Control-Bag Correction for Forest Floor Litterbag Contamination
- Travis W. Idol *a,
- Kristen A. Holzbaurb,
- Phillip E. Popec and
- Felix Ponderd
- a Dep. of Land, Air, and Water Resources, Univ. of California-Davis, Hoagland Hall, One Shields Ave., Davis, CA 95616
b Texas Dep. of Agriculture, Regulatory Division, P.O. Box 12847, Austin, TX 78711
c Dep. of Forestry and Natural Resources, Purdue Univ., 1159 Forestry Bldg., West Lafayette, IN 47907
d USDA Forest Service, North Central Research Station, 208 Foster Hall, Chestnut St., Lincoln University, Jefferson City, MO 65102-0029
Although contamination of litterbags by organic matter is potentially important, there are no standard methods to correct for it. Organic and mineral contamination of field-incubated forest floor litterbags was investigated using the standard ash-free dry mass (AFDM) correction and a correction based on increases in the mass of field-incubated litterbags filled with undecomposable control material. After 120 d, mineral contamination of Oi horizon litter averaged 5.2% of initial litter mass in stands ranging from 7 to 100 yr since cutting. There were no consistent changes in mineral contamination of Oe horizon litter. The mass of nylon control material increased by an average of 22% of initial litter mass after 120 d. Decomposition rates of Oi and Oe litter corrected using increases in control bag mass were significantly higher than uncorrected or AFDM-corrected rates. Forest stand age did not significantly affect mineral contamination, but mass gain after 120 d in the control bags was significantly higher in the 7-yr-old stand (32%) than in 13-, 32-, or 80- to 100-yr-old stands (17–20%).Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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