为探究纳木错入湖河流尼亚曲氮输送空间格局及判断沿河湿地在河流氮输送中的作用，在2019─2021年生长季监测了该河多个断面流量和氮组分含量并进行分析。结果表明总氮、硝酸盐氮和氨氮含量在断面之间不存在显著差异，但在年际间和月动态存在显著波动。全河段总氮含量在（0.207±0.003）mg·L^-1（±后均为1倍标准误）。湿地微弱地提高了河流总氮（0.022±0.002）mg·L^-1（P<0.05），对硝酸盐氮和氨氮没有明显影响。陆地生态系统沿途补给水分入湖，但总氮含量比纳木错站多年观测报道的大气无机氮湿沉降水平（0.21~0.24 mg·L^-1）略低，比总沉降水平只会更低。据此判断尼亚曲小流域陆地生态系统（包括湿地）并未通过河流向纳木错（净）排放氮元素，而是吸收。

To investigate the nitrogen contribution of terrestrial ecosystems along Niyaqu， a Namco lake-entering river， and to determine the role of wetlands along the river in the riverine system， the spatial pattern of nitrogen transport was monitored and analysed. During the 2019-2021 growing season， we measured flow and nitrogen component concentrations at multiple cross sections along the Niyaqu River. The results showed that locations （or cross sections） had no significant effect on total nitrogen （TN）， nitrate nitrogen， and ammonia nitrogen concentrations， but there were significant fluctuations observed interannually and in monthly dynamics. The mean of TN was （0.207±0.003） mg·L^-1. The wetlands increased TN slightly by （0.022±0.002） mg·L^-1（P<0.05）， but not nitrate nitrogen and ammonia nitrogen. Although terrestrial ecosystems recharge water along the way into the lake， TN throughout the river is slightly lower than the wet deposition level of inorganic N， which was reported to be 0.21-0.24 mg·L^-1 in two multi-year studies at Namco Station. It could be concluded that terrestrial ecosystems along the Niyaqu River do not contribute additional nitrogen to Namco through the river.