Amino acids in grassland soils: Climatic effects on concentrations and chirality
文献类型：期刊论文
| 作者 | Amelung, W ; Zhang, X ; Flach, KW |
| 刊名 | GEODERMA
 |
| 出版日期 | 2006 |
| 卷号 | 130期号:3-4页码:207-217 |
| 关键词 | climate change soil N cycle grassland soils microbial residues racemization amino acid enantiomers |
| ISSN号 | 0016-7061 |
| 通讯作者 | Amelung, W, Univ Bonn, Inst Soil Sci, Nussallee 13, D-53115 Bonn, Germany |
| 中文摘要 | The response of soil organic nitrogen (SON) dynamics to climate may partly be deduced from changes in the concentration and origin of the major N constituents in soil, such as amino acids. In this study, we determined the enantiomers of bound amino acids in 18 native grassland soils (0-10 cm) that were sampled along a transect from central Saskatchewan, Canada, to Southern Texas, USA. Mean annual temperature (MAT) ranged from 0.9 to 23.4 degrees C and mean annual precipitation (MAP) from 300 to 1308 MM. D-alanine and D-glutamic acid served as markers for the bacterial origin of SON. The D-content of lysine, phenylalanine, and aspartic acid indicated an ageing of the respective SON forms. Deuterium labeling was applied to account for hydrolysis-induced racemization reactions. We found that the concentration of the bacterial biomarkers was weakly but significantly parabolically related to MAT, as previously reported for microbial-derived amino sugars. The age markers D-lysine, D-phenylalanine, and D-aspartic acid comprised 2-15% of the respective L-form. The presence of these compounds demonstrated that the structures that contained these D-enantiomers had survived microbial attack, i.e., these hydrolyzable SON forms were conserved in soil despite a living environment. First estimates indicate that the mean residence time of the lysine-containing organic matter forms extend beyond a century. Within this time-scale we did not find that climate significantly affects the degree of ageing of SON constituents in the studied topsoils. (C) 2005 Elsevier B.V. All rights reserved. |
| 学科主题 | Soil Science |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000234936200002 |
| 公开日期 | 2011-09-23 |
| 源URL | [http://210.72.129.5/handle/321005/55017]  |
| 专题 | 沈阳应用生态研究所_沈阳应用生态研究所_期刊论文 |
| 推荐引用方式 GB/T 7714 | Amelung, W,Zhang, X,Flach, KW. Amino acids in grassland soils: Climatic effects on concentrations and chirality[J]. GEODERMA,2006,130(3-4):207-217. |
| APA | Amelung, W,Zhang, X,&Flach, KW.(2006).Amino acids in grassland soils: Climatic effects on concentrations and chirality.GEODERMA,130(3-4),207-217. |
| MLA | Amelung, W,et al."Amino acids in grassland soils: Climatic effects on concentrations and chirality".GEODERMA 130.3-4(2006):207-217. |
入库方式： OAI收割
来源：沈阳应用生态研究所
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