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    Author(s): Travis W. Idol; Phillip E. Pope; Felix, Jr. Ponder
    Date: 2002
    Source: Soil Science Society of America Journal 66(5):1662-1668
    Publication Series: Scientific Journal (JRNL)
    Station: North Central Research Station
    PDF: Download Publication  (1005.26 KB)


    Soil microorganisms mediate many of the major processes involved in soil N cycling. Also, they are strong competitors with plants for available soil N. Thus, changes in microbial N because of forest harvesting may have significant impacts on N availability and overall forest N cycling. A chronosequence of upland hardwood forest stands in southern Indiana, USA, ranging in age from 1 to 100 yr since last harvest, was chosen to evaluate changes in microbial N with stand development. Microbial N was measured in the A and B soil horizons during different seasons from 1997 to 1999. Peak levels of microbial N were highest in the youngest forest stand (1 to 3 yr old), but seasonal variability was greater than differences by stand age. Microbial N concentration (mg kg-1) varied significantly by season and soil horizon within stands ranging in age from 1 to 30 yr since harvest, but not in the mature, 80- to 100-yr-old stand. There were few significant differences in microbial N content (kg ha-1). Harvesting did not appear to have long-term effects on microbial N, but spatial variability in microbial N appeared to be greater in the younger forest stands.

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    Idol, Travis W.; Pope, Phillip E.; Ponder, Felix, Jr. 2002. Changes in Microbial Nitrogen Across a 100-Year Chronosequence of Upland Hardwood Forests. Soil Science Society of America Journal 66(5):1662-1668

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