Characteristics of Non-Point Source N Export via Surface Runoff from Sloping Croplands in Northeast China

Abstract:

A field experiment was conducted to study the characteristics of non-point source nitrogen (N) in the surface runoff from sloping croplands and the influences of rainfall and cropland slope gradient. The results showed that dissolved total N (DTN) was the major form of N in the runoff, and the proportion occupied by dissolved inorganic nitrogen (DIN) ranged from 45% to 85%. The level of NH₄⁺-N was generally higher than the level of NO₃^--N, and averaged at 2.50 mg·L^-1 and 1.07 mg·L^-1 respectively. DIN was positively correlated with DTN (R²=0.962). Dissolved organic N (DON) presented a moderate seasonal change and averaged at 1.40 mg·L^-1. Rainfall amount and rainfall intensity significantly affected the components of DTN in the runoff. With the increase of rainfall amount and rainfall intensity, the concentrations of DTN, NH₄⁺-N and NO₃^--N presented a decreased trend, while the concentration of DON showed an increased trend. N loss went up with an increase in the gradient of sloping cropland, and was less when the duration was longer from the time of N fertilization.fertilization.

• Periodical: Advanced Materials Research (Volumes 347-353)
• Pages: 2302-2307
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.347-353.2302
• Online since: October 2011
• Authors: Hong Xiang Wang, Yi Shi, Jian Ma, Cai Yan Lu, Xin Chen
• Keywords: Dissolved N, Export Characteristics, N Pollution, Sloping Cropland

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