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《Journal of Fuzhou University(Natural Science Edition)》 2006-04
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Assessment of nitrogen leaching amount on various land use in field

ZHANG Yu-zhen(Environment Science Reasearch Insititute of Fujian,Key Laboratory of Environmental Engineering of Fujian Province,Fuzhou,Fujian 350013,China)  
Assessment of soil nitrogen leaching was conducted under five kinds of land uses,such asbananas ,vegetables,sugarcane,paddy and uncultivated land,at Wuchuan small watershed of Najing county in Zhangzhou city,Fujian province.Subsurface water samples of various land use plots were collected monthly and analyzed for both nitrate nitrogen and ammonium nitrogen concentration.Percolation was calculated based on water balance method.Evapotranspiration(ET_S) of related crops within watershed were estimated by Penman-Monteith equation.Surface runoff equals to the ratio of stormflow discharge to precipitation which monitored in outlet of watershed.Change in subsurface amount was calculated based on field soil content increasing.Nitrogen leaching amount of various land use equals to nitrogen concentration of various land use multiplying by leaching amount.Assessment results showed that nitrogen leaching amount varied from 11.8 to 54?kg/hm~2,about 3.1%~7.7% of fertilizer input.Banana and paddy plots had maximum nitrogen leaching loss.
【Fund】: 福建省青年科技人才创新基金资助项目(2005J065)
【CateGory Index】: X592
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