Migration and Transformation of Different Forms of Nitrogen in Surface Sediments and Overlying Water of Xinxiang Yellow River Wetland
It is of great significance to study the spatial distribution of nitrogen pollutants and their migration and transformation at different interfaces to control the pollution of the Yellow River wetland ecosystem.In this project,10 representative samples of Chenqiao wetland in Xinxiang city,Henan province were taken as research objects to analyze the distribution characteristics of different forms of nitrogen in sediments and overlying water,as well as the migration and transformation of nitrogen in sediments and overlying water.The results show that the TN concentration in wetland water ranges from 0.78 to 1.43 mg·L-1,of which NO3-N is the highest,accounting for 48.13％of TN.The distribution trend of NO3--N,NO2--N and NH4+-N is generally consistent with that of TN,and the four variables all belong to moderate variation in space.pH,Eh and EC have great influence on NH4+and NO3-distribution,respectively.The main form of nitrogen in sediments is NH4+-N.NH4+-N is the main migration state of nitrogen.During the migration process,the increase of DO content in overlying water promotes the nitrification reaction and promotes the transformation of NH4+-N into NO3--N in overlying water.The above results are helpful to further understand the different occurrence forms and distribution characteristics of nitrogen pollutants in the Yellow River wetland.
万方数据
维普
