Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2017, Vol. 53 ›› Issue (2): 369-377.DOI: 10.13209/j.0479-8023.2017.018

• Orginal Article • Previous Articles     Next Articles

Modeling Nutrients Exports by Rivers from Watersheds to River Mouth: Case Study of Beijiang River Basin

Lili LI1, Shengji LUAN2,3,()   

  1. 1. Lee Kuan Yew School of Public Policy, National University of Singapore, Singapore 259774
    2. Key Laboratory for Urban Habitat Environmental Science and Technology of Peking University, Shenzhen 518055
    3. PKU-HKUST Shenzhen-Hong Kong Institution,Key Laboratory of Environmental Simulation and Pollution Control, Shenzhen 518057
  • Received:2015-10-16 Revised:2016-09-06 Online:2017-02-12 Published:2017-03-20
  • Contact: Shengji LUAN

基于NEWS模型的北江流域营养盐输出模拟

李丽丽1, 栾胜基2,3,()   

  1. 1. 新加坡国立大学李光耀公共政策学院, 新加坡 259774
    2. 北京大学人居环境科学与技术重点实验室, 深圳518055
    3. 深港产学研基地环境模拟与污染控制重点实验室, 深圳518057
  • 通讯作者: 栾胜基
  • 基金资助:
    国家国际科技合作专项(2012DFG92020)资助

Abstract:

Global NEWS (Global Nutrient Export from WaterSheds) is an international modeling effort with few Chinese application cases, and this essay applied the model with modifications to Beijiang River Basin, one of the three main sub-basins of the Pearl River, in order to estimate the river basin-level export of multiple nutrient elements and elemental forms from land sources within the river basin to river mouths. A reliable environmental database of Beijiang River Basin was established by literature review and statistics collection, and with the help of ArcGIS technology. Model calibration and verification showed that the Nash-Sutcliffe model efficiency was 0.61 on DIN (Dissolved Inorganic Nitrogen) loads (t/a) exported at the basin mouth, indicating that the model performs reasonably well for DIN. Modelling results show that 1) in 2010, dissolved nitrogen exports (load) from Beijiang River Basin was 37.5 thousand t/a, which was 9.27% higher than that in 2000, with DIN accounting for 83.51% and DON (Dissolved Organic Nitrogen) accounting for 16.49%. 2) In 2010, dissolved phosphorus exports (load) from Beijiang River Basin was 46.3 thousand t/a, which was 30.05% higher than that in 2000, and contained 86.21% of DIP (dissolved inorganic phosphorus) and 13.79% of DOP (dissolved organic phosphorus). 3) Spatially, nutrients exports (load) from Sui River Basin, one of the downstream sub-basins, and nutrients exports (load) from Lian River Basin, one of the midstream sub-basins, were relatively higher than those from other sub-basins, indicating the necessity of controlling nutrient pollution in the two sub-basins. 4) Atmospheric nitrogen deposition was the major source of DIN export load, followed by synthetic fertilizer and biological nitrogen fixation, while animal wastewater discharging was the major source of DIP export load, followed by synthetic fertilizer. The results also show that the NEWS model is applicable to China’s small-to-medium river basins.

Key words: Beijiang River Basin, nutrient exports, agricultural non-point pollution, Global NEWS model

摘要:

以珠江三大支流之一北江流域为研究区域, 应用国际上最新提出的流域营养盐输出模型 Global NEWS, 经调试后, 用其估算北江流域溶解态营养盐的输出总量。通过收集文献统计资料并使用 ArcGIS 软件建立模拟所需数据库。经率定和验证, 发现模型对 DIN 的模拟效率系数是 0.61, 具有一定的可靠性。模拟结果表明: 1) 2010 年溶解态氮的输出总量为 3.75 万 t/a, 与2000年相比增加约 9.27%, 其中溶解态无机氮(DIN)占 83.51%, 溶解态有机氮(DON)占 16.49%; 2) 2010年溶解态磷的输出总量为 4.63 万t/a, 与2000年相比增加约 30.05%, 其中溶解态无机磷(DIP)占 86.21%, 溶解态有机磷(DOP)占13.79%; 3) 北江下游的绥江和中游的连江子流域营养盐输出总量最高, 应重视这些地区的营养盐污染; 4) 北江流域DIN输出量的主要贡献源是大气氮沉降, 其次是生物固氮和化肥施用, 而 DIP 的主要贡献源是养殖废水, 其次是化肥施用。研究结果也表明, 模型对国内中小型流域具有一定的适用性。

关键词: 北江流域, 营养盐输出, 农业非点源, Global NEWS模型

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