长江流域资源与环境 >> 2009, Vol. 18 >> Issue (4): 320-.

• 生态环境 • 上一篇    下一篇

三峡水库上游流域非点源颗粒态磷污染负荷研究

刘腊美1| 龙天渝1| 李崇明2   

  1. (1.重庆大学三峡库区生态环境教育部重点实验室| 重庆 400044; 2.重庆市环境科学研究院| 重庆 400020)
  • 出版日期:2009-04-20

ON THE NONPOINT SOURCE POLLUTION OF PARTICULATE PHOSPHORUS IN THE UPSTREAM WATERSHED OF THE THREE GORGES RESERVOIR

LIU Lamei1| LONG Tianyu1| LI Chongming2   

  1. (1.Key Laboratory of EcoEnvironment of Three Gorges Region of Ministry of Education| Chongqing University| Chongqing 400044| China; 2.Chongqing Academy of Environmental Science| Chongqing 400020| China)
  • Online:2009-04-20

摘要:

为有效控制三峡水库上游流域因水土流失产生的非点源颗粒态磷污染,改善库区水质,以美国通用土壤流失方程为基础,从影响土壤流失年际变化的水文条件和人类活动两个主导因素着手,并从地形指数的角度考虑泥沙输移比的空间分布,提出了能反映流域输沙量逐年动态变化的新估算方法。在此基础上,建立了流域颗粒态磷污染年负荷模型。在GIS辅助下,应用所建模型,对研究流域1990~2006年颗粒态磷污染负荷进行了空间分布模拟和定量研究。结果表明:所建年输沙量模型和颗粒态磷年负荷模型有良好的模拟精度;金沙江中下游流域,雅砻江中下游流域和岷江的大渡河流域是颗粒态磷污染的主要源区,嘉陵江流域通过治理水土流失和颗粒态磷流失情况明显好转;“长治”工程后,三峡水库上游流域的颗粒态磷年负荷总体上有下降趋势,近5年的年均负荷为16 482 t/a,比治理初期的1990年减少约37%。

关键词: 三峡水库/水土流失/非点源污染/ 颗粒态磷

Abstract:

Nonpoint source (NPS) pollution of particulate phosphorus (PP) has recently become an important environmental concern in Three Gorges Reservoir. This study aims to identify the contributing zones of sediment and PP pollution in the upstream watershed of Three Gorges Reservoir and quantify the pollution by simulation method. Firstly, a mathematical model of annual sediment yields was proposed based on the Universal Soil Loss Equation(USLE). The proposed model introduced a coefficient according to the influence of hydrology condition and human activities on sediment yield. The spatial and temporal distribution of sediment delivery ratio (SDR) in the model was got by topography index interpolation method. Then, an annual load model of PP pollution was established on the basis of the sediment model. The PP pollution in 1990~2006 was simulated by the model integrated with GIS. The simulation results show that subbasins of middle and lower reaches of Jinsha River, Yalong River and Dadu River are the main sources of the NPS pollution of PP, and the Jialing River subbasin has a relatively low degree of soil and particulate nutrients loss due to the “key erosion prevention project in the upper Yangtze River” program began in 1989. The PP pollution imported into the reservoir has declined since the implementation of the soil loss prevention program. Annual average load in the last five years is 16 482 t/a, which have reduced by about 37 % compared with that of in 1990.

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