| 淹水稻田氮的损失 |
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| 作者姓名： | GAO Xiao-Jiang HU Xue-Feng WANG Shao-Ping HE Bao-Gen XU Shi-Yuan |
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| 作者单位： | Gao Xiaojiang(Department of Environmental Science and Engineering, Fudan University, Shanghai 200433 China);Hu Xuefeng,WANG SHAOPING,HE BAOGEN,XU SHIYUAN(Department of geography, East China Normal University, Shanghai 200062 China) |
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| 摘 要： | A field microplot experiment was conducted during the tillering stage of paddy rice to investigate nitrogen(N) Iosses from flooded rice fields following fertilizer application. After application of ammonium bicarbonate, most of nitrogen in the flood water was present as NH4-N and its concentration varied widely with time. Concentrations of both NO3-N and NO2-N in the floodwater were low due to the weakened nitrification. Under flooded anaerobic reducing conditions, soil solution concentrations of NO3-N and NH4-N were nothigh, ranging from 0.6 mg L-1 to 4.8 mg L-1, and decreased with soil depth. However, the ground water wasstill contaminated with NO3-N and NH4-N. Rainfall simulation tests showed that the N losses via runoff inrice fields were closely related to the time intervals between fertilizer applications and rainfall events. Whena large rain fell for a short period after fertilizer application, the N losses via runoff could be large, which could have a considerable effect on surface water quality. Both irrigation and N fertilizer application must be controlled and managed with great care to minimize N losses via runoff from agricultural land.
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| 关 键 词： | flooded rice fields fertilizer-N N losses runoff water quality |
Nitrogen losses from flooded rice field |
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| GAO Xiao-Jiang,HU Xue-Feng,WANG Shao-Ping,HE Bao-Gen,XU Shi-Yuan.Nitrogen losses from flooded rice field[J].Pedosphere,2002,12(2):151-156. |
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| Authors: | GAO Xiao-Jiang HU Xue-Feng WANG Shao-Ping HE Bao-Gen and XU Shi-Yuan |
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| Institution: | Department of Environmental Science and Engineering, Fudan University, Shanghai 200433 (China);Department of geography, East China Normal University, Shanghai 200062 (China);Department of geography, East China Normal University, Shanghai 200062 (China);Department of geography, East China Normal University, Shanghai 200062 (China);Department of geography, East China Normal University, Shanghai 200062 (China) |
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| Abstract: | A field microplot experiment was conducted during the tillering stage of paddy rice to investigate nitrogen (N) losses from flooded rice fields following fertilizer application. After application of ammonium bicarbonate,most of nitrogen in the floodwater was present as NHq-N and its concentration varied widely with time.Concentrations of both NO3-N and NO2-N in the floodwater were low due to the weakened nitrification.Under flooded anaerobic reducing conditions, soil solution concentrations of NO3-N and NH4-N were not high, ranging from 0.6 mg L- 1 to 4.8 mg L-1, and decreased with soil depth. However, the groundwater was still contaminated with NO3-N and NH4-N. Rainfall simulation tests showed that the N losses via runoff in rice fields were closely related to the time intervals between fertilizer applications and rainfall events. When a large rain fell for a short period after fertilizer application, the N losses via runoff could be large, which could have a considerable effect on surface water quality. Both irrigation and N fertilizer application must be controlled and managed with great care to minimize N losses via runoff from agricultural land. |
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| Keywords: | flooded rice fields fertilizer-N N losses runoff water quality |
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