Nitrite transformations in an N-saturated forest soil

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• 作者：Kazuo Isobe^a ; ^{akisobe@mail.ecc.u-tokyo.ac.jp} ; Keisuke Koba^b ; Yuichi Suwa^c ; Junko Ikutani^b ; Megumi Kuroiwa^b ; Yunting Fang^b ; ^d ; Muneoki Yoh^b ; Jiangming Mo^d ; Shigeto Otsuka^a ; Keishi Senoo^a
• 关键词：Nitrite dynamics ; Acidic forest soil ; Subtropical forest ; Nitrogen saturation ; Dissolved organic nitrogen ; 15N
• 刊名：Soil Biology & Biochemistry
• 出版年：2012
• 期刊代码：96_00380717
• 类别：abs
• 出版时间：September, 2012
• 卷：52
• 期：Complete
• 页码：61-63
• 文件大小：217 K

摘要

Nitrite dynamics could be highly associated with forest N cycles. However, they have often been overlooked mainly because of the experimental difficulties that occur owing to chemical reactive nature of NO₂^{鈭?/sup>. We investigated NO₂鈭?/sup> dynamics in an N-saturated forest soil with a recently developed method using 15N. Soils were aerobically incubated for 145聽h after 15NO₂鈭?/sup> addition, and changes in 14N and 15N concentrations of NO₂鈭?/sup>, NO₃鈭?/sup>, NH₄+, and dissolved organic N (DON) were monitored. Simultaneous production and consumption of NO₂鈭?/sup> were observed. The turnover rate of NO₂鈭?/sup> was even faster than that of NH₄+ and NO₃鈭?/sup> calculated in other studies. Of the added 15NO₂鈭?/sup>, 28.5%was oxidized to NO₃鈭?/sup> and 17.8%was incorporated into the DON pool within 4聽h. The remainder might be emitted as gas or fixed by insoluble soil organic matter. Our results suggested that rapid NO₂鈭?/sup> turnover could be a major driving force for N transformations in forest soil.}