Organic nitrogen enhances nitrogen nutrition and early growth of Pinus sylvestris seedlings. Lim, H., Jämtgård, S., Oren, R., Gruffman, L., Kunz, S., & Näsholm, T. Tree Physiology, September, 2021. ![Organic nitrogen enhances nitrogen nutrition and early growth of Pinus sylvestris seedlings [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Boreal trees are capable of taking up organic nitrogen (N) as effectively as inorganic N. Depending on the abundance of soil N forms, plants may adjust physiological and morphological traits to optimize N uptake. However, the link between these traits and N uptake in response to soil N sources is poorly understood. We examined Pinus sylvestris seedlings’ biomass growth and allocation, transpiration, and N uptake in response to additions of organic (the amino acid arginine) or inorganic N (ammonium-nitrate). We also monitored in-situ soil N fluxes in the pots following an addition of N, using a microdialysis system. Supplying organic N resulted in a stable soil N flux, whereas the inorganic N resulted in a sharp increase of nitrate flux followed by a rapid decline, demonstrating a fluctuating N supply and a risk for loss of nitrate from the growth medium. Seedlings supplied with organic N achieved a greater biomass with a higher N content, thus reaching a higher N recovery compared with those supplied inorganic N. In spite of a higher N concentration in organic N seedlings, root-to-shoot ratio and transpiration per unit leaf area were similar to those of inorganic N seedlings. We conclude that enhanced seedlings’ nutrition and growth under the organic N source may be attributed to a stable supply of N, owing to a strong retention rate in the soil medium.
@article{lim_organic_2021,
title = {Organic nitrogen enhances nitrogen nutrition and early growth of {Pinus} sylvestris seedlings},
issn = {1758-4469},
url = {https://doi.org/10.1093/treephys/tpab127},
doi = {10.1093/treephys/tpab127},
abstract = {Boreal trees are capable of taking up organic nitrogen (N) as effectively as inorganic N. Depending on the abundance of soil N forms, plants may adjust physiological and morphological traits to optimize N uptake. However, the link between these traits and N uptake in response to soil N sources is poorly understood. We examined Pinus sylvestris seedlings’ biomass growth and allocation, transpiration, and N uptake in response to additions of organic (the amino acid arginine) or inorganic N (ammonium-nitrate). We also monitored in-situ soil N fluxes in the pots following an addition of N, using a microdialysis system. Supplying organic N resulted in a stable soil N flux, whereas the inorganic N resulted in a sharp increase of nitrate flux followed by a rapid decline, demonstrating a fluctuating N supply and a risk for loss of nitrate from the growth medium. Seedlings supplied with organic N achieved a greater biomass with a higher N content, thus reaching a higher N recovery compared with those supplied inorganic N. In spite of a higher N concentration in organic N seedlings, root-to-shoot ratio and transpiration per unit leaf area were similar to those of inorganic N seedlings. We conclude that enhanced seedlings’ nutrition and growth under the organic N source may be attributed to a stable supply of N, owing to a strong retention rate in the soil medium.},
number = {tpab127},
urldate = {2021-10-01},
journal = {Tree Physiology},
author = {Lim, Hyungwoo and Jämtgård, Sandra and Oren, Ram and Gruffman, Linda and Kunz, Sabine and Näsholm, Torgny},
month = sep,
year = {2021},
}
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We examined Pinus sylvestris seedlings’ biomass growth and allocation, transpiration, and N uptake in response to additions of organic (the amino acid arginine) or inorganic N (ammonium-nitrate). We also monitored in-situ soil N fluxes in the pots following an addition of N, using a microdialysis system. Supplying organic N resulted in a stable soil N flux, whereas the inorganic N resulted in a sharp increase of nitrate flux followed by a rapid decline, demonstrating a fluctuating N supply and a risk for loss of nitrate from the growth medium. Seedlings supplied with organic N achieved a greater biomass with a higher N content, thus reaching a higher N recovery compared with those supplied inorganic N. In spite of a higher N concentration in organic N seedlings, root-to-shoot ratio and transpiration per unit leaf area were similar to those of inorganic N seedlings. We conclude that enhanced seedlings’ nutrition and growth under the organic N source may be attributed to a stable supply of N, owing to a strong retention rate in the soil medium.","number":"tpab127","urldate":"2021-10-01","journal":"Tree Physiology","author":[{"propositions":[],"lastnames":["Lim"],"firstnames":["Hyungwoo"],"suffixes":[]},{"propositions":[],"lastnames":["Jämtgård"],"firstnames":["Sandra"],"suffixes":[]},{"propositions":[],"lastnames":["Oren"],"firstnames":["Ram"],"suffixes":[]},{"propositions":[],"lastnames":["Gruffman"],"firstnames":["Linda"],"suffixes":[]},{"propositions":[],"lastnames":["Kunz"],"firstnames":["Sabine"],"suffixes":[]},{"propositions":[],"lastnames":["Näsholm"],"firstnames":["Torgny"],"suffixes":[]}],"month":"September","year":"2021","bibtex":"@article{lim_organic_2021,\n\ttitle = {Organic nitrogen enhances nitrogen nutrition and early growth of {Pinus} sylvestris seedlings},\n\tissn = {1758-4469},\n\turl = {https://doi.org/10.1093/treephys/tpab127},\n\tdoi = {10.1093/treephys/tpab127},\n\tabstract = {Boreal trees are capable of taking up organic nitrogen (N) as effectively as inorganic N. Depending on the abundance of soil N forms, plants may adjust physiological and morphological traits to optimize N uptake. However, the link between these traits and N uptake in response to soil N sources is poorly understood. We examined Pinus sylvestris seedlings’ biomass growth and allocation, transpiration, and N uptake in response to additions of organic (the amino acid arginine) or inorganic N (ammonium-nitrate). We also monitored in-situ soil N fluxes in the pots following an addition of N, using a microdialysis system. Supplying organic N resulted in a stable soil N flux, whereas the inorganic N resulted in a sharp increase of nitrate flux followed by a rapid decline, demonstrating a fluctuating N supply and a risk for loss of nitrate from the growth medium. Seedlings supplied with organic N achieved a greater biomass with a higher N content, thus reaching a higher N recovery compared with those supplied inorganic N. 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