N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea |
| |
Authors: | Thi Nguyet Minh Luu Josette Garnier Gilles Billen Thi Phuong Quynh Le Julien Nemery Didier Orange Lan Anh Le |
| |
Institution: | 1. UMR 7619 Sisyphe, UPMC University Pierre & Marie Curie, Box 123, 4 place Jussieu, 75005, Paris, France 2. Institute of Chemistry, Vietnamese Academy of Sciences and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam 3. CNRS, UMR 7619, UPMC Sisyphe Laboratory, Box 123, 4 place Jussieu, 75005, Paris, France 4. Institute of Natural Product Chemistry, Vietnamese Academy of Sciences and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam 5. Laboratoire d’étude des Transferts en Hydrologie et Environnement LTHE, CNRS UMR 5564, UJF, INPG, IRD, BP53, 38041, Grenoble Cx09, France 6. UMR 7618, BIOEMCO, CNRS-IRD, UPMC, University Pierre & Marie Curie, 4 place Jussieu, 75005, Paris, France 7. IWMI-SEA Office, SFRI, Dong Ngac, Tu Liem, Hanoi, Vietnam
|
| |
Abstract: | The Red River Delta (RRD) (Vietnam), a region experiencing rapid population growth, industrialization, and economic development, concentrates 54% of the population of the whole Red River watershed in less than 10% of the basin area. Our study aimed at understanding and quantifying the processes by which the delta affects the nutrient fluxes coming from the upstream watershed before they reach the sea. A comprehensive budget of nitrogen (N), phosphorus (P), and silica (Si) fluxes associated with natural and anthropogenic processes in the terrestrial and hydrological system of the delta was established for five sub-basins of the delta for the period 2000–2006, based on official statistical data, available measurements, and our own sampling campaigns and enquiries. The results show that anthropogenic inputs of N and P brought into the delta area are higher than the amounts delivered by the river from the upstream watershed. However, the amounts of these two elements ultimately delivered to the coastal zone from the delta are lower than the amounts carried by the upstream river, showing extremely efficient retention of both the soils and the delta’s drainage network. For Si (taking into account both dissolved and amorphous solid forms), the retention is much lower. High retention of N and P and low retention of Si in the delta area have up to now protected the coastal zone from severe eutrophication problems. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|