长江流域资源与环境 >> 2015, Vol. 24 >> Issue (01): 135-.doi: 10.11870/cjlyzyyhj201501018

• 生态环境 • 上一篇    下一篇

鄱阳湖丰水期不同底质类型下氮、磷含量分析

张媛,望志方,张琍,陈晓玲,刘子潇   

  1. (1.湖北省环境监测中心站,湖北 武汉 430072;2.武汉大学测绘遥感信息工程国家重点实验室,湖北 武汉 430079;3.江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,江西 南昌 330022;4.天津测绘院,天津 300381
  • 出版日期:2015-01-20

CONTENT ANALYSIS OF NITROGEN AND PHOSPHORUS ON DIFFERENT SEDIMENT TYPES DURING WET SEASON IN LAKE POYANG

ZHANG Yuan1, WANG Zhifang1, ZHANG Li2,3, CHEN Xiaoling2, LIU Zixiao3   

  1. (1.Hubei Environmental Monitoring Central Station, Wuhan 430079, China;2.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan 430079, China;3.Key Laboratory of Poyang Lake Wetland and Watershed Research,Ministry of Education,Jiangxi Normal University,Nanchang 330022,China;4.Tianjin Institute of Surveying and Mapping,Tianjin 300381,China
  • Online:2015-01-20

摘要:

以2011年7月份(丰水期)鄱阳湖实测数据为基础,通过不同底质在遥感影像上的光谱特征,将鄱阳湖底质分为沙滩、泥滩和草洲3种类型,并就不同底质类型鄱阳湖水体和底泥总氮(TN)、总磷(TP)含量进行分析。结果表明:(1) 底质类型不同时,鄱阳湖表层水体TN、TP含量以及底泥磷含量平均值:沙滩>泥滩>草洲。底泥TN含量平均值:草洲>泥滩>沙滩。(2)底质为沙滩的站点主要分布在饶河入湖口至都昌段、赣江北支入湖口至星子段和入江水道前段,饶河、赣江高含量氮、磷的输入,以及沿途陆源污染物的排放,可能是沙滩底质表层水体TN、TP含量较高的一个因素;泥滩底质的站点,有一部分分布在星子至湖口段,该区间陆源污染的影响是泥滩底质表层水体TN、TP含量居次原因之一;而底质为草洲时,草洲对水体中氮、磷的吸收使得草洲底质的站点表层水体TN、TP含量最低

Abstract:

Based on the measured concentration of total nitrogen (TN) and total phosphorus (TP) in Lake Poyang, in July,2011, firstly we classified the sediment of Lake Poyang into three categories according to the spectral signatures of different sediments on remote sensing images, which are sand, mudflat, and grassland. Then we analyzed the content characteristics of TN and TP in both water and sediment of different bottom sediment types. The results show as follows. (1) It has different TN and TP content in surface waters on different sediment types, representing a pattern of sand > mudflats > grass. TP content in bottom sediment has the same characteristics of TN and TP in surface water, and the characteristic of TN content in sediment is grass > mudflats > sand. (2) Stations on sandy sediment mainly distributed from Raohe River to Duchang, and from north branch of Ganjiag River to Duchang, and in the first section of upstream channels. It may result in high TN and TP content of station on sandy sediment from the high pollutants of nitrogen and phosphorus from Raohe River and Ganjiang River, and landsourced pollutants along the way. Part of the stations on muddy sediment distributed from Xingzi to Hukou, and landsourced pollutants is one reason that the surface water of station on grassy sediments has a relative high TN and TP content. And it has the lowest TN and TP content in surface water of stations on grassy sediments because of the absorption of nitrogen and phosphorous from water by grass in sediments

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