Evaluation of nitrogen cycling associated with agricultural production and environmental load in a mountain region,in Hokkaido,Japan |
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Authors: | Lei Liang Datian Jin Ning Hu |
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Affiliation: | Faculty of Environment, Liaoning University, Shenyang 110036, China |
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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 169.9 kg N ha-1y-1. |
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Keywords: | Cycling index mountain agro-ecosystem N cycling N load N management Hokkaldo Japan |
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