| 日本北海道农村生态系统中N循环研究 |
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| 作者姓名： | L. LIANG T. NAGUMO R. HATANO |
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| 作者单位： | [1]Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589 （Japan）. [2]Center for Education and Research of Field Sciences, Shizuoka University, Fujieda 426-0001 （Japan） [3]Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-8589 （Japan） |
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| 基金项目： | Project supported by the Science Research Foundation, Japan （No. 11460028）. |
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| 摘 要： | 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 by 70.2%, and 23.72 Mg manure N was recycled to the field; therefore, the N utilization efficiency was raised from 18.1% to 35.1%. If all the manure N in the chicken subsystem was recycled, chemical fertilizer application would be reduced by 8.1% from the present level, and the point sources of N pollution would be reduced by 20.8%.
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| 关 键 词： | 化学肥料 生态系统 生态环境 氮 承载量 |
| 收稿时间： | 2005-11-11 |
| 修稿时间： | 2006-02-18 |
Nitrogen flow in the rural ecosystem of Mikasa City in Hokkaido, Japan |
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| L. LIANG,T. NAGUMO,R. HATANO.Nitrogen flow in the rural ecosystem of Mikasa City in Hokkaido, Japan[J].Pedosphere,2006,16(2):264-272. |
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| Authors: | L LIANG T NAGUMO and R HATANO |
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| Institution: | Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589 (Japan). E-mail: liang@chem.agr.hokudai.ac.jp;Center for Education and Research of Field Sciences, Shizuoka University, Fujieda 426-0001 (Japan);Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589 (Japan). E-mail: liang@chem.agr.hokudai.ac.jp;Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-8589 (Japan) |
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| Abstract: | 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 by 70.2%, and 23.72 Mg manure N was recycled to the field; therefore, the N utilization efficiency was raised from 18.1% to 35.1%. If all the manure N in the chicken subsystem was recycled, chemical fertilizer application would be reduced by 8.1% from the present level, and the point sources of N pollution would be reduced by 20.8%. |
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| Keywords: | chemical fertilizers ecosystem environmental nitrogen load nitrogen flow nitrogen budget |
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