CAJ | 학술논문

为全面了解长江下游干流氮素的含量水平，于2014年6月对长江下游干流表层、中层和底层水体中总氮（TN）、溶解性氮（TDN）、氨氮（NH4＋-N）的含量进行检测，分析了氮素的空间分布特征。研究结果表明：TDN是氮在长江下游干流水体中的主要形态，而且表层、中层、底层水体中氮素含量均不相同；长江下游干流水体中TN的含量范围为0．85～2．46 mg／L，表层和底层水体中TN平均含量均高于中层水体中TN的平均含量；水体中TDN的含量范围为0．72～2．08 mg／L，表层水体中TDN平均含量相对较高；水体中NH4＋-N的含量范围为0．13～0．75 mg／L，表层、中层和底层水体中NH4＋-N的含量相近；从研究区域上游至下游，TN和TDN的平均含量呈现上升的趋势；不同城市间的NH4＋-N平均含量波动较大。通过相关性分析还发现，TDN与叶绿素a （Chl-a）呈显著负相关，水温（T）与叶绿素a （Chl-a）呈显著正相关，其它形态氮与水的理化性质无明显相关关系。此研究结果可作为控制长江下游干流水体中氮素污染的基础数据。
위전면료해장강하유간류담소적함량수평，우2014년6월대장강하유간류표층、중층화저층수체중총담（TN）、용해성담（TDN）、안담（NH4＋-N）적함량진행검측，분석료담소적공간분포특정。연구결과표명：TDN시담재장강하유간류수체중적주요형태，이차표층、중층、저층수체중담소함량균불상동；장강하유간류수체중TN적함량범위위0．85～2．46 mg／L，표층화저층수체중TN평균함량균고우중층수체중TN적평균함량；수체중TDN적함량범위위0．72～2．08 mg／L，표층수체중TDN평균함량상대교고；수체중NH4＋-N적함량범위위0．13～0．75 mg／L，표층、중층화저층수체중NH4＋-N적함량상근；종연구구역상유지하유，TN화TDN적평균함량정현상승적추세；불동성시간적NH4＋-N평균함량파동교대。통과상관성분석환발현，TDN여협록소a （Chl-a）정현저부상관，수온（T）여협록소a （Chl-a）정현저정상관，기타형태담여수적이화성질무명현상관관계。차연구결과가작위공제장강하유간류수체중담소오염적기출수거。
In order to obtain the nitrogen concentration in mainstream lower Yangtze river and provide basic data for controlling nitrogen pollution,in June 2014 we detected the concentrations of TN,TDN and NH4+-N in surface, middle and bottom waters of lower Yangtze River,and analysed the spatial distribution characteristics of nitrogen. Results reveal that TDN is the main form of nitrogen in the mainstream of lower Yangtze River,and the concentra-tion of nitrogen varies with the depth of water.The range of TN concentration was 0.85-2.46 mg/L and the average concentrations of TN in surface and bottom waters were higher than that in middle water.The range of TDN concen-tration was 0.72-2.08 mg/L,and the average concentration of TDN in surface was much higher.The range of NH4+-N concentration was 0.13-0.75 mg/L,and the average contents of NH4+-N were similar from the bottom to the surface waters.The average contents of TN and TDN present ascendant trend,and the average content of NH4+-N varies greatly between different cities from upstream to downstream in the study area.Through correlation analysis we also found that TDN is in significant negative correlation with chlorophyll-a (Chl),water temperature (T)is significantly positively correlated with chlorophyll-a (Chl),but the other forms of nitrogen have no obvious correla-tion with water’s physicochemical property.