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Intercropping effect on root growth and nitrogen uptake at different nitrogen levels

Journal of Plant Ecology 2015年第4期8卷 380-389页

作者： Javier Ramirez-Garcia Helle J.Martens Miguel Quemada Kristian Thorup-Kristensen Dpto.Producción Vegetal:Fitotecnia ETSI AgrónomosAvd.Complutense s/nUniversidad Politécnica de Madrid28040 MadridSpain Department of Plant and Environmental Sciences University of CopenhagenHøjbakkegaards Alle 13DK-2630TaastrupDenmark

Aims Intercropping legumes and non-legumes may affect the root growth of both components in the mixture,and the non-legume is known to be strongly favored by increasing nitrogen(n)*** knowledge of how root systems affect the growth of the individual species is useful for understanding the interactions in intercrops as well as for planning cover cropping *** aim of this work was(i)to determine if different levels of n in the topsoil influence root depth(rD)and intensity of barley and vetch as sole crops or as an inter-cropped mixture and(ii)to test if the choice of a mixture or the n availability in the topsoil will influence the n uptake by deep *** In this study,we combined rhizotron studies with root extraction and species identification by microscopy with studies of growth,n uptake and 15n uptake from deeper soil layers,for studying the root interactions of root growth and n foraging for barley(Hordeum vul-gare l.)and vetch(Vicia sativa l.),frequently grown in mixtures as cover crops.n was added at 0(n0),50(n1)and 150(n2)kg n ha−*** roots discrimination relying on the anatomical and morphologi-cal differences observed between dicots and monocots proved to be a reliable method providing valuable data for the *** Findingsthe intercrop and the barley attained slightly higher root intensity(rI)and rD than the vetch,with values around 150 crosses m−1 and 1.4 m,respectively,compared to 50 crosses m−1 and 0.9 m for the *** deep soil layers,intercropping showed slightly larger rI values compared to the sole-cropped *** barley and the intercropping had larger root length density(r D)values(200-600 m m−3)than the vetch(25-130)at 0.8-1.2 m *** topsoil n supply did not show a clear effect on the rI,rD or r D;however,increasing topsoil n favored the proliferation of vetch roots in the intercropping at deep soil layers,with the barley:vetch root ratio ranging from 25 at n0 to 5 at *** n uptake of the barley was

关键词： grasses legumes cover crops crop mixture root discrimination labeled n

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