Nitrogen Flow in the Rural Ecosystem of Mikasa City in Hokkaido, Japan

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Nitrogen Flow in the Rural Ecosystem of Mikasa City in Hokkaido, Japan

机译：日本北海道三ika市农村生态系统中的氮流

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This study of Mikasa City in 2001, which analyzed N flow between N production and N load in seven agricultural and settlement subsystems, i.e., paddy, onion, wheat, vegetable, dairy, chicken, and citizen subsystems, aimed to compare N flow in each subsystem, to determine the main sources of the N load, and to evaluate the influence of agricultural production and food consumption on N cycling in a rural area. The results showed that in Mikasa city, 38.5% of the N load came from point sources and the remainder from non-point sources with intensive vegetable farming imparting a serious N load. Because of the internal N cycling in the dairy subsystem, chemical fertilizer application was reduced by70.2%, and 23.72 Mg manure N was recycled to the field; therefore, the N utilization efficiency was raised from 18.1% to35.1%. If all the manure N in the chicken subsystem was recycled, chemical fertilizer application would be reduced by8.1% from the present level, and the point sources of N pollution would be reduced by 20.8%.

机译：2001年三in市的这项研究分析了七个农业和定居子系统（即水稻，洋葱，小麦，蔬菜，乳制品，鸡肉和市民子系统）中氮素生产与氮素负荷之间的氮素流量，旨在比较每个子系统中的氮素流量。子系统，以确定氮负荷的主要来源，并评估农业生产和粮食消费对农村地区氮循环的影响。结果表明，在三ika市，氮负荷的38.5％来自点源，其余来自非点源，而集约化蔬菜种植会给氮带来严重的负荷。由于乳品子系统内部的氮循环，化学肥料的施用量减少了70.2％，并将23.72 Mg的肥料N再循环到田间。因此，氮的利用效率从18.1％提高到35.1％。如果将鸡子系统中的所有肥料中的N进行回收利用，则化学肥料的施用量将比目前水平减少8.1％，而N污染的点源将减少20.8％。

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《土壤圈（英文版）》 |2006年第2期|264-272|共9页
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作者单位

Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589 Japan;

Center for Education and Research of Field Sciences, Shizuoka University, Fujieda 426-0001 Japan;

Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589 Japan;

Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-8589 Japan;

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
chemical fertilizers; ecosystem; environmental nitrogen load; nitrogen flow; nitrogen budget;

机译：化肥;生态系统;环境氮负荷;氮流量;氮预算;

Nitrogen Flow in the Rural Ecosystem of Mikasa City in Hokkaido, Japan

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