Wang,S., Jin,X., Jiao,L. and Wu,F.(2008): Nitrogen fractions and release in the sediments from the shallow lakes in the middle and lower reaches of the Yangtze River area, China. Water Air Soil Pollut, 187, 5-14.

『中国の長江の中流および下流域にある浅い湖からの堆積物における窒素画分と放出量』

『Abstract
　Different nitrogen (N) fractions from 14 sediments from the shallow lakes in the middle and lower reaches of Yangtze River area before and after N release experiments were investigated, and the content of different N fractions, and contribution of different N fractions to the N released from sediments were also studied. Ion-exchangeable form (IEF-N), carbonate form (CF-N), iron-manganese oxide form (IMOF-N) and organic matter-sulfide form (OSF-N) accounted for 2.72〜17.67％, 0.47〜4.43％, 1.18〜3.49％ and 31.05 to 71.61％ to total N, respectively. The N released was higher than 50％ from IEF-N, approximately 35％ from OSF-N, 6 and 8％ from CF-N and IMOF-N on the average. Approximately 27.32〜70.02％ of IEF-N, 10.37〜32.11％ of CF-N, 11.37〜33.43％ IMOF-N and 2.02〜8.19％ OSF-N were released. For the sediments that were slightly polluted, IEF-N was the main N fraction that may be released and its contribution to total N released was more than 63.07％, for the sediments that TN was higher than 3,540.27 mg kg-1, OSF-N would become the main N fraction that can be released and its contribution to total N released was more than 45％.

Keywords: Nitrogen fractions; Nitrogen release; Middle and lower reaches of the Yangtze River area; Lake sediment』

『要旨
　窒素放出実験の前後に長江の中流と下流における浅い湖から採取された14の堆積物から得られた異なる窒素画分が調べられ、堆積物から放出された窒素に対する異なる窒素画分の寄与についても研究された。イオン交換可能な形の窒素（IEF-N）と炭酸塩形（CF-N）と鉄−マンガン酸化物形（IMOF-N）と有機物−硫化物形（OSF-N）は、それぞれ合計の窒素の2.72〜17.67％と0.47〜4.43％と1.18〜3.49％と31.05 to 71.61％であった。放出された窒素は平均してIEF-Nからは50％以上であり、OSF-Nからはほぼ35％で、CF-NとIMOF-Nからは6％と8％であった。ほぼ、IEF-Nの27.32〜70.02％、CF-Nの10.37〜32.11％、IMOF-Nの11.37〜33.43％、OSF-Nの2.02〜8.19％が放出された。わずかに汚染された堆積物については、IEF-Nが放出されやすくて全窒素放出分の63.07％以上に寄与する主要な窒素画分であり、全窒素が3,540.27 mg/kg以上ある堆積物では、OSF-Nが放出されて全窒素放出分の45％以上に寄与する主要な窒素画分になるであろう。』

1. Introduction
2. Materials and methods
　2.1. Study area, sediment sampling and general characteristics
　2.2. N fractions
　2.3. N release experiments
3.Results and discussion
　3.1. N fractions in sediments
　3.2. The relationship between different N fractions and sediment properties
4. Conclusions
Acknowledgement
References

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