DOI: 10.1002/2017JG004103
Scopus记录号: 2-s2.0-85042532815
论文题名: Nitrogen Fixation Inputs in Pasture and Early Successional Forest in the Brazilian Amazon Region: Evidence From a Claybox Mesocosm Study
作者: Davidson E.A. ; Markewitz D. ; de O. Figueiredo R. ; de Camargo P.B.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 2 起始页码: 712
结束页码: 721
语种: 英语
英文关键词: fixation
; nitrogen
; occult nitrogen
; pasture
; successional forest
Scopus关键词: Bos
; Poaceae
; Urochloa brizantha
英文摘要: The role of biological nitrogen fixation (BNF) during secondary forest succession and in tropical pastures has been investigated and debated for several decades. Here we present results of a replicated experimental study in a degraded cattle pasture of eastern Amazonia using mass balance and a 15N tracer in lined soil pit mesocosms with three treatments: (1) plant-free control plots, (2) pasture grass Brachiaria brizantha, and (3) regrowth of early successional secondary forest species. Accumulation of N in grass biomass slightly exceeded estimates of net N mineralization from the plant-free control plots but was within the margin of error, so inputs of BNF may not have been needed. In contrast, the secondary forest vegetation accumulated about 3 times as much biomass N annually as the net N mineralization estimate, suggesting at least some role for BNF. Based on isotopic and mass measurements of N-fixing species, BNF was estimated to contribute at least 27 ± 3% of mean annual plant uptake in the secondary forest regrowth vegetation plots. Although BNF is probably important for recuperation of tropical secondary forests following land use change, the majority of the N taken up by both grasses and secondary forest regrowth arose from mineralization of the stocks of soil N. ©2018. 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/114590
Appears in Collections: 气候减缓与适应
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作者单位: Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, United States; Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States; EMBRAPA Environment, Jaguariúna, Brazil; Centro de Energia Nuclear na Agricultura, University of São Paulo, Piracicaba, Brazil
Recommended Citation:
Davidson E.A.,Markewitz D.,de O. Figueiredo R.,et al. Nitrogen Fixation Inputs in Pasture and Early Successional Forest in the Brazilian Amazon Region: Evidence From a Claybox Mesocosm Study[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(2)