%0 Journal Article
%T The fate of fertilizer-derived nitrogen in a rice field in the Qingtongxia irrigation area<br>青铜峡灌区水稻田化肥氮去向研究
%A ZHANG Qingwen
%A ZHANG Hui
%A YI Jun
%A LUO Liangguo
%A ZHANG Aiping
%A WANG Fang
%A LIU Ruliang
%A YANG Zhengli
%A <br>张晴雯
%A 张惠
%A 易军
%A 罗良国
%A 张爱平
%A 王芳
%A 刘洳亮
%A 杨正礼
%J 环境科学学报
%D 2010
%I 
%X Nitrogen cycling in natural environments has been seriously disturbed due to fertilizer overuse or misuse. Some nitrogen oxides in the imbalanced nitrogen cycle are main contributors for major environmental problems like water eutrophication. Nitrate leaching from agricultural lands during the growing season and its threat to water quality is an important global environmental issues. Field experiments were carried out at a rice field in the Ningxia Hui Autonomous Region in northwestern China to provide information on the fate of (fertilizer-derived nitrogen) FDN in the Qingtongxia irrigation area of the upper Yellow River basin. We used the stable isotope 15N to trace the fate of the applied nitrogen fertilizer. The fertilization levels in this study were 0, 240 and 300 kg·hm-2. We estimated the recovery of FDN in root, stover and grain of rice and profile distribution of fertilizer nitrogen residue in soil. The results showed that the uptake of FDN in grain was increased by higher N application rate. At a high level of fertilization (300 kg·hm-2), nitrogen uptake from fertilizer by the rice plant at harvest is 45.93%, percentage of N in the plant tissue derived from the soil is 52.63%, recovery by rice is 27.90%, soil residual N is 23.31%, the combined recovery of rice and soil is 51.21%, and the loss rate of nitrogen fertilizer is 48.79%. Based on statistical data, 500 million kg of nitrogen fertilizer is used in the Ningxia Hui Autonomous Region each year. Its loss from rice fields in one growing season is 27.81 million kg. To produce 1000 kg rice, the nitrogen loss is 20.17 kg. Soil residues of nitrogen fertilizer were also measured even to a soil depth of 60~90 cm, indicating that nitrogen fertilizer leaching could be a pollution source for underground water.
%K irrigation area
%K rice field
%K fertilizer-derived nitrogen
%K 15N<br>灌区
%K 水稻田
%K 化肥氮去向
%K 15N同位素示踪技术
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=03A55E61A8750ACAC6AF81EF9E2AC838&aid=D96C1B6F7DBE08618595D659801E96CA&yid=140ECF96957D60B2&vid=340AC2BF8E7AB4FD&iid=5D311CA918CA9A03&sid=F69F61A42EF5D746&eid=7128E4A5513059D9&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=2&reference_num=18