N capture by Plantago lanceolata and Brassica napus from organic material: the influence of spatial dispersion, plant competition and an arbuscular mycorrhizal fungus

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Abstract

This study investigated N capture by Plantago lanceolata L. and Brassica napus L. from complex organic material (dual-labelled with N-15/C-13) added either as a thin concentrated layer (discrete patch treatment) or dispersed uniformly with the background sand:soil mix in a 10 cm band (dispersed treatment) when grown in monoculture or in interspecific competition and in the presence or absence of a mycorrhizal inoculum (Glomus mosseae). No C-13 enrichments from the organic material were detected in the plant tissues, but N-15 enrichments were present. Total plant uptake of N from the organic material on a microcosm basis was not affected by the spatial placement of the organic material, but Plantago monocultures captured less N than the species in interspecific competition (i.e. 23% versus 38% of the N originally added). N capture from Brassica monocultures was no different to either Plantago monocultures or both species in mixture. However, N capture from the organic material by both individual Plantago and Brassica plants was reduced when grown with Brassica plants (by 10-fold and by more than half, respectively). N capture from the organic material was directly related to the estimated root length produced in the sections containing the organic material: the individual that produced the greatest root length captured most N. Strikingly, when the organic material was added as a discrete patch the N captured by Brassica, a non-mycorrhizal species, actually increased when the G. mosseae inoculum was present compared to when G. mosseae was absent (i.e. 35% versus 19% of the N originally added).

Original languageEnglish
Pages (from-to)2331-2342
Number of pages12
JournalJournal of Experimental Botany
Volume54
Issue number391
DOIs
Publication statusPublished - 1 Oct 2003

Keywords

  • arbuscular mycorrhizal fungus
  • Brassica napus L.
  • decomposition
  • nitrogen capture
  • organic material
  • Plantago lanceolata L.
  • root demography
  • LOCALIZED SOIL ENRICHMENT
  • NITROGEN-RICH PATCHES
  • ROOT PROLIFERATION
  • LOLIUM-PERENNE
  • FIELD
  • RESPONSES
  • PHOSPHATE
  • GLYCINE
  • GROWTH
  • HYPHAE

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