from the hight level of economic development and decisive role of human activities.[Conclusion] The research could provide references for the establishment of management strategies for regional shallow groundwater.