摘要
为探究漓江流域水系发育区域浅层地下水氮磷污染特征,以漓江流域和柳江流域分水岭区域的会仙湿地试区为研究对象,基于2018年11月—2019年11月浅层地下水水质连续监测月数据,使用单因子评价法和模糊综合评价法进行氮磷污染评价,分析会仙试区地下水氮磷(TN、NO^(-)_(3)-N、NH_(3)-N、TP、PO^(3-)_(4))污染时空变化特征及其影响因素。研究结果表明:月尺度地下水氮磷指标类别20.3%为Ⅰ—Ⅲ类,79.7%为Ⅳ—Ⅴ类;各监测井TN超标率为100%,TP、PO^(3-)_(4)和NH_(3)-N次之,超标监测井分别占37.5%、25%、25%,NO^(-)_(3)-N超标情况较少,超标监测井为12.5%;时间变化方面,氮磷浓度的均值和变差系数表现为丰水期>枯水期;降雨量与NO^(-)_(3)-N(r=0.398,p>0.05)、NH_(3)-N(r=0.486,p>0.05)和TP(r=0.517,p>0.05)浓度的相关关系不显著,降雨量与TN(r=0.597,p=0.04)和PO^(3-)_(4)(r=0.691,p=0.013)浓度表现为显著中等正相关关系;空间分布方面,TN和NO^(-)_(3)-N浓度高值分布于农田和居民区附近,NH_(3)-N浓度分布离散程度大,田边、居民区、河边均有高值出现,TP浓度高值区主要分布于地表河流和农田附近。
In order to analyze the characteristics of nitrogen and phosphorus pollution in shallow groundwater in the drainage network development area in Lijiang river basin,the Huixian test area located at the watershed between Lijiang river basin and Liujiang river basin was selected.Based on monthly monitoring data of shallow groundwater quality from Nov.2018 to Nov.2019,the single-factor evaluation method and fuzzy comprehensive evaluation method were used to evaluate N and P pollution(TN,NO^(-)_(3)-N,NH_(3)-N,TP,PO^(3-)_(4)).The characteristics of spatial and temporal changes of N and P pollution of shallow groundwater were studied.The results showed that monthly groundwater N and P indicators were 20.3%forⅠ-Ⅲ,79.7%forⅣ-V.The exceedance rate of TN in the monitoring wells was 100%.TP,PO^(3-)_(4) and NH_(3)-N were next,with 37.5%,25%and 25%respectively.The level of exceeding standard was lower for NO^(-)_(3)-N,with 12.5%exceedance.In terms of time variation,the mean and coefficients of variation of N and P concentrations were higher in wet season than that in dry season.There was no significant correlation between precipitation and concentrations of NO^(-)_(3)-N(r=0.398,p>0.05),NH_(3)-N(r=0.486,p>0.05)and TP(r=0.517,p>0.05).But there was a significant moderate correlation between rainfall and concentrations of TN(r=0.597,p=0.04)and PO^(3-)_(4)(r=0.691,p=0.013).In terms of spatial distribution,higher concentrations of TN and NO^(-)_(3)-N were distributed near agricultural fields and residential areas.The distribution of NH_(3)-N concentration is widely dispersed,and the higher values occurred at the edge of fields,residential areas and riversides.The areas with higher concentrations of TP mainly located by the rivers and farmlands.
作者
李张楠
代俊峰
万祖鹏
谢晓琳
张振宇
潘林艳
韩俊磊
代俊鸽
LI Zhang-nan;DAI Jun-feng;WAN Zu-peng;XIE Xiao-lin;ZHANG Zhen-yu;PAN Lin-yan;HAN Jun-lei;DAI Jun-ge(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base,Guilin University of Technology,Guilin 541006,China;Collaborative Innovation Center for Water Pollution Control and Water Security in Karst Region,Guilin University of Technology,Guilin 541006,China;College of Earth Sciences,Guilin University of Technology,Guilin 541006,China)
出处
《桂林理工大学学报》
CAS
北大核心
2022年第2期484-490,共7页
Journal of Guilin University of Technology
基金
国家重点研发计划项目(2019YFC0507500)
国家自然科学基金项目(51979046,51569007)
广西自然科学基金项目(2018GXNSFAA294087,2018GXNSFAA050022)
广西高校中青年教师科研基础能力提升项目(2018KY0264)。
关键词
氮磷污染评价
浅层地下水
时空特征
显著性
相关性
会仙
nitrogen and phosphorus pollution evaluation
shallow groundwater
spatio-temporal characteristics
significance
correlation
Huixian
