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[1]LI Ying-jun,WANG Ke-qin,SONG Wei-feng,et al.Nitrogen Loss in the Farmland Surface Runoff under the Natural Rainfall Conditions[J].Research of Soil and Water Conservation,2010,17(04):19-23.

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Nitrogen Loss in the Farmland Surface Runoff under the Natural Rainfall Conditions

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 17 Number of periods: 2010 04 Page number: 19-23 Column: Public date: 2010-08-20

Title:: Nitrogen Loss in the Farmland Surface Runoff under the Natural Rainfall Conditions

Author(s):: LI Ying-jun¹, WANG Ke-qin¹, SONG Wei-feng¹, GUO Sheng-hao¹, LI Tai-xing², LI Yun-jiao³; 1. Department of Environmental Sciences&Engineering, Southwest Forestry College, Kunming 650224, China;
2. Yuxi Municipal Hydrological Burea, Yuxi, yunnan 653100;
3. Chengjiang County Hydrological Burea, Chengjiang, yunnan 653102, China

Keywords:: natural rainfall; surface runoff; nitrogen loss

CLC:: S157

DOI:: -

Abstract:: In the present study,we studied the characteristics of nitrogen loss in the slope farmland surface runoff under the natural rainfall conditions through the standard runoff plots and micro-plot methods in the Jianshan River Basin in Chengjiang county.The results showed that the quantity and intensity of rainfall were the main factors causing surface runoff.Therefore,some precaution measures should be done in rainy seasons.The maximum nitrogen concentration in surface runoff reached to 30.72mg/L.Nitrate-nitrogen occupied l4%～28% of total nitrogen loss,whereas ammonia-nitrogen accounts only 1%～8% of total nitrogen loss.In conclusion,the accumulative total nitrogen loss in surface runoff was 0.45～1.18kg/hm²,and the loss coefficient was only 0.1%～0.12%.

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