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Biochar–root interactions are mediated by biochar nutrient content and impacts on soil nutrient availability

Prendergast‐Miller, M. T ; Duvall, M ; Sohi, S. P

European journal of soil science, 2014, Vol.65 (1), p.173-185 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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  • Título:
    Biochar–root interactions are mediated by biochar nutrient content and impacts on soil nutrient availability
  • Autor: Prendergast‐Miller, M. T ; Duvall, M ; Sohi, S. P
  • Assuntos: biochar ; Hordeum ; Hordeum vulgare ; Miscanthus ; nutrient availability ; nutrient content ; phosphorus ; rhizosphere ; root growth ; Salix ; soil ; soil nutrients ; spring barley ; weathering
  • É parte de: European journal of soil science, 2014, Vol.65 (1), p.173-185
  • Notas: http://dx.doi.org/10.1111/ejss.12079
    Scottish Funding Council
    ArticleID:EJSS12079
    istex:233531EC79E5E75B096E19B8C2802C33E6AD9D23
    ark:/67375/WNG-4SNRMP5S-L
    Table S1: anova summary table for plant shoot analyses given in Table .Table S2: anova summary table for plant root analyses given in Table .
    EU COST Action - No. TD1107
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Roots are the first point of contact between biochar particles and growing plants, yet detailed studies of biochar–root interactions are few. Biochar may affect root growth, and therefore plant performance, through two mechanisms: (i) as a direct nutrient source and (ii) through impacts on nutrient availability. To test the hypothesis that biochar–root interactions occur and are determined by biochar nutrient supply and impacts on soil nutrients, spring barley (Hordeum vulgare L.) was grown with and without biochar addition in rhizobox mesocosms. Biochar from unaltered and artificially weathered Miscanthus or willow (Salix sp) biochar types was used and was manipulated to alter its structure and nutrient content. After 28 days of plant growth, biochar nutrient content, soil nutrient content and the amount of biochar were measured in the bulk soil, the rhizosphere and the rhizosheath. Plants in biochar‐amended soils had larger rhizosphere zones than the control treatment. The rhizosphere contained more biochar particles than the bulk soil, an indication that roots preferred soil containing biochar particles. Biochar particles retained soil nitrogen (N) in the form of nitrate, and also supplied phosphorus (P) to the soil and plant. Miscanthus biochar had a larger extractable P content than the Salix biochar, with different effects on plant growth and root responses. Although artificial physical weathering had no effect on overall plant growth, weathering effects on N retention and P content were dependent on biochar type. Our results indicate that roots are attracted towards biochar, resulting in its partitioning between bulk and rhizosphere soil. Biochar thus controls plant root nutrient acquisition directly as a nutrient source and indirectly by altering soil nutrient content.
  • Editor: Oxford, UK: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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