摘要
东山岛地下水是岛上居民饮用水、生活用水、农业灌溉、淡水养殖的主要来源.研究东山岛地下水中"三氮"的空间分布特征及其变异规律、污染来源、影响因素,对了解东山岛地下水"三氮"污染状况、"三氮"污染的控制和防治、居民健康风险控制等具有重要的意义.本研究应用地统计学方法分析了东山岛地下水中"三氮"含量的空间变异特征,采用Kriging方法对未观测点进行趋势面分析,并分析了东山岛地下水中"三氮"的污染特征.结果表明,东山岛地下水氨氮和亚硝酸盐氮的含量总体较低,但空间变异性较大,自相关性较差,而硝酸盐氮的含量普遍较高,空间分布表现为中等变异,空间自相关性较好;"三氮"在全岛的空间分布特征相似,浓度高值区均分布在近海陆域;城镇和村庄生活污染和人畜排泄物是东山岛地下水"三氮"污染的主要来源,是东山岛地下水污染控制的首要措施;土地利用类型、土壤类型、地下水埋深、p H、溶解氧、季节和Fe2+等都是影响东山岛地下水中"三氮"迁移转化的要素,是东山岛地下水氮污染治理需要考虑的因素.
In Dongshan Island,groundwater is the main resource of the local residents’ drinking water,domestic water,agriculture irrigation and freshwater aquaculture. This study aimed to investigate the spatial distribution characteristic and its variation pattern of ammonia-N,nitrate-N and nitrite-N in groundwater,as well as its pollution source and influence factors. It is very important to understand the pollution level of ammonia-N,nitrate-N and nitrite-N in groundwater of Dongshan Island,the control and prevention of ammonia-N,nitrate-N and nitrite-N pollution,which is of great significance to the residents’ health. In this study,the spatial variability characteristics of ammonia-N,nitrate-N and nitrite-N concentration in groundwater of Dongshan Island was analysed by geostatistic method,the values of the non-observation points were determined by Kriging method,and the pollution characteristics of ammonia-N,nitrate-N and nitrite-N in groundwater of Dongshan Island was also analyzed. Our results showed that the ammonia-N and nitrite-N concentration in groundwater of Dongshan Island were at low levels,but their spatial variability were high,and their autocorrelation were poor; however,the nitrate-N concentration was general high,its spatial variability was moderate,and the autocorrelation was much good. The distribution characteristics of ammonia-N,nitrate-N and nitrite-N in groundwater of Dongshan Island were similar that the high concentration areas were all located in the coastal land. The domestic pollutants and human and animal wastes from towns and villages were the main sources of nitrogen pollution,which would be the first step to control the nitrogen pollution of Dongshan Island. Land use pattern,soil type,groundwater depth,p H,dissolved oxygen,season,and the existence of Fe2 +were the impact factors that influence the distribution and transformation of ammonia-N,nitrate-N and nitrite-N in groundwater,which could be the considerable factors in the control of nitrogen pollution in groundwater of Dongshan Island.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第9期3203-3211,共9页
Environmental Science
基金
国家海洋局第三海洋研究所基本科研业务专项(海三科2013021)
