Amino acids in grassland soils: Climatic effects on concentrations and chirality

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	Amino acids in grassland soils: Climatic effects on concentrations and chirality
	Amelung, W; Zhang, X; Flach, KW; Amelung, W, Univ Bonn, Inst Soil Sci, Nussallee 13, D-53115 Bonn, Germany
刊名	GEODERMA
	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
英文摘要	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
语种	英语
WOS记录号	WOS:000234936200002
公开日期	2011-09-23
内容类型	期刊论文
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
通讯作者	Amelung, W, Univ Bonn, Inst Soil Sci, Nussallee 13, D-53115 Bonn, Germany
推荐引用方式 GB/T 7714	Amelung, W,Zhang, X,Flach, KW,et al. 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,&Amelung, W, Univ Bonn, Inst Soil Sci, Nussallee 13, D-53115 Bonn, Germany.(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.