N-15(2) as a tracer of biological N-2 fixation: A 75-year retrospective

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	N-15(2) as a tracer of biological N-2 fixation: A 75-year retrospective
	Chalk, Phillip M.; He, Ji-Zheng; Peoples, Mark B.; Chen, Deli
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2017-03-01
卷号	106 期号:0 页码:36-50
关键词	Biological N-2 Fixation N-15(2) Phototrophic Heterotrophic Diazotrophs Chambers
英文摘要	N-15(2) has played a crucial role in fundamental studies of biological N-2 fixation. However, due to operational constraints, it has more often served as a qualitative rather than a quantitative tracer of biologically-fixed N (BFN). Therefore indirect methods based either on N-15-enrichment or N-15-natural abundance have assumed a dominant role in quantifying N cycle processes involving BFN. However, it is only through the direct N-15(2) approach that biological N-2 fixation can be traced through the various components of the soil-plant system. Technological advances in the automated control of the chamber environment have made the N-15(2) technique more attractive to long-term studies. Thus the need to enclose plants in a chamber and maintain conditions conducive to plant growth should no longer be seen as a major obstacle to the use of N-15(2). The way is now open to evaluate the efficacy of indirect methods used to estimate the contribution of BFN to the N economies of crop and pasture systems, and the dynamics of BFN in agroecosystems. In addition, new applications of N-15(2) such as stable isotope probing are emerging, which have the potential to characterize non-cultivated diazotrophs in a range of environments. The role of biological N-2 fixation in the formation of reactive N in the environment and its relationship with the emission of the greenhouse gas N2O requires further investigation. (C) 2016 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39599]
专题	生态环境研究中心_土壤环境科学实验室
推荐引用方式 GB/T 7714	Chalk, Phillip M.,He, Ji-Zheng,Peoples, Mark B.,et al. N-15(2) as a tracer of biological N-2 fixation: A 75-year retrospective[J]. SOIL BIOLOGY & BIOCHEMISTRY,2017,106(0):36-50.
APA	Chalk, Phillip M.,He, Ji-Zheng,Peoples, Mark B.,&Chen, Deli.(2017).N-15(2) as a tracer of biological N-2 fixation: A 75-year retrospective.SOIL BIOLOGY & BIOCHEMISTRY,106(0),36-50.
MLA	Chalk, Phillip M.,et al."N-15(2) as a tracer of biological N-2 fixation: A 75-year retrospective".SOIL BIOLOGY & BIOCHEMISTRY 106.0(2017):36-50.