Evaluation of Nitrogen Cycling Associated with Agricultural Production and Environmental Load in a Mountain Region, in Hokkaido, Japan Evaluation of Nitrogen Cycling Associated with Agricultural Production and Environmental Load in a Mountain Region, in Hokkaido, Japan

最小化 最大化

Vol5 No.2: 130-139

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

AuthorLIANG Lei, JIN Datian, HU Ning        

AddressesFaculty of Environment, Liaoning University, Shenyang, 110036, China

Corresponding authorsyliangjp@hotmail.com

CitationLIANG Lei, JIN Datian, HU Ning (2008) Evaluation of nitrogen cycling associated with agricultural production and environmental load in a mountain region, in Hokkaido, Japan. JOURNAL OF MOUNTAIN SCIENCE 5(2):130-139. DOI: 10.1007/s11629-008-0027-x

DOI10.1007/s11629-008-0027-x

AbstractThis 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-1 y-1.

Keywordscycling index; mountain agro-ecosystem; N cycling; N load; N management; Hokkaido; Japan