title: How can we reduce phosphorus export from lowland polders? Implications from a sensitivity analysis of a coupled model.
abstract: Phosphorus (P) export from lowland polders has caused severe water pollution. Numerical models are an important resource that help water managers control P export. This study coupled three models, i.e., Phosphorus Dynamic model for Polders (PDP), Integrated Catchments model of Phosphorus dynamics (INCA-P) and Universal Soil Loss Equation (USLE), to describe the P dynamics in polders. Based on the coupled models and a dataset collected from Polder Jian in China, sensitivity analysis were carried out to analyze the cause-effect relationships between environmental factors and P export from Polder Jian. The sensitivity analysis results showed that P export from Polder Jian were strongly affected by air temperature, precipitation and fertilization. Proper fertilization management should be a strategic priority for reducing P export from Polder Jian. This study demonstrated the success of model coupling, and its application in investigating potential strategies to support pollution control in polder systems.
authors.affiliation: Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China.
authors.forename: Jiacong
authors.initials: J
authors.lastname: Huang
authors.affiliation: Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China. Electronic address: gaojunf@niglas.ac.cn.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Gao
authors.affiliation: Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China.
authors.forename: Renhua
authors.initials: R
authors.lastname: Yan
mesh_terms: D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D008956:Models, Chemical; D010758:Phosphorus / Q000032:analysis*; D045483:Rivers; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014876:Water Pollution / Q000706:statistics & numerical data*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: Phosphorus; Polder; Pond; Sensitivity analysis; Soil erosion