罗山自然保护区地下水化学特征研究

Chemical characteristics of groundwater Luoshan Nature Reserve

罗山自然保护区是宁夏中部的水源涵养林区。通过对罗山地下水进行取样分析、综合运用描述性分析、因子分析的方法,对地下水化学成分的统计特征及其在空间上的变化规律进行了分析研究。结果表明:①罗山浅层地下水中HCO3-和SO42-绝对含量较高,为地下水中的主要离子。以罗山为中心,向四周辐射,地下水化学类型特征及演变规律;地下水中的Mg2+、Na+、Cl-、SO42-、NO3-和TDS的相关程度很高,主要是来自沉积砂岩、板岩中的长石、石英和绢云母;区内硫酸根离子、氯离子和水的总硬度普遍超标,咸水区对人体有害的氟化物含量超标,部分微咸水区的氟化物含量超标,淡水区未出现超标现象。

Roshan is a nature reserve at the water conservation forests in the center of Ningxia,water quality,it solves the problem of drinking water nearby villages.Through our investigation the area and its surrounding areas,the groundwater's TDS outside Luoshan nature reserves is generally higher than 1g / L,and high levels of fluoride ion,poor water quality.In order to identify the forming causes of Roshan and chemical characteristics of groundwater and rational utilization of groundwater resources,take the Luoshan Natural reserve for an example,sampling analysis of the groundwater this area,the article comprehensively applies the descriptive analysis,factor analysis,and totally and systematic studies the chemical characteristics of groundwater in Luoshan.The following conclusions: ①the average concentration contained in HCO3-and SO42-of Luoshan shallow groundwater respectively is 239.975 mg/L and 214.725 mg/L,two values are larger,the coefficient of variation is smaller which reflecting their absolute content in groundwater higher and is the major ions in groundwater.② In the Luoshan district and taking regard as the center radiation to the surrounding,the evolution of groundwater type is: SO42-Cl-HCO3-Na Mg type → HCO3-SO4-Ca Na type → SO4-Ca Na Mg type → SO42-Cl-Na Mg type → SO4-Ca Na type.③ The Mg2+,Na+,Cl-,SO42-,NO3-and TDS is high degree of correlation,these ions are mainly from the deposition of sandstone,feldspar of slate,quartz and sericite,The groundwater salinity is mainly composed of high and low these ions to control.④ According to GB5749-2006 'Drinking water health standards' content,there is a significant area of the water chemistry is characterized by sulfate,chloride and total hardness of water generally exceeded,water district harmful levels of fluoride has been exceeded,part of the brackish water zone of excessive fluoride,freshwater phenomenon does not appear excessive.