中国水利Issue(2)：36-46,11.DOI:10.3969/j.issn.1000-1123.2026.02.005
三峡水库常年回水区表层沉积物中氮素污染特征研究
Pollution characteristics of nitrogen in surface sediments of the perennial backwater area of the Three Gorges Reservoir
摘要
Abstract
To clarify the nitrogen pollution status and endogenous release potential of sediments in the Three Gorges Reservoir,this study focused on the perennial backwater area,where nine typical sampling sites were set up to collect 0–30 cm sediment cores.The contents of nitrogen in various forms and nitrogen transformation rates were determined,and the key influencing factors were analyzed.The results show that:①The average total nitrogen(TN)content in the sediments is 792.13 mg/kg,which is much lower than the heavy pollution threshold and the levels in major lakes in the middle and lower reaches of the Yangtze River,indicating an overall low level of nitrogen pollution.②Nitrogen is mainly in the form of total organic nitrogen(TON),and the proportion of residual nitrogen(RN)in TON exceeds 96%.The nitrogen mineralization rate is low,suggesting high nitrogen stability.③The content of active nitrogen is relatively low,implying a low risk of large-scale nitrogen release in the short term.④Spatially,the TN content in the deep sediments of the upper reservoir area is higher than that in the surface sediments,while in the lower reservoir area,the TN content in the surface sediments is higher than that in the deep sediments,indicating a potential risk of local TN accumulation.⑤pH(ranging from 8.03 to 8.95)is a key influencing factor,showing a significant negative correlation with most nitrogen forms and ammonification rate.Excessively high pH will inhibit nitrogen transformation.In conclusion,the current level of nitrogen pollution in the reservoir sediments is low,and the risk of endogenous nitrogen release is low.However,the accumulation of TN in the surface sediments of the pre-dam section requires more attention.Additionally,pH can be used as a key entry point for regulating nitrogen cycling.This study can provide a scientific basis for the prevention and control of nitrogen pollution in the Three Gorges Reservoir.关键词
三峡水库/常年回水区/沉积物/氮形态/空间分布/矿化速率/内源释放风险Key words
Three Gorges Reservoir/perennial backwater area/sediment/nitrogen form/spatial distribution/mineralization rate/endogenous release risk分类
建筑与水利引用本文复制引用
韩畅,杨文俊,毕胜,胡曼,滕素芬,胡煜,曹慧群..三峡水库常年回水区表层沉积物中氮素污染特征研究[J].中国水利,2026,(2):36-46,11.基金项目
国家自然科学基金重点项目(52130903) （52130903）
中央级公益性科研院所基本科研业务费项目(CKSF2025172/SL). （CKSF2025172/SL）
