Chemical composition of organic matter in a deep soil changed with a positive priming effect due to glucose addition as investigated by C-13 NMR spectroscopy

	Chemical composition of organic matter in a deep soil changed with a positive priming effect due to glucose addition as investigated by C-13 NMR spectroscopy
	Y. L. Zhang; S. H. Yao; J. D. Mao; D. C. Olk; X. Y. Cao; B. Zhang
刊名	Soil Biology & Biochemistry
	2015
卷号	85 页码:137-144
通讯作者	张斌
中文摘要	Fresh organic carbon becomes more accessible to deep soil following losses of surface soil and deep intentional incorporation of crop residues, which can cause the priming effect and influence the quality and quantity of SOC in deep soil. This study determined the priming effect due to addition of water-dissolved C-13-labeled glucose (0.4 g C kg(-1) soil) to a soil taken from 1.00 to 1.20 m depth. The changes in chemical compositions of SOC in soils without (G(0)) and with (G(0.4)) glucose addition during a 31-d incubation were investigated with solid-state C-13 cross polarization/total sideband suppression (C-13-CP/TOSS) and CP/TOSS with dipolar dephasing nuclear magnetic resonance (NMR) techniques. No glucose remained in the soil after 21 days of incubation, with 48% being completely mineralized into CO2 emission and 52% being incorporated into SOC. The native SOC was decomposed by 0.23% more in G(0.4) than in Go. The NMR spectra demonstrated that both labile and recalcitrant organic compounds in SOC changed during the incubation, but in different manners in G(0) and G(0.4). During the incubation, the -(CH2)(n)-abundance in Go did not change over time, but in G(0.4) it decreased from Day 0 to Day 21 and then increased from Day 21 to Day 31, suggesting shifts of soil microbial communities only in G(0.4). After the incubation, in Go the abundances of ketones/aldehydes and nonpolar alkyl C increased, but those of aromatic C C and protonated O-alkyl C (OCH) decreased; In G(0.4), the abundances of NCH and protonated O-alkyl C (OCH) increased, but those of nonpolar alkyl C and nonprotonated aromatic C-O and ketones/aldehydes decreased. Such inconsistent changes in recalcitrant compounds between Go and G(0.4) indicated that glucose addition likely primed the decomposition of aromatic C-O and suppressed the formation of ketones/aldehydes. We have demonstrated for the first time that the priming effect of SOC decomposition in the deep soil was involved with larger notable changes in both labile and recalcitrant structures of native SOC due to glucose addition compared with that without glucose addition. (C) 2015 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://159.226.123.10/handle/131322/6427]
专题	东北地理与农业生态研究所_土壤物质循环学科组_期刊论文
推荐引用方式 GB/T 7714	Y. L. Zhang,S. H. Yao,J. D. Mao,et al. Chemical composition of organic matter in a deep soil changed with a positive priming effect due to glucose addition as investigated by C-13 NMR spectroscopy[J]. Soil Biology & Biochemistry,2015,85:137-144.
APA	Y. L. Zhang,S. H. Yao,J. D. Mao,D. C. Olk,X. Y. Cao,&B. Zhang.(2015).Chemical composition of organic matter in a deep soil changed with a positive priming effect due to glucose addition as investigated by C-13 NMR spectroscopy.Soil Biology & Biochemistry,85,137-144.
MLA	Y. L. Zhang,et al."Chemical composition of organic matter in a deep soil changed with a positive priming effect due to glucose addition as investigated by C-13 NMR spectroscopy".Soil Biology & Biochemistry 85(2015):137-144.