中文关键词鄱阳湖流域通江湖泊C、N迁移输出通量丰水期枯水期 英文关键词Poyang Lake watershedYangtze River and its connected lakestransport of C and Noutput fluxwet seasondry season

作者	单位	E-mail
陆瑶	中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101 中国科学院大学, 北京 100049	luyao26@mail2.sysu.edu.cn
高扬	中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101 中国科学院大学, 北京 100049	gaoyang@igsnrr.ac.cn
贾珺杰	中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101 中国科学院大学, 北京 100049
宋贤威	中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101 中国科学院大学, 北京 100049
陈世博	北京师范大学环境学院, 北京 100875
马明真	中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101 中国科学院大学, 北京 100049
郝卓	中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101 中国科学院大学, 北京 100049

中文摘要 本文选取鄱阳湖流域内从初级支流到最大干流再到湖区（香溪架竹河赣江鄱阳湖）这一联通水系线路为研究对象，通过对丰水期和枯水期内各级河流对应流域及鄱阳湖湖区内水体中的各形态C、N浓度进行监测，计算各级河流间C、N元素运移通量，探讨鄱阳湖流域水体C、N迁移过程机制和水质参数变化特征，为鄱阳湖流域生态系统的综合健康管理提供科学依据.结果表明：①鄱阳湖通江流域的C、N浓度呈明显季节变化，其中TIC、TOC、TC浓度丰水期较高，而NO₃^--N和DTN浓度枯水期较高.丰水期TC增加的主要原因是TIC增加，丰水期TN主要以非溶解态存在，而枯水期TN主要以DTN中的NO₃^--N形式存在.②鄱阳湖通江流域的C、N输出通量呈明显季节变化，其中香溪各形态C丰水期通量较枯水期小，架竹河、赣江各形态C丰水期通量较枯水期大，香溪、架竹河、赣江流域各形态N在丰水期通量大多较枯水期小，各形态C、N通量与径流量在99%的置信水平上呈极显著正相关关系.③鄱阳湖流域水体参数丰水期COND、TDS、pH小于枯水期，丰水期ORP大于枯水期. 英文摘要 In this study, a connected waterflow watershed system in the Poyang Lake area was selected as the study site, which ranged from the primary tributary to the lake area (Xiangxi River Jiazhu River Ganjiang River Poyang Lake). The aims of the study were to monitor different forms of C and N and evaluate the transport flux of C and N, and then, the transport mechanisms of C and N and the variation characteristics of water quality parameters in Poyang Lake were discussed, with the intent of providing a scientific basis for the comprehensive management of watershed health within the Poyang Lake Basin ecosystem. The main results were as follows. ① The concentrations of C and N in the Poyang Lake watershed exhibited significant seasonal changes, wherein the TIC, TOC, and TC concentrations in the Poyang Lake Basin were higher in the wet season than those in the dry season, and the NO₃^--N and DTN concentrations were higher in the dry season than those in the wet season. The main reason for the increase of TC in the wet season was the increase of TIC. Most of the TN in the wet season was transported by non-dissolved forms of N, while the TN in the dry period mostly was transported by DTN, and the DTN was mostly in the form of NO₃^--N. ② The C and N transport fluxes in the Poyang Lake watershed also showed significant seasonal variation. The C transport flux of Xiangxi River was lower during the wet season than that during the dry season, and the C transport flux of Jiazhu River and Ganjiang River was higher during the wet season than that during the dry season. The various forms of N transport flux in Xiangxi River, Jiazhu River, and Ganjiang River watershed were higher in the wet season than those in the dry season. There was a very significant positive correlation between the flux and runoff at the 99% confidence level. ③ The COND, TDS, and pH in the Poyang Lake watershed were lower during the wet season than those during the dry season, while the ORP in the wet season was higher than that in the dry season.

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