A review of nitrogen and phosphorus export to waterways: context for catchment modelling
Date
2006
Authors
Drewry, John
Newham, Lachlan
Greene, Richard
Jakeman, Anthony
Croke, Barry
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CSLI Publications
Abstract
This paper reviews knowledge of nitrogen and phosphorus generation from land use and export to waterways, including studies relevant to Australia. It provides a link between current and future modelling requirements, and the context for incorporation of this knowledge into catchment models for use by catchment managers. Selected catchment models used by catchment managers are reviewed, and factors limiting their application are addressed. The review highlights the importance of dissolved N and P for overland flow and groundwater pathways, for sheep, beef and dairy grazing land use. Consequently, the effectiveness of riparian buffers to remove N and P may not be adequate. Consideration of the effects of rainfall and hydrology, dissolved P and N losses from pastures and event-based catchment-scale loads are therefore important factors that should be incorporated into catchment models. The review shows that it is likely that nutrient losses under Australian dairying conditions have many similarities to worldwide studies. Catchment models need to represent the importance of event-based loads, intensively farmed land use, management and forms of nutrients. Otherwise there is a likelihood of either underestimating nutrient losses, or potentially overestimating the effectiveness of riparian buffers.
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Keywords
Keywords: catchment; grazing management; land use; livestock farming; nitrogen; nutrient loss; phosphorus; soil nutrient; Australasia; Australia; Ovis aries Conceptual model; Export coefficient; Nutrient export; Overland flow
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Source
Marine and Freshwater Research
Type
Journal article
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Restricted until
2037-12-31
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