自然保护地2025，Vol.5Issue(1)：136-146,11.DOI:10.12335/2096-8981.2024012001
外源氨氮输入对星云湖入湖区域表层沉积物-水界面氮迁移和交换通量的影响
Effects of exogenous ammonia nitrogen on nitrogen transport and exchange fluxes at the surface sediment-water interface in the Xingyun Lake
摘要
Abstract
[Objectives]To investigate the effects of exogenous ammonia nitrogen input on nitrogen transport and exchange fluxes at the surface sediment-water interface of the inflow area of Yunnan Plateau Lakes.[Methods]The surface sediment of the Xingyun Lake Fishery Village River inflow area was selected as the research object and(NH4)2SO4 was used as the exogenous ammonia nitrogen.Static sediment culture experiments were conducted to study the effects of different concentrations of ammonia nitrogen addition on nitrogen exchange flux at the sediment-water interface.The experiment was conducted with four gradient experimental groups(4,8,16,32 mg/L)and one blank control group,with the mass concentration of nitrogen in the ammonium sulfate solution serving as the basis for the experimental design.The cultivation period was 30 days.[Results]The results indicated that the average total nitrogen(TN)content in the surface sediment of the Xingyun Lake Fishery Village River inflow area was 2.95 g/kg,with an average single-factor pollution index of 5.36,reaching the severe pollution level in the single-factor pollution index evaluation criteria,posing a high potential ecological risk.The proportion of exchangeable nitrogen(EN)in TN averages 4.94%,indicating a strong nitrogen migration capability.Throughout the experimental period,the exchange flux F(NO3--N)of nitrate nitrogen(NO3--N)in the sediment was consistently positive,indicating a migration characteristic of NO3--N releasing from sediment to water,positively correlated with the concentration of exogenous input ammonia nitrogen(NH4+-N).The higher the concentration of exogenous input NH4+-N,the greater the release of NO3--N from sediment,and vice versa.On the other hand,the exchange flux F(NH4+-N)of NH4+-N gradually changes from positive to negative during the experimental period,ultimately approaching zero,indicating a migration characteristic of ammonia nitrogen being released initially and then precipitated,eventually reaching a dynamic equilibrium state.[Conclusions]The rapid release of NO3--N from sediment in response to high concentrations of exogenous NH4+-N input can result in the continuous accumulation of NO3--N in the water body.This accumulation can result in a deterioration of water quality and the emergence of environmental issues such as eutrophication and algal blooms.Consequently,in the future,it would be prudent to devote attention to the potential for endogenous nitrogen release from sediment in the study area.Further efforts should be made to reinforce the control and comprehensive management of lake runoff pollution to mitigate the water environmental problems caused by NH4+-N input.关键词
外源氨氮/星云湖/沉积物-水界面/氮迁移/氮交换通量Key words
exogenous ammonia nitrogen/Xingyun Lake/sediment-water interface/nitrogen transport/nitrogen exchange flux分类
资源环境引用本文复制引用
栗浩亮,徐继伟,王传澍,高瞻远,徐武美,张勇,徐锐..外源氨氮输入对星云湖入湖区域表层沉积物-水界面氮迁移和交换通量的影响[J].自然保护地,2025,5(1):136-146,11.基金项目
云南省基础研究专项(202201AS070020) （202201AS070020）
云南省重点研发专项(202302AE090017) （202302AE090017）
国家自然科学基金项目(22264025) （22264025）
云南省基础研究计划——重点项目(202401AS070033,202201AS070020) （202401AS070033,202201AS070020）
大学生创新创业训练计划重点支持领域项目(202210681030) （202210681030）
云南师范大学地理学科研流动站开放基金 （）
云南师范大学地理学部博士后科研流动站科研项目 （）
云南师范大学博士后科研启动项目. （）
