摘要
为掌握珠江三角洲地区地下水中铁的时空变异特征及影响因素,分析了375组地下水样品。结果表明:区内地下水铁含量范围0~68.60 mg/L,平均值1.64 mg/L,总体上,深层地下水铁平均值高于浅层,丰水期地下水铁平均值高于枯水期,2013~2016年地下水铁平均值较2005~2006年略有升高。采用空间趋势分析和Spearman相关分析发现,本区地下水铁含量受氧化还原环境和人类活动影响相对较大,氧化还原电位越低,铁含量越高,且铁含量较高点相对集中于人口集中的河网密集区,受水质较差河流补给及农业面源三氮淋溶作用等影响。补给径流条件、pH值和海水入侵对区内地下水铁含量影响相对较小。
In order to understand the spatial and temporal variation characteristics and its influencing factors of the iron in groundwater in the Pearl River Delta region,375 samples of groundwater are analyzed.The results indicate that the iron content ranges from 0 to 68.60 mg/L with an average of 1.64 mg/L in the groundwater of this region.The iron content in the deep groundwater is higher than that in the shallow groundwater.The content in the rain season is higher than that in the dry season.And the average content increases slightly from 2005-2006 to 2013-2016.The spatial trend analysis and Spearman correlation resuls also show that,the iron content in groundwater of this region is strongly affected by the REDOX environment and the human activity.The iron content is higher with a lower REDOX potential.And the high iron content positions are generally in the densely populated brooky areas.These positions are influenced by the polluted river and three nitrogen leaching in the agricultural non-point source area.The recharge runoff and pH value as well as the seawater intrusion have a little impact on the iron content in the groundwater.
作者
刘畅
余香英
郜志云
罗育池
LIU Chang;YU Xiangying;GAO Zhiyun;LUO Yuchi(Guangdong Provincial Academy of Environmental Science,Guangdong 510000,China;Environmental Planning Department of the Ministry of Environmental Protection,Beijing 100012,China)
出处
《环境保护科学》
CAS
2020年第1期97-100,共4页
Environmental Protection Science
基金
生态环境部专项、广东省省级环境保护专项-广东省地下水基础环境状况调查评估资助
关键词
珠江三角洲
地下水
铁
时空变异特征
影响因素
Pearl River Delta
Groundwater
Iron
Spatial and Temporal Variation Characteristics
Influencing Factors
