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Title: Nitrogen saturation and soil N availability in a high-elevation spruce and fir forest

Abstract

A field study was conducted during the summer of 1995 to gain abetter understanding of the causes of nitrate (NO{sub 3}-N) leaching and ongoing changes in soil nitrogen (N) availability in high-elevation (1524-2000 m) spruce (Picea rubens) and fir (Abies fraseri) forests of the Great Smoky Mountains National Park, Tennessee and North Carolina, U.S.A. Indicators of soil N availability (total soil N concentrations, extractable NH{sub 4}-N, extractable NO{sub 3}-N, and C/N ratios) were measured in Oa and A horizons at 33 study plots. Dynamic measures included potential net soil N mineralization determined in 12-week aerobic laboratory incubations at 22 C. Potential net nitrification in the A horizon was correlated (r = + 0.83, P < 0.001) with total soil n concentrations. mostmeasures of soil n availability did not exhibit significanttrends with elevation, but there were topographic differences. Potential net soil N mineralization and net nitrification in the A horizon were higher in coves than on ridges. Relative amounts of particulate and organomineral soil organic matter influenced potential net N mineralization and nitrification in the A horizon. Calculations indicate that soil N availability and NO{sub 3}-N leaching in high-elevation spruce and fir forests of the Great Smoky Mountains National Park willmore » increase in response to regional warming.« less

Authors:
 [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
989642
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Water, Air, and Soil Pollution
Additional Journal Information:
Journal Volume: 120; Journal Issue: 3-4; Journal ID: ISSN 0049-6979
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AVAILABILITY; FIRS; FORESTS; LEACHING; MINERALIZATION; MOUNTAINS; NITRATES; NITRIFICATION; NITROGEN; NORTH CAROLINA; ORGANIC MATTER; PARTICULATES; SATURATION; SOILS; SPRUCES; TENNESSEE

Citation Formats

Garten Jr, Charles T. Nitrogen saturation and soil N availability in a high-elevation spruce and fir forest. United States: N. p., 2000. Web. doi:10.1023/A:1005270012802.
Garten Jr, Charles T. Nitrogen saturation and soil N availability in a high-elevation spruce and fir forest. United States. doi:10.1023/A:1005270012802.
Garten Jr, Charles T. Thu . "Nitrogen saturation and soil N availability in a high-elevation spruce and fir forest". United States. doi:10.1023/A:1005270012802.
@article{osti_989642,
title = {Nitrogen saturation and soil N availability in a high-elevation spruce and fir forest},
author = {Garten Jr, Charles T},
abstractNote = {A field study was conducted during the summer of 1995 to gain abetter understanding of the causes of nitrate (NO{sub 3}-N) leaching and ongoing changes in soil nitrogen (N) availability in high-elevation (1524-2000 m) spruce (Picea rubens) and fir (Abies fraseri) forests of the Great Smoky Mountains National Park, Tennessee and North Carolina, U.S.A. Indicators of soil N availability (total soil N concentrations, extractable NH{sub 4}-N, extractable NO{sub 3}-N, and C/N ratios) were measured in Oa and A horizons at 33 study plots. Dynamic measures included potential net soil N mineralization determined in 12-week aerobic laboratory incubations at 22 C. Potential net nitrification in the A horizon was correlated (r = + 0.83, P < 0.001) with total soil n concentrations. mostmeasures of soil n availability did not exhibit significanttrends with elevation, but there were topographic differences. Potential net soil N mineralization and net nitrification in the A horizon were higher in coves than on ridges. Relative amounts of particulate and organomineral soil organic matter influenced potential net N mineralization and nitrification in the A horizon. Calculations indicate that soil N availability and NO{sub 3}-N leaching in high-elevation spruce and fir forests of the Great Smoky Mountains National Park will increase in response to regional warming.},
doi = {10.1023/A:1005270012802},
journal = {Water, Air, and Soil Pollution},
issn = {0049-6979},
number = 3-4,
volume = 120,
place = {United States},
year = {2000},
month = {6}
}