You are here: NRS Home / Publications & Data / Changes in Microbial Nitrogen Across a 100-Year Chronosequence of Upland Hardwood Forests

Publication Details

Publication Toolbox
  • Download PDF  (1005 KB)
  • This publication is available only online.

Changes in Microbial Nitrogen Across a 100-Year Chronosequence of Upland Hardwood Forests

Year Published

2002

Source

Soil Science Society of America Journal 66(5):1662-1668

Abstract

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.

Citation

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
Last updated on: August 11, 2006

NRS at a Glance