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Nutrient Cycling in Agroecosystems

, Volume 57, Issue 1, pp 67–73 | Cite as

An assessment of N loss from agricultural fields to the environment in China

  • G.X. XingEmail author
  • Z.L. Zhu
Article

Abstract

Using the 1997 IPCC Guidelines for National Greenhouse Gas Inventory Methodology, and statistical data from the China Agricultural Yearbook, we estimated that the direct N2O emission from agricultural fields in China in 1990 was 0.282 Tg N. Based on micro-meteorological field measurement of NH3 volatilization from agricultural fields in different regions and under different cropping systems, the total NH3 volatilization from agricultural fields in China in 1990 was calculated to be 1.80 Tg N, which accounted for 11% of the applied synthetic fertilizer N. Ammonia volatilization from agricultural soil was related to the cropping system and the form of N fertilizer. Ammonia volatilization from paddy fields was higher than that from uplands, and NH4HCO3 had a higher potential of NH3 volatilization than urea. N loss through leaching from uplands in north China accounted for 0.5–4.2% of the applied synthetic fertilizer N. In south China, the leaching of applied N and soil N from paddy fields ranged from 6.75 to 27.0 kg N ha-1 yr-1, while N runoff was between 2.45 and 19.0 kg N ha-1 yr-1.

N leaching N2NH3 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  1. 1.Institute of Soil ScienceAcademia SinicaNanjingP.R. China
  2. 2.Institute of Soil ScienceAcademia SinicaNanjingP.R. China

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