Spatial and Temporal Changes of Nitrogen Balance and its Environmental Impact of Eastern Liao River29

Abstract:

The nitrogen (N) balance is studied the spatial and temporal changes of N inputs and outputs in eastern Liao River watershed. Using the social economic and the related hydrological data from 2001 to 2010, the N inputs are quantified from the aspects of fertilizer use, human and animal excreta, atmospheric deposition and biological nitrogen fixation, and the N outputs from the aspects of denitrification, ammonium volatilization, crop harvest. Results indicates that the mean annual N inputs vary from 185.01 ×10⁶kga^-1 to 200.68×10⁶kga^-1, with a mean value of 192.02×10⁶ kga^-1. Diffuse sources shows that chemical N fertilizer constitutes the largest source of total N inputs, accounting for about 50.23%. The mean annual N outputs range from 132.10×10⁶kga^-1 to 170.38×10⁶kga^-1, and agricultural N output is the maximum output. The large gap between N inputs and outputs results in the high N surplus of 132.10×10⁶ kga^-1~170.38×10⁶kga^-1, which results in the transfer of N from the terrestrial system to the aquatic system and increasing the risk of water eutrophication.

• Periodical: Advanced Materials Research (Volumes 864-867)
• Pages: 22-25
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.864-867.22
• Online since: December 2013
• Authors: Juan Zhao, Jian Min Bian*, Zhen Zhen Zhang
• Keywords: Eastern Liao River, Nitrogen Balance, Terrestrial Ecosystem, Water Environment

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