Runoff nitrogen (N) losses and related metabolism enzyme activities in paddy field under different nitrogen fertilizer levels

文献类型： 外文期刊

第一作者： Wang, Junli

作者： Wang, Junli;Fu, Zishi;Chen, Guifa;Zou, Guoyan;Song, Xiangfu;Liu, Fuxing;Wang, Junli;Fu, Zishi;Chen, Guifa;Zou, Guoyan;Song, Xiangfu;Liu, Fuxing;Zou, Guoyan

作者机构：

关键词： Rice; N fertilizer level; Surface runoff; N metabolism; Enzyme activity

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2018 年 25 卷 27 期

页码：

收录情况： SCI

摘要： Nitrogen (N), one of the most important nutrients for plants, also can be a pollutant in water environments. N metabolism is sensitive to N fertilization application and related to rice growth. Different levels of N fertilization treatment (N0, control without N fertilizer application; N100, chemical fertilizer of 100 kg N ha(-1); N200, chemical fertilizer of 200 kg N ha(-1); N300, chemical fertilizer of 300 kg N ha(-1)) were tested to investigate N loss due to surface runoff and to explore the possible involvement of rice N metabolism responses to different N levels. The results indicated that N loss through runoff and rice yield was simultaneously increased in response to increasing N fertilizer levels. About 30% of total nitrogen (TN) was lost in the form of ammonium (NH4 (+)) in a rice growing season, while only 3% was lost in the form of nitrate (NO3 (-)). Higher N application increased carbon (C) and N content and increased nitrate reductase (NR) and glutamine synthetase (GS) activities in rice leaves, while it decreased glutamate synthase (GOGAT) and glutamate dehydrogenase (GDH) activities. These results suggest that N caused the accumulation of assimilation products in flag leaves of rice and stimulated N metabolic processes, while some protective substances were also stimulated to resist low N stress. This study provides a theoretical basis for improving N fertilizer management to reduce N loss and increase rice yield.

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