Journal
PEDOSPHERE
Volume 17, Issue 2, Pages 200-208Publisher
SCIENCE PRESS
DOI: 10.1016/S1002-0160(07)60026-5
Keywords
atmospheric dry and wet N deposition; N-15-labeled fertilizer; N pollution sources in surface waters; N runoff from the farmland; Taihu Lake region
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The nitrogen (N) pollution status of the 12 most important rivers in Changshu, Taihu Lake region was investigated. Water samples were collected from depths of 0.5-1.0 m with the aid of the global positioning system (CPS). The seasonal variations in the concentrations of different N components in the rivers were measured. Using tension-free monolith lysimeters and N-15-labeled fertilizer, field experiments were carried out in this region to determine variations of N-15 abundance of NO3- in the leachate during the rice and wheat growing seasons, respectively. Results showed that the main source of N pollution of surface waters in the Taihu Lake region was not the N fertilizer applied in the farmland but the urban domestic sewage and rural human and animal excreta directly discharged into the water bodies without treatment. Atmospheric dry and wet N deposition was another evident source of N pollutant of the surface waters. In conclusion, it would not be correct to attribute the N applied to farmlands as the source of N pollution of the surface waters in this region.
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