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dc.contributorBattie-laclaua, Patriciaen_US
dc.contributorDufour, Lydieen_US
dc.contributorWery, Jacquesen_US
dc.contributorDupraz, Christianen_US
dc.creatorquerne, aurelieen_US
dc.identifier.citationAurelie querne, Patricia Battie-laclaua, Lydie Dufour, Jacques Wery, Christian Dupraz. (31/3/2017). Effects of walnut trees on biological nitrogen fixation and yield of intercropped alfalfa in a Mediterranean agroforestry system. European Journal of Agronomy, 84, pp. 35-46.en_US
dc.description.abstracttWhile intercropping annual non nitrogen-fixing crops with deciduous hardwood species is now welldocumented, there is a need to investigate if nitrogen-fixing intercrops may succeed in agroforestrysystems. Intercropping with trees usually leads to a decline in crop yield, and could in addition possiblyreduce the biological N fixation (BNF) over time due to the competition for resources. In a Mediterraneanexperimental site, 17 year-old hybrid walnut trees (Juglans nigra x Juglans regia L.) planted in East-Westoriented lines were intercropped with alfalfa (Medicago sativa L.) to assess the impact of competition forlight and water on alfalfa yield and BNF. Alfalfa yield and shoot 15N values (a proxy for the proportionof N derived from the air, %Ndfa) were measured during one year at different distances from the treerow in two directions (north and south). Alfalfa yield was reduced close to the tree row (−28% and−22% on the northern and southern sides respectively), but less than the reduction of irradiation (−59%and −33% respectively). Shading improved by 35% the apparent light use efficiency (LUE: abovegroundbiomass produced per unit of global radiation) of alfalfa, indicating that alfalfa was shade tolerant at thisMediterranean site. Alfalfa shoot 15N values were lower close to the tree rows than at mid inter-row: BNFwas stimulated close to the trees. Compensative and facilitative mechanisms between trees and alfalfaplants led to a rise in LUE and%Ndfa in shaded areas. These results contradict the frequent assumptionthat N fixation is reduced in the shade of trees. Appropriate tree canopy management may help maintainlight competition between trees and alfalfa to a level that still enhance complementary, which wouldfurther improve the sustainability of the use of alfalfa as an intercrop in Mediterranean regions.en_US
dc.sourceEuropean Journal of Agronomy;84,(2016) Pagination 35,46en_US
dc.subjectlight use efficiencyen_US
dc.subjectlight and water competitionen_US
dc.subjectjuglans regia x nigraen_US
dc.subjectbiological n fixationen_US
dc.titleEffects of walnut trees on biological nitrogen fixation and yield of intercropped alfalfa in a Mediterranean agroforestry systemen_US
dc.typeJournal Articleen_US
cg.creator.idWery, Jacques: 0000-0003-0014-4541en_US
cg.subject.agrovocshade toleranceen_US
cg.contributor.centerFrench National Research Institute for Agriculture, Food and Environment - INRAE Franceen_US
cg.contributor.centerMontpellier SupAgro - SupAgroen_US
cg.contributor.funderCGIAR System Organization - CGIARen_US
cg.coverage.regionWestern Europeen_US
dc.identifier.statusTimeless limited accessen_US

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