四川农业大学学报 ›› 2015, Vol. 33 ›› Issue (04): 415-421.doi: 10.16036/j.issn.1000-2650.2015.04.010

• • 上一篇    下一篇

安家沟流域面源污染空间分布特征

康启燕1, 张富1, 陈瑾2, 张柏林2   

  1. 1. 甘肃农业大学林学院, 兰州 730070;
    2. 甘肃省定西市水土保持科学研究所, 甘肃 定西 743000
  • 收稿日期:2015-11-18 出版日期:2015-12-31 发布日期:2017-02-28
  • 通讯作者: 张富,博士,研究员,水土保持措施配置及环境整治,E-mail:fuzhang001@163.com。 E-mail:fuzhang001@163.com
  • 作者简介:康启燕,硕士研究生。
  • 基金资助:
    甘肃省科技支撑项目:祖厉河流域面源污染机理和治理技术研究(编号:1204FKCA170)

Spatial Distribution Characteristics of Non-point Pollution in the Anjiagou Watershed

KANG Qi-yan1, ZHANG Fu1, CHEN Jin2, ZHANG Bai-lin2   

  1. 1. The College of Forestry in Gansu Agriculture University, Lanzhou 730070, China;
    2. Dingxi Institute of Soil and Water Conservation, Dingxi 743000, Gansu, China
  • Received:2015-11-18 Online:2015-12-31 Published:2017-02-28

摘要: [目的] 揭示安家沟流域面源污染的空间分布特征,为黄土丘陵沟壑区面源污染防治及削减提供理论依据。[方法] 采用浓度法,结合流域内2006-2014年土地利用现状调查、降雨量、径流量等资料,对坡面径流、沟道径流及坝库蓄水的水质进行分析,研究了污染物负荷在坡面-沟道-库区的变化情况。[结果] 结果表明流域主要面源污染物为CODMn、BOD5、NO2-N、NH3-N、TP、F-、TN,坡面污染物总负荷达到2.12kg/hm2,主要来自农地和林地。坡面污染物在随径流向沟道汇集的过程中发生衰减,沟道径流总负荷降低到1.44kg/hm2,衰减率TP(57.15%) > CODMn(45.98%) > NH3-N(39.97%) > TN(38.86%) > F-(35.34%) > NO2-N(9.37%) > BOD5(2.86%)。沟道径流入库蓄积后大部分污染物发生降解,各污染物降解率均在87%以上,降解率TP(99.99%) > NO2-N(98.39%) > BOD5(94.99%) > CODMn(91.41%) > TN(89.80%) > NH3-N(88.86%) > F-(87.41%),TP几乎全部降解。[结论] 研究区内水土保持措施可有效减轻面源污染程度,流域内污染物负荷总体上呈现出坡面径流向沟道径流衰减,沟道径流向库区蓄水降解的趋势。

关键词: 安家沟流域, 面源污染, 空间分布, 衰减率, 降解率

Abstract: [Objective] The aim of the study was to reveal the spatial distribution characteristics of non-point pollution in Anjiagou watershed, and to provide theoretical basis for non-point pollution prevention and reduction in Loess Hilly and gully region. [Method] Based on concentration method and the data of land use, rainfall and runoff from 2006 to 2014 in Anjiagou watershed, the water quality of slope surface runoff, channel runoff and the reservoir storage were analyzed. The dynamics of pollutant load in slope surface-channel-reservoir. [Results] The results showed that the main pollutants in the basin were CODMn, BOD5, NO2-N, NH3-N, TP, F- and TN. The total pollutants load of the slope surface was 2.12kg/hm2, which was resulted mainly from the farmland and forest land. The pollutant was reduced to 1.44kg/hm2 during the slope runoff process. The decay rate of pollutant was TP(57.15%) > CODMn(45.98%) > NH3-N(39.97%) > TN(38.86%) > F-(35.34%) > NO2-N(9.37%) > BOD5(2.86%). Most of pollutants were degraded from channel runoff to storage reservoir. The degradation rate was approximately 78%. The order was shown as followed:TP(99.99%) > NO2-N(98.39%) > BOD5(94.99%) > CODMn(91.41%) > TN(89.80%) > NH3-N(88.86%) > F-(87.41%). TP pollutants were degraded totally. [Conclusion] The measures of soil and water conservation can effectively reduce non-point pollutions In study area. The pollutant load decayed from slope runoff to channel runoff and reservoir storage.

Key words: Anjiagou watershed, non-point pollutions, spatial distribution, decay rate, degradation rate

中图分类号: 

  • X5