Abstract HTML Views: 665 PDF Downloads: 257 Total Views/Downloads: 1055
Abstract HTML Views: 433 PDF Downloads: 176 Total Views/Downloads: 717
The unreasonable agricultural management measure is the main cause of the risk of nitrogen and phosphorus
losses. The objective of this paper was to evaluate the impacts of agricultural management practices on the risk of nitrogen
and phosphorus losses at catchment scales based on GIS and integrated index models. The results showed that 93.1%
of the catchment was no risk and low risk area, while 6.9% for medium and high risk of nitrogen and phosphorus losses.
Spatial analysis of risk index indicated that different agricultural management practices lead to number and proportion of
grids are different. At very high risk area, about 599 of grid number is only for the actual management practice, accounting
for 0.22% of the total, while at very low risk area, 165884.00 and 60.51% for river buffer zone respectively. Control
effect of different agricultural management practices for risk of nitrogen and phosphorus losses is better, which very low
and low risk areas of based fertilizer applied deeply and buffer zone construction accounted for 98% and 95.6%, and the
control effect sorted as follows: base fertilizer applied deeply> construction of river buffer zone> reduced nitrogen application>
reduced phosphorus application.