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中文摘要：
为研究不同形态氮在内蒙古乌梁素海的时空分布特征及变化规律，运用地质统计学理论分析了乌梁素海不同形态氮浓度的时空变异性。研究表明：在时间上，乌梁素海水体中各监测点总氮平均浓度夏季高，秋季低，而氨氮浓度与此相反，季节性差异较为明显。在空间上，乌梁素海不同形态氮浓度分布呈现出一定的结构性和随机性，较小尺度上影响不同形态氮转化的作用过程可以忽略，不同形态氮都具有中强等级空间相关性，大多数属于强度空间相关性。总之，乌梁素海氮素污染问题已十分严重，主要污染源为河套灌区农田排水、流域内工业废水和生活污水。
英文摘要：
The temporal and spatial variation characteristics of nitrogen are very important for environmental pollution control of lake. Temporal and spatial variation characteristics of different kinds of nitrogen are studied by using the theory of Geostatistics in Wuliangsuhai Lake. The results indicate that average concentration of total nitrogen are higher in summer than in autumn for temporal distribution. On the contrary, the average concentration of ammonia nitrogen are low in summer, In space, concentration distribution of different species of nitrogen shows structural features and stochastic character, smaller-scale effects can be ignored for conversion process of species of nitrogen, spatial correlation is very strong for all different species of nitrogen. In a word, Nitrogen pollution is very serious in Wuliangsuhai Lake, the main pollution source is farm field drainage of the Hetao Irrigation Area, industrial waste water of watershed and domestic sewage.
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