Alterations of pathways in fertilizer N conservation and supply in soils treated with dicyandiamide, hydroquinone and glucose

doi:10.1016/j.apsoil.2016.07.016

	Alterations of pathways in fertilizer N conservation and supply in soils treated with dicyandiamide, hydroquinone and glucose
	Xu, Yonggang 1; Pan, Feifei 1,2; Yu, Wantai 1; Ma, Qiang 1; Wang, Jing 3; Zhou, Hua 1; Jiang, Chunming 1
刊名	APPLIED SOIL ECOLOGY
	2016-12-01
卷号	108 页码:108-117
关键词	Inhibitor Soil Microbial Biomass n Fixed Ammonium Nitrogen Transformation
ISSN号	0929-1393
DOI	10.1016/j.apsoil.2016.07.016
英文摘要	Nitrogen (N) immobilization by microorganisms and NH4+ fixation by soil minerals are common reactions responsible for fertilizer N retention in soils. However, the relationship between microbial immobilization and NH4+ fixation remains unclear to date, and the availability of immobilized or fixed fertilizer N has yet to be compared. Accordingly, we conducted a 96-day incubation experiment to study the effects of the nitrification inhibitor dicyandiamide (DCD), the urease inhibitor hydroquinone (HQ), and glucose adding on N-15-labeled urea-N partitioning in different N pools and on the subsequent remineralization of immobilized N and release of fixed NH4+. Glucose significantly increased N retention in soil but decreased the availability of urea-derived N because a great proportion of urea-derived N was transformed into soil microbial necromass N (SMNN). In the non-glucose treatments, the effects of the fixed NH4+ pool on the conservation and supply of urea-derived N were 1.6-fold and 2.7-fold greater on average than those of the organic N pool (including soil microbial biomass N and SMNN), respectively, from the 12th day to the end of the incubation. In the glucose treatments, the corresponding effects of the organic N pool were 3.7-fold and 3.0-fold greater than those of the fixed NH4+ pool. Both inhibitors raised urea-derived fixed NH4+ but exhibited different influences on urea-derived organic N; in particular, DCD input increased urea-derived organic N, whereas HQ input decreased this parameter. The combination of glucose and DCD further decreased the availability of urea-derived N, but HQ alleviated the decline of urea-derived N availability induced by glucose input. Microbial immobilization and nitrification comparably contributed to the release of urea-derived fixed NH4+ in soil treated with urea alone. In the presence of glucose, microbial immobilization was the principal driving force of fixed NH4+ release, and this tendency was further enhanced by DCD but mitigated by HQ. The partitioning of released fixed NH4+ between the organic N pool (immobilization) and the mineral N pool (nitrification) can be clarified by comparing the path coefficients under different conditions. These results provide valuable information for combining the abiotic and biotic processes in N cycling after fertilizer N application and for quantifying N transformation in soils. (C) 2016 Elsevier B.V. All rights reserved.
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000386643800013
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/122866]
专题	中国科学院沈阳应用生态研究所
通讯作者	Ma, Qiang
作者单位	1.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shenyang 1 High Sch, Shenyang 110042, Peoples R China
推荐引用方式 GB/T 7714	Xu, Yonggang,Pan, Feifei,Yu, Wantai,et al. Alterations of pathways in fertilizer N conservation and supply in soils treated with dicyandiamide, hydroquinone and glucose[J]. APPLIED SOIL ECOLOGY,2016,108:108-117.
APA	Xu, Yonggang.,Pan, Feifei.,Yu, Wantai.,Ma, Qiang.,Wang, Jing.,...&Jiang, Chunming.(2016).Alterations of pathways in fertilizer N conservation and supply in soils treated with dicyandiamide, hydroquinone and glucose.APPLIED SOIL ECOLOGY,108,108-117.
MLA	Xu, Yonggang,et al."Alterations of pathways in fertilizer N conservation and supply in soils treated with dicyandiamide, hydroquinone and glucose".APPLIED SOIL ECOLOGY 108(2016):108-117.