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• W4200047776 startingPage "152208" @default.
• W4200047776 abstract "Macrophyte-dominated ponds, widely distributed in lowland areas, play an important role in nitrogen (N) retention for nonpoint source pollution. However, their impacts on N sources and sinks are scarcely quantified at a watershed scale. This study aimed to investigate N dynamics (sources, sinks, transport, etc.) of macrophyte-dominated ponds and their driving factors in a typical lowland artificial watershed (the Zhong River Watershed) in East China. For this purpose, an hourly-scale pond model (nitrogen dynamic model for macrophyte-dominated ponds, NDP-Pond) was developed, and coupled with a daily scale watershed model (Nitrogen Dynamic Polder model, NDP) to simulate N dynamics, and estimate N retention in macrophyte-dominated ponds. A comparison with the measured water level and total nitrogen (TN) revealed an acceptable model performance (coefficient of determination (R2) > 0.53) for these two models. Based on the N source/sink simulations, we found that 1) macrophyte-dominated ponds showed a large TN removal capacity with a rate of 55%, and a TN loading removal rate of 67 kg·ha−1·yr−1. 2) Denitrification was the main pathway for N removal with a contribution of 57.7%, followed by the uptake of macrophytes (35.8%) and sedimentation (6.5%). 3) The optimal coverage of macrophytes (Alternanthera philoxeroides) to enhance N removal is 2–4 kg·m−2. 4) During the macrophyte-growth period, the TN removal capacity of the pond was higher with a retention time of 1–10 days. Increasing the pond retention time would decrease the N removal efficiency. This study revealed the high value of coupling multiscale models to gain in-depth insights into N retention in macrophyte-dominated pond ecosystems." @default.
• W4200047776 created "2021-12-31" @default.
• W4200047776 creator A5019237371 @default.
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• W4200047776 date "2022-03-01" @default.
• W4200047776 modified "2023-09-27" @default.
• W4200047776 title "Characterizing the impacts of macrophyte-dominated ponds on nitrogen sources and sinks by coupling multiscale models" @default.
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• W4200047776 doi "https://doi.org/10.1016/j.scitotenv.2021.152208" @default.
• W4200047776 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34896488" @default.
• W4200047776 hasPublicationYear "2022" @default.
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