Soil nitrogen form and plant nitrogen uptake along a boreal forest productivity gradient. Nordin, A., Högberg, P., & Näsholm, T. Oecologia, 129(1):125–132, September, 2001.
Soil nitrogen form and plant nitrogen uptake along a boreal forest productivity gradient [link]Paper  doi  abstract   bibtex   
We present results from a study of soil solution concentrations of ammonium (NH4+), nitrate (NO3–), and amino acid N over one growing season along a local 90-m-long plant productivity gradient in a boreal forest. Three forest types are found along the gradient: an ericaceous dwarf-shrub type between 0 and 40 m, a low-herb type between 40 and 80 m, and a tall-herb type at 90 m. Soil sampling of the mor layer was performed in June, July, August and October in the three forest types. In addition, plant uptake of NH4+, NO3– and the amino acid glycine was investigated. A mixture of the three N forms was injected into the soil; one N form at a time was labeled with 15N, and in the case of glycine also with 13C. In the dwarf-shrub forest, where plant productivity was low, the soil N pool was strongly dominated by amino acid N. There, plants took up more NH4+ than NO3–. Glycine uptake did not differ significantly from either NH4+ or NO3– uptake. Along the gradient, soil concentrations of NH4+ and NO3– increased, as did plant productivity. In the low-herb forest NH4+ comprised a major portion of the soil N pool, and plants took up more NH4+ than NO3– or glycine. In the tall-herb forest, NO3– was as abundant as NH4+, and together these two N forms dominated the soil N pool. Here, plants took up nearly equal amounts of NO3– and NH4+, and this uptake exceeded that of glycine severalfold. Apart from the overall preference for NH4+ that plants exhibited throughout the gradient, the results show a correlation between soil concentrations of amino acids and NO3– and plant preferences for these N forms.
@article{nordin_soil_2001,
	title = {Soil nitrogen form and plant nitrogen uptake along a boreal forest productivity gradient},
	volume = {129},
	issn = {1432-1939},
	url = {https://doi.org/10.1007/s004420100698},
	doi = {10.1007/s004420100698},
	abstract = {We present results from a study of soil solution concentrations of ammonium (NH4+), nitrate (NO3–), and amino acid N over one growing season along a local 90-m-long plant productivity gradient in a boreal forest. Three forest types are found along the gradient: an ericaceous dwarf-shrub type between 0 and 40 m, a low-herb type between 40 and 80 m, and a tall-herb type at 90 m. Soil sampling of the mor layer was performed in June, July, August and October in the three forest types. In addition, plant uptake of NH4+, NO3– and the amino acid glycine was investigated. A mixture of the three N forms was injected into the soil; one N form at a time was labeled with 15N, and in the case of glycine also with 13C. In the dwarf-shrub forest, where plant productivity was low, the soil N pool was strongly dominated by amino acid N. There, plants took up more NH4+ than NO3–. Glycine uptake did not differ significantly from either NH4+ or NO3– uptake. Along the gradient, soil concentrations of NH4+ and NO3– increased, as did plant productivity. In the low-herb forest NH4+ comprised a major portion of the soil N pool, and plants took up more NH4+ than NO3– or glycine. In the tall-herb forest, NO3– was as abundant as NH4+, and together these two N forms dominated the soil N pool. Here, plants took up nearly equal amounts of NO3– and NH4+, and this uptake exceeded that of glycine severalfold. Apart from the overall preference for NH4+ that plants exhibited throughout the gradient, the results show a correlation between soil concentrations of amino acids and NO3– and plant preferences for these N forms.},
	language = {en},
	number = {1},
	urldate = {2021-11-02},
	journal = {Oecologia},
	author = {Nordin, Annika and Högberg, Peter and Näsholm, Torgny},
	month = sep,
	year = {2001},
	pages = {125--132},
}

Downloads: 0