DOI: 10.1111/gcb.12880
论文题名: Nitrogen yield advantage from grass-legume mixtures is robust over a wide range of legume proportions and environmental conditions
作者: Suter M. ; Connolly J. ; Finn J.A. ; Loges R. ; Kirwan L. ; Sebastià M.-T. ; Lüscher A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 6 起始页码: 2424
结束页码: 2438
语种: 英语
英文关键词: Climate change mitigation
; Climatic gradient
; Food security
; N fertilizer replacement
; N uptake
; Protein
; Sustainable agriculture
; Sustainable intensification
; Symbiotic N2 fixation
Scopus关键词: alternative agriculture
; climate change
; environmental conditions
; fertilizer
; food security
; grass
; legume
; nitrogen fixation
; protein
; Poaceae
; nitrogen
; climate
; Europe
; Fabaceae
; grassland
; metabolism
; nitrogen fixation
; Poaceae
; temperature
; Climate
; Europe
; Fabaceae
; Grassland
; Nitrogen
; Nitrogen Fixation
; Poaceae
; Temperature
英文摘要: Current challenges to global food security require sustainable intensification of agriculture through initiatives that include more efficient use of nitrogen (N), increased protein self-sufficiency through homegrown crops, and reduced N losses to the environment. Such challenges were addressed in a continental-scale field experiment conducted over 3 years, in which the amount of total nitrogen yield (Ntot ) and the gain of N yield in mixtures as compared to grass monocultures (Ngainmix ) was quantified from four-species grass-legume stands with greatly varying legume proportions. Stands consisted of monocultures and mixtures of two N2 -fixing legumes and two nonfixing grasses. The amount of Ntot of mixtures was significantly greater (P ≤ 0.05) than that of grass monocultures at the majority of evaluated sites in all 3 years. Ntot and thus Ngainmix increased with increasing legume proportion up to one-third of legumes. With higher legume percentages, Ntot and Ngainmix did not continue to increase. Thus, across sites and years, mixtures with one-third proportion of legumes attained ~95% of the maximum Ntot acquired by any stand and had 57% higher Ntot than grass monocultures. Realized legume proportion in stands and the relative N gain in mixture (Ngainmix /Ntot in mixture) were most severely impaired by minimum site temperature (R = 0.70, P = 0.003 for legume proportion; R = 0.64, P = 0.010 for Ngainmix /Ntot in mixture). Nevertheless, the relative N gain in mixture was not correlated to site productivity (P = 0.500), suggesting that, within climatic restrictions, balanced grass-legume mixtures can benefit from comparable relative gains in N yield across largely differing productivity levels. We conclude that the use of grass-legume mixtures can substantially contribute to resource-efficient agricultural grassland systems over a wide range of productivity levels, implying important savings in N fertilizers and thus greenhouse gas emissions and a considerable potential for climate change mitigation. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61743
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute for Sustainability Sciences ISS, Agroscope, Reckenholzstrasse, Zürich, Switzerland; School of Mathematical Sciences, University College Dublin, Dublin 4, Ireland; Environment Research Centre, Teagasc, Johnstown Castle, Wexford, Ireland; Institute of Crop Science and Plant Breeding, Christian-Albrechts-University, Kiel, Germany; Waterford Institute of Technology, Cork Road, Waterford, Ireland; Forest Technology Centre of Catalonia, Solsona, Spain; Department HBJ ETSEA, University of Lleida, Lleida, Spain
Recommended Citation:
Suter M.,Connolly J.,Finn J.A.,et al. Nitrogen yield advantage from grass-legume mixtures is robust over a wide range of legume proportions and environmental conditions[J]. Global Change Biology,2015-01-01,21(6)