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Journal of Mountain Science

, Volume 5, Issue 2, pp 130–139 | Cite as

Evaluation of nitrogen cycling associated with agricultural production and environmental load in a mountain region, in Hokkaido, Japan

  • Lei LiangEmail author
  • Datian Jin
  • Ning Hu
Article
  • 62 Downloads

Abstract

This study examined the nitrogen cycling associated with agricultural production and environmental load in central Hokkaido. The nitrogen (N) budget analysis model offers a new set of tools for evaluating N cycling in agro-ecosystems. The cycling index (CI) is a useful tool for estimating optimal N flows in farmlands. The fertilization index (FI) is a useful indicator for characterizing the N flows related to farms. Using these parameters, we analyzed all farm systems to estimate the optimal N cycling for minimizing N pollution in groundwater and maximizing agricultural production in mountain regions of Japan. The results showed that the critical N application rate (chemical fertilizer + manure) was 143.3 kg N ha−1 y−1. The critical inter-system input (chemical fertilizer N, imported food and feed N, and natural supplied N) was 169.2 kg N ha−1y−1.

Keywords

Cycling index mountain agro-ecosystem N cycling N load N management Hokkaido Japan 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH 2008

Authors and Affiliations

  1. 1.Faculty of EnvironmentLiaoning UniversityShenyangChina

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