摘要
地下水是敏感和脆弱的环境要素，其演变直接影响着人类的生存和健康。人为因素影响下最严重的地下淡水演变，使浅层地下水氮浓度持续增长，大陆近地表天然水系统中氮失去平衡，浅层地下水成为大陆氮贮存库。天然条件下浅层地下水硝态氮（ＮＯ３－Ｎ）浓度为４．４ｍｇ／Ｌ，δ＾１３Ｎ（ａｉｒ）值≤５‰，受烘便污染的地下水硝态氮（ＮＯ３－Ｎ）浓度可达２０￣７０ｍｇ／Ｌ，δ＾１５Ｎ值为１０‰￣２０‰。
Groundwater is a sensitive and vulnerable environmental factor. Its evolution directly influences the existence and health of mankind. Under the influence of artificial factors, the most severe evolution of fresh groundwater causes the continual growth of nitrogen concentration in the shallow shallow groundwater, the unbalance of the nitrogen in the near surface natural water system of the continent, and makes the shallow shallow to form a nitrogen storing resevoir. Under natural condition, in the shallow groundwater, the nitrate nitrogen (NO3 - N) concentration is 4.4 mg/L, and the 15 N(air) value 5％. for the manure contaminated groundwater, the concentration of nitrate nitrogen(No3 - N)reaches20 - 70mg/L, and the 15 N value 10％ - 20％.
出处
《勘察科学技术》
1999年第1期37-41,共5页
Site Investigation Science and Technology
关键词
地下淡水
氮浓度
地下水
水质污染
fresh groundwater
nitrogen
nitrogen concentration
evolution
