长江流域资源与环境 >> 2010, Vol. 19 >> Issue (z1): 79-.

• 自然资源 • 上一篇    下一篇

湖北四湖流域农田排水沟渠水质评价

 薛莲, 金卫斌, 天成, 熊勤学, 肖斌   

  1. (长江大学农学院| 湖北 荆州 434025)
  • 出版日期:2010-08-23

WATER QUALITY EVALUATION OF AGRICULTURE DRAINAGE DITCHES IN FOUR LAKES REGION OF HUBEI PROVINCE

XUE Lian, JIN Weibin, AI Tiancheng, XIONG Qinxue, XIAO Bin   

  1. (School of Agronomy,Yangtze University, Jingzhou 434025, China)
  • Online:2010-08-23

摘要:

选取湖北省四湖流域14个农田排水沟渠和总干渠上3个关键节制闸及干渠出口作为样本点,利用GPS进行定点采样测试,分析EC、pH、DO、COD、TN和TP 6项水质指标。采用单因子污染指数法判别沟渠水体的主要污染负荷类型,同时利用内梅罗指数法与模糊综合评判法进行评价分级,以期了解该流域水质现状与水环境空间变化特征。结果表明, DO和TN是水体中的主要污染因子,流域内7857%的排水单元沟渠水体处于轻度污染状态,其中4286%的沟渠水体已达到《地表水环境质量标准》(GB38382002)中Ⅳ类水质级别,污染比较严重。排水单元污染程度由强至弱的排列顺序为:监利段(D03~D07)>洪湖以北(D08~D09)>洪湖西(D10~D12)>江陵、潜江段(D01~D02)>大同湖地区(D13~D14)。总体来说,总干渠水质好于农田排水单元沟渠水质,中区排水单元沟渠水质要劣于下区。

Abstract:

In this study,water samples from fourteen agriculture drainage ditches as well as from three critical check gates,two outlets of main channel of four lakes region in Hubei Province were collected and examined with six physicochemical parameters:electrical conductivity (EC),pH,dissolved oxygen (DO),chemical oxygen demand (COD),total nitrogen (TN),and total phosphorus (TP).Global positioning system (GPS) was used to determine the coordinates of sampling points.In order to identify the main pollution loading types of ditch water,the single factor pollution index was applied.Moreover,Nemero Index and the fuzzy comprehensive evaluation were used to judge the water quality grades,and then to characterize the water quality situation and the spatial variation features of water environment in this basin.The results indicated that DO and TN were 〖JP2〗the main polluting factors.And the proportion of agriculture〖JP〗 drainage ditches in slight pollution was about 7857%,among which 4286% points reached up to the standard requirement of class Ⅳ in《Surface Water Environment Quality Standard》(GB38382002).This showed that the ditches were heavily polluted.The changing intensity of water pollution in agriculture drainage ditches was Jianli section (D03~D07)>the northern area of Honghu (D08~D09)>the west of Honghu county (D10~D12)>Jiangling and Qianjiang section (D01~D02)>the area of Datong Lake (D13~D14).In summary,the water quality in  main channel was much better than that in agriculture drainage ditches,the middle area was worse than the inferior segment in the aspect of water quality of agriculture drainage ditches.〖

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