尼亚曲向纳木错的氮输出及沿河湿地的作用（2019¾2021）*

doi:10.7523/j.ucas.2024.057

摘要/Abstract

摘要： 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,本研究在2019—2021年生长季监测了该河多个断面流量和氮组分浓度并进行分析。结果表明总氮、硝酸盐氮和氨氮浓度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。全河段总氮水平在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,但总氮浓度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）还要略低,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。

关键词: 纳木错, 青藏高原, 氮组分, 河流, 时空特征

Abstract: 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, while year and month did. The mean of TN was in the range of 0.207 ± 0.003 mg N·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.

Key words: Namco, Qinghai-Tibetan plateau, nitrogen fraction, river, spatial and temporal characteristic

中图分类号:

X831

潘佳音, 杜剑卿, 刘强, 吴俣, 周丹妮, 牛之祥, 牛海山. 尼亚曲向纳木错的氮输出及沿河湿地的作用（2019¾2021）^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2024.057.

PAN Jiayin, DU Jianqing, LIU Qiang, WU Yu, ZHOU Dani, NIU Zhixiang, NIU Haishan. Nitrogen export from Niyaqu to Namco and the role of riverine wetlands (2019¾2021)[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.057.

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尼亚曲向纳木错的氮输出及沿河湿地的作用（2019¾2021）^*

Nitrogen export from Niyaqu to Namco and the role of riverine wetlands (2019¾2021)

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