Simulating deep drainage and nitrate leaching on a regional scale: implications for groundwater management in an intensively irrigated area
| Autor: | Lucy Reading, Kiran Bajracharya, Jipu Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Hydrology
Irrigation 0207 environmental engineering Irrigation scheduling Soil Science 04 agricultural and veterinary sciences 02 engineering and technology Groundwater recharge engineering.material Soil type chemistry.chemical_compound Nitrate chemistry 040103 agronomy & agriculture engineering 0401 agriculture forestry and fisheries Environmental science Soil horizon Fertilizer 020701 environmental engineering Agronomy and Crop Science Groundwater Water Science and Technology |
| Zdroj: | Irrigation Science. 37:561-581 |
| ISSN: | 1432-1319 0342-7188 |
| DOI: | 10.1007/s00271-019-00636-4 |
| Popis: | Groundwater management in irrigation areas requires a comprehensive understanding of the interactions between agricultural management practices and the underlying groundwater resource. Unsaturated zone modelling can be used to predict rates of water and solute movement through the soil profile. By incorporating expert knowledge and measured data, it is possible to investigate the relative influence of management vs environmental factors on water and solute movement. The Agricultural Production Systems sIMulator (APSIM) has been applied to simulate the impacts of both environmental factors and agricultural management factors on deep drainage and nitrate leaching in the Lower Burdekin, North Queensland, Australia. Based on the results of this modelling, predicted annual average deep drainage rates were found to be controlled primarily by soil properties, irrigation scheduling, and, to a lesser extent, annual rainfall. The key factors which were found to control nitrate leaching were: irrigation water quality, fertilizer application rates, soil type, crop management, and irrigation scheduling. However, increases in the concentrations of nitrate in irrigation water resulted in a 64-fold increase in predicted nitrate-leaching rates, compared with a 22-fold increase in predicted nitrate-leaching rates associated with increased fertilizer application rates. As significant quantities of nitrate are predicted to be leached below the root zone, the immediate priority should be to increase monitoring of groundwater quality with a focus on quantifying the transport of nutrients to sensitive receptors. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |