南方沿海地区地下水中氮元素分布特征和成因

Distribution Characteristics and Causes of Nitrogen in Groundwater in Southern Coastal Areas

南方沿海地区人口密集 , 工农业发达 , 淡水资源需求量大 , 地下水的研究具有重要意义。综合运用数理统计、surfer 空间插值、ArcGIS 空间分析等方法 , 探讨南方沿海区域地下水中氮元素分布特征。结果表明:南方沿海地区地下水氮元素的空间分布呈片状分布在山前洪-冲积平原。林地、大型水库所在的丘陵区 , 氮元素含量比较低;区域地下水氮元素的主要存在形式为 NO_(3)^(-)、NH_(4)^(+), 居民区氮元素主要存在形式为 NO_(3)^(-), 耕地区氮元素主要存在形式为 NH_(4)^(+),NO_(2)^(-)含量普遍较低。

The southern coastal areas are densely populated, developed in industry and agriculture, and have a large demand for freshwater resources, so the study of groundwater is of great significance. Comprehensive use of mathematical statistics, surfer spatial interpolation, ArcGIS spatial analysis and other methods to explore the distribution characteristics of nitrogen elements in groundwater in the southern coastal area. The results show that the spatial distribution of groundwater nitrogen in the southern coastal area is flaky in the piedmont flood-alluvial plain. The hilly areas where forests and large reservoirs are located have relatively low nitrogen content;The main forms of nitrogen in regional groundwater are NO_(3)^(-)and NH_(4)^(+), the main form of nitrogen in residential areas is NO_(3)^(-), the main form of nitrogen in cultivated areas is NH;, and the content of NO_(2)^(-)is generally low.