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  • Field-scale variability in site conditions explain phenotypic plasticity in response to nitrogen source in Pinus radiata D. Don

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    Accepted Manuscript (AM)
    Author(s)
    Gallart, Marta
    Love, Jonathan
    Meason, Dean F
    Coker, Graham
    Clinton, Peter W
    Xue, Jianming
    Jameson, Paula E
    Klapste, Jaroslav
    Turnbull, Matthew H
    Griffith University Author(s)
    Gallart Diumenge, Marta
    Year published
    2019
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    Abstract
    Aims: Productivity of forest ecosystems is constrained by site resource availability and utilisation at an individual tree level. A better understanding of nitrogen (N) nutrition addition to forest ecosystems is critical for maintaining optimal plantation productivity, given the influence of an environment gradient, genetics, and their interactions. Methods: We studied the aboveground growth response in a plantation setting of ten commercial P. radiata genotypes to N-fertilisation using three different N sources, and also assessed the effect of on-site environmental factors on this response. We compared, on equimolar basis, ...
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    Aims: Productivity of forest ecosystems is constrained by site resource availability and utilisation at an individual tree level. A better understanding of nitrogen (N) nutrition addition to forest ecosystems is critical for maintaining optimal plantation productivity, given the influence of an environment gradient, genetics, and their interactions. Methods: We studied the aboveground growth response in a plantation setting of ten commercial P. radiata genotypes to N-fertilisation using three different N sources, and also assessed the effect of on-site environmental factors on this response. We compared, on equimolar basis, the effect of N-fertilisation with inorganic N (NH4NO3), organic N (L-arginine), and the two N sources combined (L-arginine:NO3−) to that of unfertilised trees on tree height, diameter, descriptors of microsite variability, and climate and seasonal information. After 2.5 years of fertilisation, genotype-specific variation in aboveground growth response to N sources were measured, and these were significantly influenced by field-scale heterogeneity. Results: Across P. radiata genotypes, trees treated with inorganic N forms showed suppressed growth compared to unfertilised trees, while trees fertilised with organic N (either alone or in combination with inorganic N) were not significantly different than the untreated controls. We provide evidence of significant interactions between N source and genotype, N source and cover as well as genotype and microsite variability affecting temporal trends in tree volume. Conclusions: We conclude that the comprehension of field-scale variability in soil properties and associated environmental variables is essential for understanding genotype performance as they are crucial determinants of intraspecific variation in response to N-fertilisation.
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    Journal Title
    Plant and Soil
    Volume
    443
    Issue
    1-2
    DOI
    https://doi.org/10.1007/s11104-019-04237-0
    Copyright Statement
    © 2019 Springer Netherlands. This is an electronic version of an article published in Plant and Soil, 443, pages 353–368 (2019). Plant and Soil is available online at: http://link.springer.com/ with the open URL of your article.
    Subject
    Environmental sciences
    Biological sciences
    Agricultural, veterinary and food sciences
    Science & Technology
    Life Sciences & Biomedicine
    Agronomy
    Plant Sciences
    Soil Science
    Publication URI
    http://hdl.handle.net/10072/397425
    Collection
    • Journal articles

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