DOI: 10.1002/gbc.20069
Scopus记录号: 2-s2.0-84883151703
论文题名: Global assessment of limitation to symbiotic nitrogen fixation by phosphorus availability in terrestrial ecosystems using a meta-analysis approach
作者: Augusto L ; , Delerue F ; , Gallet-Budynek A ; , Achat D ; L
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 804
结束页码: 815
语种: 英语
英文关键词: meta-analysis
; phosphorus bioavailability
; symbiotic nitrogen fixation
Scopus关键词: Artificial medium
; Global analysis
; Indirect effects
; Meta-analysis
; P availabilities
; Symbiotic fixation
; Symbiotic nitrogen fixation
; Terrestrial ecosystems
; Biochemistry
; Biomass
; Ecosystems
; Experiments
; Nitrogen
; Phosphorus
; Soils
; Nitrogen fixation
; assessment method
; bioavailability
; growth
; meta-analysis
; nitrogen cycle
; nitrogen fixation
; nutrient limitation
; phosphate
; phosphorus
; soil type
; terrestrial ecosystem
; tropical soil
英文摘要: Symbiotic nitrogen fixation (SNF) is the main natural source of nitrogen (N) in terrestrial ecosystems worldwide. Previous studies have shown that fixation of N by plants can be limited by the availability of phosphorus (P) in soils. We used global meta-analysis to investigate how P availability controls SNF. In experiments in which plants were grown in an artificial medium, severe P deficiencies in the nutritive solution ([PO4] < 5-42 μM) depressed SNF flux through both a direct decrease in the plant fixation rate (i.e., decreased N fixed per unit of plant biomass) and an indirect effect (i.e., through plant biomass). In most experiments with plants grown in soils, SNF was proportional to plant biomass and was consequently only indirectly limited by P. Some cases using unfertilized and weathered soils (ultisols or oxisols), where plants were particularly P stressed, were an exception with both direct and indirect P limitations. Our global analysis of the P-SNF relationship indicated that P bioavailability commonly limited SNF flux. We conclude that the main driver of in situ P limitation is indirect via limitation of plant growth, except in certain cases where both indirect and direct constraints may play a role. These cases of severe P deficiency may be mainly found in weathered tropical soils of Africa and South America, probably in unfertilized croplands which are depleted in P due to repeated biomass harvests. Key Points Phosphorus (P) bioavailability limits symbiotic fixation of nitrogen (SNF)P limits N2-fixation through plant growth but has minor impact on fixation rateControl of global SNF by P is proportional to its effect on plant biomass ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77583
Appears in Collections: 气候变化事实与影响
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作者单位: INRA, UMR 1220 TCEM, 71 Ave. Edouard Bourlaux, FR-33883 Villenave d'Ornon, France; Bordeaux Sciences Agro, UMR 1220 TCEM, Gradignan, France
Recommended Citation:
Augusto L,, Delerue F,, Gallet-Budynek A,et al. Global assessment of limitation to symbiotic nitrogen fixation by phosphorus availability in terrestrial ecosystems using a meta-analysis approach[J]. Global Biogeochemical Cycles,2013-01-01,27(3)