LteifWhalenBradleyEtAl2010

Référence

Lteif, A., Whalen, J.K., Bradley, R.L., Camire, C. (2010) Nitrogen transformations revealed by isotope dilution in an organically fertilized hybrid poplar plantation. Plant and Soil, 333(1):105-116. (URL )

Résumé

Measuring nitrogen (N) transformations from organic fertilizers can help in selecting applications rates that provide sufficient soluble N to promote tree growth in short-rotation plantations. The objective of this study was to determine how organic fertilizers (papermill biosolids, liquid pig slurry) affected microbially-mediated N transformations in soils. Soil samples were collected from a hybrid poplar plantation before fertilization, 1 month after fertilizer application and at the end of the growing season. Net N mineralization and nitrification were evaluated during a 28 d laboratory incubation, while gross N transformations were assessed using a 15N isotope dilution technique. Pig slurry application increased soil ammonium (NH4-N) and nitrate (NO3-N) concentrations within 1 month, while papermill biosolids increased soil NH4-N and NO3-N concentrations at the end of the growing season. Gross N consumption rates were greater than gross N production rates. The NH4-N and NO3-N consumption rates were positively correlated with labile carbon and microbial biomass. The gross nitrification rate was 18 to 67% of the gross mineralization rate but 30% or less of the gross NH4-N consumption rate, indicating that NH4 consumption was overestimated by the isotope dilution technique. We conclude that N cycling in this hybrid poplar plantation was characterized by rapid consumption of plant-available N following N mineralization and nitrification.

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@ARTICLE { LteifWhalenBradleyEtAl2010,
    AUTHOR = { Lteif, A. and Whalen, J.K. and Bradley, R.L. and Camire, C. },
    TITLE = { Nitrogen transformations revealed by isotope dilution in an organically fertilized hybrid poplar plantation },
    JOURNAL = { Plant and Soil },
    YEAR = { 2010 },
    VOLUME = { 333 },
    PAGES = { 105-116 },
    NUMBER = { 1 },
    ABSTRACT = { Measuring nitrogen (N) transformations from organic fertilizers can help in selecting applications rates that provide sufficient soluble N to promote tree growth in short-rotation plantations. The objective of this study was to determine how organic fertilizers (papermill biosolids, liquid pig slurry) affected microbially-mediated N transformations in soils. Soil samples were collected from a hybrid poplar plantation before fertilization, 1 month after fertilizer application and at the end of the growing season. Net N mineralization and nitrification were evaluated during a 28 d laboratory incubation, while gross N transformations were assessed using a 15N isotope dilution technique. Pig slurry application increased soil ammonium (NH4-N) and nitrate (NO3-N) concentrations within 1 month, while papermill biosolids increased soil NH4-N and NO3-N concentrations at the end of the growing season. Gross N consumption rates were greater than gross N production rates. The NH4-N and NO3-N consumption rates were positively correlated with labile carbon and microbial biomass. The gross nitrification rate was 18 to 67% of the gross mineralization rate but 30% or less of the gross NH4-N consumption rate, indicating that NH4 consumption was overestimated by the isotope dilution technique. We conclude that N cycling in this hybrid poplar plantation was characterized by rapid consumption of plant-available N following N mineralization and nitrification. },
    ISSN = { 0032-079X },
    KEYWORDS = { Biomedical and Life Sciences },
    OWNER = { Luc },
    PUBLISHER = { Springer Netherlands },
    TIMESTAMP = { 2010.10.01 },
    URL = { http://dx.doi.org/10.1007/s11104-010-0326-1 },
}

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