Nitrogen cycle in the hyporheic zone of natural wetlands  

作　　者：Nianqing Zhou Shan Zhao Xinping Shen 

机构地区：[1]Department of Hydraulic Engineering, Tongji University [2]Key Laboratory of Yangtze River Water Environment, Ministry of Education [3]Dongting Lake Water Resources Administration Bureau of Hunan Province

出　　处：《Chinese Science Bulletin》2014年第24期2945-2956,共12页

基　　金：supported by the National Natural Science Fund of China (41272249);the Research Fund for the Doctoral Program of Higher Education of China (20110072110020)

摘　　要：Nitrogen(N)is one of the most important components and ecological factors for natural wetland ecosystems.It is mainly derived from runoff input,atmospheric deposition,and biological N fixation.The transport and transformation of N in natural wetlands primarily occur in the hyporheic zone(HZ),a buffer area of intensified biogeochemical activity that is often regarded as the sink,source,and converter of N in wetlands.The main ways of N attenuation in the HZ are denitrification,anaerobic ammonia oxidation(anammox),and wetland plant adsorption.The effects of internal and human factors on the N cycle are illustrated in this article.The results indicate that N sources are influenced by human factors such as agricultural activities and fossil combustion,while N attenuation is affected by internal factors,including oxygen concentration,carbon and phosphorus availability,pH and Eh changes,and microorganism actions.Finally,some research trends are provided to get a better understanding of the N cycle in the HZ of natural wetlands.This study may provide a clear perspective of N cycle in the HZ and their interactions between various factors.Nitrogen （N） is one of the most important components and ecological factors for natural wetland ecosystems. It is mainly derived from runoff input, atmospheric deposition, and biological N fixation. The transport and transformation of N in natural wetlands primarily occur in the hyporheic zone （HZ）, a buffer area of intensifted biogeochemical activity that is often regarded as the sink, source, and converter of N in wetlands. The main ways of N attenuation in the HZ are denitrification, anaerobic ammonia oxidation （anammox）, and wetland plant adsorption. The effects of internal and human factors on the N cycle are illustrated in this article. The results indicate that N sources are influenced by human factors such as agricultural activities and fossil combustion, while N attenuation is affected by internal factors, including oxygen concentration, carbon and phosphorus availability, pH and Eh changes, and microorganism actions. Finally, some research trends are provided to get a better understanding of the N cycle in the HZ of natural wetlands. This study may provide a clear perspective of N cycle in the HZ and their interactions between various factors.

关 键 词：自然湿地 氮循环 流带 ANAMMOX 湿地生态系统 生物地球化学 氧化还原电位 人为因素 

分 类 号：P595[天文地球—地球化学]