Reducing future river export of nutrients to coastal waters of China in optimistic scenarios

Maryna Strokal*, Carolien Kroeze, Mengru Wang, Lin Ma

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

31 Citations (Scopus)

Abstract

Coastal waters of China are rich in nitrogen (N) and phosphorus (P) and thus often eutrophied. This is because rivers export increasing amounts of nutrients to coastal seas. Animal production and urbanization are important sources of nutrients in Chinese rivers. In this study we explored the future from an optimistic perspective. We present two optimistic scenarios for 2050 (OPT-1 and OPT-2) for China. Maximized recycling of manure on land in OPT-1 and OPT-2, and strict sewage control in OPT-2 (e.g., all sewage is collected and treated efficiently) are essential nutrient strategies in these scenarios. We also analyzed the effect of the current policy plans aiming at “Zero Growth in Synthetic Fertilizers after 2020” (the CP scenario). We used the MARINA (a Model to Assess River Inputs of Nutrients to seAs) model to quantify dissolved N and P export by Chinese rivers to the Bohai Gulf, Yellow Sea and South China Sea and the associated coastal eutrophication potential (ICEP). The Global Orchestration (GO) scenario of the Millennium Ecosystem Assessment was used as a basis. GO projects increases in river export of dissolved N and P (up to 90%) between 2000 and 2050 and thus a high potential for coastal eutrophication (ICEP > 0). In contrast, the potential for coastal eutrophication is low in optimistic scenarios (ICEP 

Original languageEnglish
Pages (from-to)517-528
JournalScience of the Total Environment
Volume579
DOIs
Publication statusPublished - 2017

Keywords

  • Animal manure recycling
  • China
  • Current policy
  • Optimistic scenarios
  • River export of dissolved N and P
  • Sewage control

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