NDLI: Cross-Ecosystem Comparisons of In Situ Plant Uptake of Amino Acid-N and NH4 +

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Cross-Ecosystem Comparisons of In Situ Plant Uptake of Amino Acid-N and NH4 +

Content Provider	Springer Nature Link
Author	McFarland, Jack W. Ruess, Roger W. Kielland, Knut Pregitzer, Kurt Hendrick, Ronald Allen, Michael
Copyright Year	2010
Abstract	Plant and microbial use of nitrogen (N) can be simultaneously mutualistic and competitive, particularly in ecosystems dominated by mycorrhizal fungi. Our goal was to quantify plant uptake of organic and inorganic N across a broad latitudinal gradient of forest ecosystems that varied with respect to overstory taxon, edaphic characteristics, and dominant mycorrhizal association. Using 13C and 15N, we observed in situ the cycling dynamics of NH4 + and glycine through various soil pools and fine roots over 14 days. Recovery of 15N as soil N varied with respect to N form, forest type, and sampling period; however, there were similarities in the cycling dynamics of glycine and NH4 + among all forest types. Microbial immobilization of 15N was immediately apparent for both treatments and represented the largest sink (~25%) for 15N among extractable soil N pools during the first 24 h. In contrast, fine roots were a relatively small sink (<10%) for both N forms, but fine root 13C enrichment indicated that plants in all forest types absorbed glycine intact, suggesting that plants and microbes effectively target the same labile soil N pools. Relative uptake of amino acid-N versus NH4 + varied significantly among sites and approximately half of this variation was explained by mycorrhizal association. Estimates of plant uptake of amino acid-N relative to NH4 + were 3× higher in ectomycorrhizal-dominated stands (1.6 ± 0.2) than arbuscular mycorrhizae-dominated stands (0.5 ± 0.1). We conclude that free amino acids are an important component of the N economy in all stands studied; however, in these natural environments plant uptake of organic N relative to inorganic N is explained as much by mycorrhizal association as by the availability of N forms per se.
Starting Page	177
Ending Page	193
Page Count	17
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	13
Issue Number	2
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-27
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	glycine ammonium 13C 15N microbial biomass N organic N uptake ectomycorrhizae arbuscular mycorrhizae boreal forest ecosystem temperate forest ecosystem Nature Conservation Geoecology/Natural Processes Environmental Management Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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Cross-Ecosystem Comparisons of In Situ Plant Uptake of Amino Acid-N and NH4+

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