PROGRESS IN GEOGRAPHY ›› 2010, Vol. 29 ›› Issue (11): 1360-1367.doi: 10.11820/dlkxjz.2010.11.022

• Original Articles • Previous Articles     Next Articles

Review of Risk Assessment of Phosphorus Loss Potential from Agricultural Non-point Source: Phosphorus Index

LI Na, GUO Huaicheng   

  1. College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • Received:2009-06-01 Revised:2010-07-01 Online:2010-11-25 Published:2010-11-25


Diffuse phosphorus discharge from agricultural nonpoint sources has become one of the main causes of eutrophication of surface water. Agricultural NPS pollution can be widely distributed and there is an uncertainty in temporal and spatial distribution, so it is difficult to control and prevent it. Now the valid way to improve the efficiency of control is identifying high risk areas of P loss and then making corresponding measurements. PI based on GIS is a simple risk assessment tool and can identify the high risk areas effectively. This paper reviews the key techniques of P index, including the P loss factors which are taken into account in P indices and modifications of calculation of PI value, and then analyzes the using extent and scale.

Key words: agricultural non point source, high risk areas identification, phosphorus index, risk assessment