Plant-N incorporation into microbial amino sugars as affected by inorganic N addition: A microcosm study of (15)N-labeled maize residue decomposition

doi:10.1016/j.soilbio.2011.06.012

	Plant-N incorporation into microbial amino sugars as affected by inorganic N addition: A microcosm study of (15)N-labeled maize residue decomposition
	Ding, Xueli 1,3; He, Hongbo 1; Zhang, Bin 1,2; Zhang, Xudong 1
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2011-09-01
卷号	43 期号:9 页码:1968-1974
关键词	Mineral Nitrogen Plant Residue Isotope Microbial Biomarker Amino Sugar Transformation
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2011.06.012
英文摘要	Carbon (C) and/or nitrogen (N) in plant residues can be assimilated into microbial biomass during the plant residue decomposition before incorporation into SOM in the form of microbial residues. Yet, microbial transformation of plant residue-N into microbial residues and the effects of inorganic N inputs on this process have not been well documented. Here, we undertook a 38-week incubation with a silt loam soil amended with a (15)N-labeled maize (Zea mays L) residue to determine how the transformation of maize residue-N into soil amino sugars was affected by rates of inorganic N addition. The newly metabolized amino sugars derived from maize residue-N were differentiated and quantified by using an isotope-based gas chromatography-mass spectrometry technique. We found that greater amounts of maize residue-N were transformed into amino sugars with lower inorganic N addition at the early stages of the plant residue degradation. However, the trend was reversed during later stages of decay as greater percentage of maize residue-N (8.6-9.4%) were enriched in amino sugars in the N(med) and N(high) soils, as compared with N(0) and N(low) (7.5-8.2%). This indicated that higher availability of inorganic N could delay the transformation process of plant-N into microbial residues during the mineralization of plant residues. The dynamic transformations of the plant residue-N into individual amino sugars were compound-specific, with very fast incorporation into bacterial MurA(M-new) found during the initial weeks, while the dynamics of maize residue-derived GluN exhibited a delayed response to assimilate plant-N into fungal products. The findings indicated differential contributions of maize residue decomposing microorganisms over time. Moreover, we found no preferential utilization of inorganic N over plant residue-N into amino sugars during the incubation course, but inorganic N inputs altered the rate of plant-N accumulation in microbial-derived organic matters. Our results indicated that higher N availability had a positive impact on the accumulation or stabilization of newly-produced microbial residues in the long term. (C) 2011 Elsevier Ltd. All rights reserved.
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000294942300026
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/121997]
专题	中国科学院沈阳应用生态研究所
通讯作者	Zhang, Xudong
作者单位	1.Chinese Acad Sci, State Key Lab Forest & Soil Ecol, Inst Appl Ecol, Shenyang 110016, Liaoning, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 3.Chinese Acad Sci, Key Lab Mollisols Agroecol, NE Inst Geog & Agroecol, Harbin 150081, Peoples R China
推荐引用方式 GB/T 7714	Ding, Xueli,He, Hongbo,Zhang, Bin,et al. Plant-N incorporation into microbial amino sugars as affected by inorganic N addition: A microcosm study of (15)N-labeled maize residue decomposition[J]. SOIL BIOLOGY & BIOCHEMISTRY,2011,43(9):1968-1974.
APA	Ding, Xueli,He, Hongbo,Zhang, Bin,&Zhang, Xudong.(2011).Plant-N incorporation into microbial amino sugars as affected by inorganic N addition: A microcosm study of (15)N-labeled maize residue decomposition.SOIL BIOLOGY & BIOCHEMISTRY,43(9),1968-1974.
MLA	Ding, Xueli,et al."Plant-N incorporation into microbial amino sugars as affected by inorganic N addition: A microcosm study of (15)N-labeled maize residue decomposition".SOIL BIOLOGY & BIOCHEMISTRY 43.9(2011):1968-1974.