Role of Organic Nitrogen and Carbon in Canal Sediments on Drainage Water in Paddy Fields
Role of Organic Nitrogen and Carbon in Canal Sediments on Drainage Water in Paddy Fields
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DOI：
10.2965/jwet.15-020
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发表时间：
2016
影响因子：
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通讯作者：
T. Hama;Tomohisa Nagai;Chinami Jikumaru;Y. Kawagoshi;Daichi Iwasaki
中科院分区：
文献类型：
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作者：
T. Hama;Tomohisa Nagai;Chinami Jikumaru;Y. Kawagoshi;Daichi Iwasaki
在稻田中，排水渠沉积物可以作为一个污染源，如果没有适当的管理。本研究的目的是评估沉积物对稻田排水中氮（N）和有机碳（C）浓度的作用。排水渠沉积物取样在三个稻田区周围的琵琶湖和培养28天。实验结果表明，河渠沉积物具有足够的氮、碳源潜力。沉积物中总氮和总碳含量分别为1.95 - 3.38和21.1 - 32.8 mg/kg。沉积物中氮主要以有机态存在。在培养实验过程中，大量的NH 4-N从沉积物中释放出来。培养沉积物中类胡敏素荧光峰与上覆水中溶解性有机氮和碳有较强的相关性。由此可见，沉积物中大量的有机氮可以通过分解释放成为上覆排水长期的NH 4-N来源。
In paddy fields, the drainage canal sediments can act as a pollutant source without proper management. The objective of this study is to evaluate the role of the sediments on the nitrogen (N) and organic carbon (C) concentrations in drainage water in paddy fields. Drainage canal sediments were sampled at three paddy-field districts around Lake Biwa and incubated for 28 days. Results of the experiments confirmed that the drainage canal sediments had enough potential as N and C sources. The sedimentary total N and C concentrations were 1.95 – 3.38 and 21.1 – 32.8 mg/kg, respectively. Nitrogen in the sediments existed mainly in the organic state. During the incubation experiment, large amounts of NH4-N were released from the sediments. Fluorescence peaks of humic-like substance had strong correlation with dissolved organic N and C in the overlying water on the incubated sediments. It can be concluded that large amounts of organic N in the sediments can be a long-term NH4-N source for the overlying drainage water through decomposition and release.