Spatial Pattern of Dissolved Nitrogen in the Water on Receiving Agricultural Drainage in the Sanhuanpao Wetland in China

The total nitrogen (TN) increases and the water quality deteriorates when a large amount of nitrogen-containing is discharged from farmlands into wetlands. This research on relationship between TN, ammonia (NH4-N), nitrate (NO3-N) concentrations in has certain reference significance for understanding spatial pattern removal Taking Sanhuanpao wetland northeast China as object, 24 sampling plots study area were sampled spring summer 2017 to test NH4-N, NO3-N. Based calculations change rates NO3-N summer, step-by-step elimination analysis was carried out removals revealed by gradual buffer extrapolations, combined with stepwise fitting functions. results show that capacity NH4-N strong within range 14.55 km–20 km 26.93 km–35.96 inlet, relatively km. areas are not geometric center wetland, but separate narrow around center. TN along channel direction only 0.25 times higher than perpendicular channel, indicating regardless whether wetlands expanded or difference small. Effectively monitoring managing reception agricultural drainage extremely important maintaining water-purification function aim reveal law water, provide framework studying mechanism nitrogen.