The surplus of phosphorus leads to water eutrophication. Huge input of fertilizers in agricultural activities enriches
nutrition in soil. The superfluous nutrient moves easily to riparian water by rainfall and surface runoff; leads to water
eutrophication of riparian wetlands and downstream water; and consequently affects ecological balance. Thus it is
significant to investigate the risk of phosphorus loss in agricultural land, to identify high concentration areas and guide
the management of nutrition loss. This study was implemented mainly in the area of agricultural use in southern Western
Australia, where a three-year period preliminary monitoring of water quality showed that the concentration of different
forms of phosphorus in water had far exceeded the standard. Due to the large scale surface runoff caused by occasional
storms in Western Australia, soil erosion was selected as the main driving factor for the loss of phosphorus. Remote
sensing and ground truth data were used to reflect the seasonal changes of plants. The spatial distribution of available
phosphorus was then predicted and combined with the evaluation matrix to evaluate the loss risk of phosphorus. This
evaluation was based on quantitative rather than qualitative data to make better precision. It could help making decision
support for monitoring water quality of rivers and riparian wetlands.
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