Modelling nitrogen flows in peri-urban vegetable field plots in Nanjing, China
Many parts of China are going through a rapid development and urbanization resulting in various environmental impairities. The Yangtze Delta Region surface water bodies are affected by eutrophication, partly caused by diffuse losses from agriculture. In this study, nitrogen, and to some extent al...
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| Formato: | Otro |
| Lenguaje: | sueco Inglés |
| Publicado: |
2005
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| Materias: | |
| Acceso en línea: | https://stud.epsilon.slu.se/11860/ |
| Sumario: | Many parts of China are going through a rapid development and urbanization resulting
in various environmental impairities. The Yangtze Delta Region surface water bodies
are affected by eutrophication, partly caused by diffuse losses from agriculture. In this
study, nitrogen, and to some extent also phosphorus, flows and losses from two plots in
an intensively cultivated vegetable field in a peri-urban area of Nanjing, with a high
input of organic fertilizer, were analysed by the use of the field-scale simulation model
GLEAMS. The GLEAMS model was parameterized and calibrated against measurements of soil water and nitrogen content in two plots. A scenario with a reduced input of nitrogen was then simulated.
The resemblance between simulated and measured water content in the different soil
layers was quite poor. The simulated inorganic nitrogen content in the soil was
significantly lower than the measured during great parts of the simulation period. This
could be due to an inappropriate simulation of the mineralization of organic N under
these conditions, or an underestimated decomposition rate of manure. It is also possible
that the poor water simulations contributed to the underestimated inorganic N content in
the soil. There were similar results for the two plots, except for an unexplained 20%
increase in leaching and erosion losses of N in Plot B. For simulation of scenarios to
find best management practices, the model parameterization should be further refined. |
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