期刊
GEOMICROBIOLOGY JOURNAL
卷 26, 期 7, 页码 484-490出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01490450903061085
关键词
humic acids; lignite; microbial degradation; nitrogen incorporation
资金
- Ministry of Science and Technology of China [2006AA10A213]
- Key Projects in the National Science & Technology Pillar Program [2006BAD07A01]
Previous study showed that nitrogen content in lignite humic acids (HA) increased significantly during lignite biodegradation. In this paper we evaluated the factors responsible for the increased level of N in HA and the formation of new nitrogen compound following microbial degradation. When the ammonium sulfate concentration in lignite medium was 0.5%, the N-content in HA was higher than that in the crude lignite humic acid (cHA); when the ammonium sulfate concentration was epsilon 0.5%, both the biodegraded humic acid (bHA) N-content and the content of bHA in lignite increased significantly, but at 2.0% no increase was observed. This indicated that HA incorporated N existing in the lignite medium, and more HA can incorporate more N with the increase of bHA amount in lignite during microbial degradation. CP/MAS 15N NMR analysis showed that the N incorporated into HA during biotransformation was in the form of free or ionized NH2-groups in amino acids and sugars, as well as NH4+. We propose nitrogen can be incorporated into HA biotically and abiotically. The high N content bHA has a potential application in agriculture since N is essential for plant growth.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据