Skip to Main Content
The impact of timber harvest on surface soil microbial community activity in clearcut Missouri Ozark Forest Ecosystem project plotsAuthor(s): Henry G., Jr. Spratt
Source: In: Shifley, S. R.; Kabrick, J. M., eds. Proceedings of the Second Missouri Ozark Forest Ecosystem Project Symposium: Post-treatment Results of the Landscape Experiment. Gen. Tech. Rep. NC-227. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 196-211.
Publication Series: Other
Station: North Central Research Station
PDF: Download Publication (550.22 KB)
DescriptionTransformations of carbon (C), sulfur (S), nitrogen (N), potassium (K), and magnesium (Mg) were determined for Oa+A- and EB-horizon soils collected from 12 permanent subplots located in MOFEP sites 1 and 3 from May 1995 to June 1999. Six of the subplots were clearcut in 1996, and six were left undisturbed. Mineralization of 14-C lignocellulose (of Quercus alba) was used as a measure of microbial catabolic activity in the soils. Quercus alba is the predominant overstory tree species on MOFEP plots. Incorporation of 35SO4 into organic sulfur compounds was used as a measure of microbial anabolic activity in the soils. Total C, N, and S (TC, TN, and TS) were determined by elemental analysis. Exchangeable K and Mg were determined using ammonium acetate extraction followed by atomic absorption spectrophotometry. After harvest, Oa+A-horizons from clearcut sites initially had higher rates of lignocellulose mineralization than controls, but these had declined by 2 years post-harvest. Organic S production rates were reduced to a large extent (by 80 to 90 percent, t-test, p<0.05) for soils from plots both high and low in the landscape. Concentrations of TC in Oa+A-horizons were lower in clearcut soils than controls on all dates beginning 1 year post-harvest (declining by as much as 35 percent compared with pre-treatment soils). Total S of both Oa+A-horizons decreased by nearly 40 percent after clearcutting, while EB-horizons tended to show an increase in TS following clearcutting (up nearly 73%). The TS content of litter falling into clearcut sites increased by nearly 50 percent 2 years post-harvest. Total N was lowest in clearcut plots. Exchangeable K concentrations in Oa+A-horizons from clearcut plots declined by nearly 75 percent 2 years post-harvest. Trends in exchangeable Mg concentrations in Oa+A-horizons were not easily determined for the clearcut plots 2 years post-harvest.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationSpratt, Henry G., Jr. 2002. The impact of timber harvest on surface soil microbial community activity in clearcut Missouri Ozark Forest Ecosystem project plots. In: Shifley, S. R.; Kabrick, J. M., eds. Proceedings of the Second Missouri Ozark Forest Ecosystem Project Symposium: Post-treatment Results of the Landscape Experiment. Gen. Tech. Rep. NC-227. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 196-211.
- Changes in forest floor and soil nutrients in a mixed oak forest 33 years after stem only and whole-tree harvest
- Foliar free polyamine and inorganic ion content in relation to soil and soil solution chemistry in two fertilized forest stands at the Harvard Forest, Massachusetts
- Aspects of Carbon and Sulfur Transformations in MOFEP Surface Soils
XML: View XML