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| 尿素向氨基糖的转化以及对土壤氨基糖库动态的影响 | |
| 引用本文： | 李晓波,张威,田秋香,吕慧捷,丁雪丽,何红波,张旭东.尿素向氨基糖的转化以及对土壤氨基糖库动态的影响[J].土壤学报,2011,48(6):1189-1195. |
| 作者姓名： | 李晓波 张威 田秋香 吕慧捷 丁雪丽 何红波 张旭东 |
| 作者单位： | 1. 森林与土壤生态国家重点实验室(中国科学院沈阳应用生态研究所)沈阳 110164;土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008 2. 森林与土壤生态国家重点实验室(中国科学院沈阳应用生态研究所),沈阳,110164 3. 森林与土壤生态国家重点实验室(中国科学院沈阳应用生态研究所),沈阳 110164;辽宁沈阳农田生态系统国家野外科学观测研究站,沈阳110016 |
| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
| 摘 要： | 采用13CO(NH2)2为底物进行黑土培养实验,利用气相色谱/质谱技术测定土壤中三种氨基糖含量以及同位素富集比例,根据其微生物标识物作用探讨土壤中不同微生物群落对于尿素碳的同化利用特征及黑土氨基糖库对于尿素添加的响应。研究结果表明,尿素碳可以被土壤微生物同化利用,但是可利用性显著低于葡萄糖。氨基葡萄糖中13C富集比例显著高于胞壁酸,表明真菌对尿素碳的同化能力高于细菌。尿素添加使土壤有机碳含量有所下降,同时土壤氨基糖总量及其与有机碳的相对比例也显著降低,说明在碳源严重受限条件下,氨基糖可被优先分解利用以补充碳源供给。胞壁酸含量虽低,但其调节并平衡碳氮元素供给与需求的能力较强;氨基葡萄糖稳定性高于胞壁酸,但在碳源缺乏时也可部分分解。土壤氨基糖的动态与土壤碳氮的可利用性及其耦合作用密切相关,在平衡土壤碳氮需求方面具有一定的调节作用。 |
| 关 键 词： | 尿素碳 氨基糖 转化 微生物利用 黑土 |
| 收稿时间： | 1/18/2011 6:33:27 PM |
| 修稿时间： | 7/6/2011 9:22:20 PM |
Transformation of urea to amino sugar and its effect on dynamics of soil amino sugar pool |
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| Li Xiaobo.Transformation of urea to amino sugar and its effect on dynamics of soil amino sugar pool[J].Acta Pedologica Sinica,2011,48(6):1189-1195. | |
| Authors: | Li Xiaobo |
| Affiliation: | Institute of Soil Science, Chinese Academy of Sciences,Institute of Applied Ecology, Chinese Academy of Sciences |
| Abstract: | Mollisol samples were incubated indoors with 13CO(NH2)2 as substrate to investigate transformation of urea-carbon into soil amino sugar and its effect on dynamics of amino sugar pool. Contents of the three types of amino sugars (glucosamine, galactosamine and muramic acid) and their enrichments of 13C were measured with gas chromatography/mass spectrometry. On such a basis, specific utilization of urea-carbon by different microbial communities was evaluated. Results show that urea-carbon might be assimilated by soil microorganisms, but was significantly lower in availability than glucose-carbon. A higher amount of 13C was found in glucosamine than in muramic acid, suggesting that fungi are more capable of assimilating urea-carbon than bacteria. Application of urea decreased soil organic carbon content to some extent and at the same time significantly lowered the total amino sugar and its relative proportion in soil organic carbon, indicating that in severe shortage of carbon sources, amino sugars would be the priority carbon source to be decomposed to make up the carbon supply. Although muramic acid was very low in concentration, it was highly capable of regulating and balancing carbon budget. Glucosamine was more stable than muramic acid, but decomposition of some of it was found in shortage of other carbon sources. As a whole, the dynamics of amino sugars is closely associated with the availability of soil carbon sources and their coupling effect, thus playing an important role in regulating supply and requirement of carbon and nitrogen in soil. |
| Keywords: | Urea-carbon Amino sugars Transformation Microorganism utilization Mollisol |
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