Foliar retention of 15N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems

doi:https://doi.org/10.1016/S0378-1127(97)00185-0

Title: Foliar retention of ¹⁵N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems

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Abstract

Nitrogen-15 ({sup 15}N) labelled ammonium and nitrate were applied to understory saplings in a low-elevation deciduous forest and a high-elevation coniferous forest during the 1993 growing season to estimate the minimum retention of inorganic N from wet deposition. Tissue samples were collected at both sites before and after the tracer applications to determine the initial and the final {sup 15}N content. The fraction of the tracer application retained by deciduous leaves or by current-year leaves and stems on conifers was calculated from measurements of {sup 15}N and total N content. At both study sites, tracer applications significantly increased the {sup 15}N content of sapling tissues, although there was no significant difference between the fractional retention of ammonium and nitrate. The results support earlier studies indicating that the foliar retention of {sup 15}N applied in simulated wet deposition is small. Our estimates of annual N uptake from wet deposition by the forest canopy at the low- and high-elevation study sites were only 14 and 7%, respectively. This study, along with prior studies of the different chemical forms of N deposition, indicates that canopy uptake of dry N deposition is a major contributor to the net canopy exchange of N in bothmore » forests.« less

Authors:

Garten, Jr, Charles T ^[1]; Schwab, Alison ^[1]; Shirshac, Terri ^[1]

ORNL

Publication Date:: 1998-04-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Oak Ridge National Environmental Research Park

OSTI Identifier:: 989689

DOE Contract Number:: DE-AC05-00OR22725

Resource Type:: Journal Article

Journal Name:: Forest Ecology and Management

Additional Journal Information:: Journal Volume: 103; Journal Issue: 2-3; Journal ID: ISSN 0378-1127

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES; CONIFERS; DEPOSITION; ECOSYSTEMS; FORESTS; NITRATES; NITROGEN 15; RETENTION; SEASONS; WASHOUT

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                    Garten, Jr, Charles T, Schwab, Alison, and Shirshac, Terri. Foliar retention of 15N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems.  United States: N. p., 1998. 
        Web.  doi:10.1016/S0378-1127(97)00185-0.

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                    Garten, Jr, Charles T, Schwab, Alison, & Shirshac, Terri. Foliar retention of 15N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems.  United States.  https://doi.org/10.1016/S0378-1127(97)00185-0

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                    Garten, Jr, Charles T, Schwab, Alison, and Shirshac, Terri. Wed .  
        "Foliar retention of 15N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems".  United States.  https://doi.org/10.1016/S0378-1127(97)00185-0.

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@article{osti_989689,

  title        = {Foliar retention of 15N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems},

  author       = {Garten, Jr, Charles T and Schwab, Alison and Shirshac, Terri},

  abstractNote = {Nitrogen-15 ({sup 15}N) labelled ammonium and nitrate were applied to understory saplings in a low-elevation deciduous forest and a high-elevation coniferous forest during the 1993 growing season to estimate the minimum retention of inorganic N from wet deposition. Tissue samples were collected at both sites before and after the tracer applications to determine the initial and the final {sup 15}N content. The fraction of the tracer application retained by deciduous leaves or by current-year leaves and stems on conifers was calculated from measurements of {sup 15}N and total N content. At both study sites, tracer applications significantly increased the {sup 15}N content of sapling tissues, although there was no significant difference between the fractional retention of ammonium and nitrate. The results support earlier studies indicating that the foliar retention of {sup 15}N applied in simulated wet deposition is small. Our estimates of annual N uptake from wet deposition by the forest canopy at the low- and high-elevation study sites were only 14 and 7%, respectively. This study, along with prior studies of the different chemical forms of N deposition, indicates that canopy uptake of dry N deposition is a major contributor to the net canopy exchange of N in both forests.},

  doi          = {10.1016/S0378-1127(97)00185-0},

  url          = {https://www.osti.gov/biblio/989689},
  journal      = {Forest Ecology and Management},

  issn         = {0378-1127},

  number       = 2-3,

  volume       = 103,

  place        = {United States},

  year         = {1998},

  month        = {4}

}

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https://doi.org/10.1016/S0378-1127(97)00185-0

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Title: Foliar retention of 15N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems

Abstract

Citation Formats

Title: Foliar retention of ¹⁵N tracers: implications for net canopy exchange in low- and high-elevation forest ecosystems