Abstract：
Human activity factors have a significant impact on changes in ammonia nitrogen (NH3-N) content in rivers. Existing research mainly focuses on human activity factors as type factors, and lacks research on the key factors affecting river NH3-N among human activity factors. Therefore, this paper aims to study the key factors affecting human activities on NH3-N in the Huaihe River through various statistical analysis methods. The study found that changes in NH3-N content in the Huaihe River are mainly affected by land use patterns in the basin. There are two different ways in which land use affects NH3-N in rivers: direct effects and indirect effects. We also studied the main pathways through which changes in key factors in human activities affect NH3-N in the Huaihe River by constructing a structural equation model. The results showed that crop sowing area and afforestation area have a significant direct effect on NH3-N in the Huaihe River. In addition, crop sowing area and afforestation area can also affect river NH3-N by regulating the amount of nitrogen fertilizer and human excrement. This study is of great significance for understanding how human activities regulate NH3-N content in rivers.
摘要：
人类活动因素对河流氨氮(NH3-N)含量的变化有显著影响。现有的研究主要集中在人类活动因素作为类型因素,缺乏对人类活动因子中影响河流NH3-N的关键因素的研究。因此,本文旨在通过多种统计分析方法研究淮河人类活动对NH3-N的影响。研究发现，淮河NH3-N含量的变化主要受流域土地利用方式的影响。土地利用对河流中NH3-N的影响有两种不同的方式：直接影响和间接影响。我们还通过构建结构方程模型，研究了人类活动中关键因素的变化影响淮河NH3-N的主要途径。结果表明，作物播种面积和造林面积对淮河NH3-N有显著的直接影响。此外,作物播种面积和造林面积也可以通过调节氮肥和人类排泄物的量来影响河流NH3-N。这项研究对于了解人类活动如何调节河流中的NH3-N含量具有重要意义。
