| 摘要: |
| 3S技术的应用，为快速计算生态系统服务价值提供了新的方法。以ArcGIS9.2为平台，构建广西西江流域生态系统减轻集水区出口受纳水体非点源污染服务物质量和价值量评估模型，以总磷（TP）作为指示污染物，模拟2008年流域内每个栅格像元被植被移除而未进入水环境的污染物质量空间分布特征，结合期望水质标准和净化污染物的边际成本计算出服务的价值。结果表明：西江流域的水文敏感区主要集中在地势平缓的区域；磷素关键污染源区分布与水文敏感区相近，主要位于桂林、柳州、南宁、来宾及贵港。当年被西江流域生态系统过滤移除而未进入水环境的磷素污染物质总量达2673.36t•a 1，占关键污染源区指数总量的732%，其中林地生态系统服务价值贡献率最高。流域生态系统对于减轻其出口受纳水体磷素非点源污染服务的总价值为3462.44万元。 |
| 关键词: 广西 西江流域 水文敏感区 关键污染源区 植被移除磷素量 生态系统服务价值 |
| DOI： |
| 分类号:X171.1 |
| 基金项目: |
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| Ecosystem service value supplied by vegetation for avoiding phosphorus pollution within Xijiang River Basin， Guangxi |
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XU Jing1， YIN SenLu1， WU Nan2， LI JunSheng1*， SUN Guang1
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1.State Key Laboratory of Environmental Criteria and Risk Assessment， CREAS， Beijing 100012， China;2.Anhui Academy of Environmental Science， Hefei 230071， China
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| Abstract: |
| The application of 3S technology provides new methodologies for rapid valuation of ecosystem services. On the basis of Geographic Information System（GIS）software package ArcGIS9.2，a model was established to simulate the ecosystem service supplied by the ecosystem within Xijiang River Basin，Guangxi for avoiding the receiving waters from non point source pollution and its economic value. Total phosphorus（TP）was chosen as a pollutant surrogate and the pollutant loading coefficient，as well as the vegetation filtering coefficient of different land use/cover types were used to simulate the spatial patterns of the annual quantity of the pollutant that were prevented from entering the water environment by the vegetation in each cell followed the flow path in watershed in the year 2008. The economic value of the ecosystem service in this model was determined by the expected water quality standard and marginal cost of purifying pollutant. The results showed that the flat regions were the high hydraulic connectivity areas of the watershed of Xijiang River. The farmlands in Guilin，Liuzhou，Nanning，Laibin and Guigang were phosphorus critical source areas（CSA），distributed similarly as the high hydraulic connectivity areas. In 2008，the total of phosphorus prevented from entering the reservoir by vegetation in watershed was 2 673.36 t•a 1，which was 73.2% of the total CSA index. Forest contributes most to this ecosystem service value. The total value of the service for avoiding the receiving waters from phosphorus pollution was 34.6244 million yuan. |
| Key words: Guangxi Xijiang River Basin hydrological sensitive area critical polluted source areas vegetation removal phosphorus content ecosystem service value |
