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Effects of Collection Interval on Quality of Throughfall Samples in Two Northern Hardwood Stands

School of Forestry and Wood Products, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931.

^* Corresponding author.

ABSTRACT

The chemical stability of weekly and biweekly throughfall collection intervals were compared at two northern hardwood stands in the Great Lakes region. Throughfall concentrations of Cl^–, NO^–₃, SO^2–₄, Ca²⁺, Mg²⁺, and K⁺ were not significantly (p 0.05) affected by the increased collection time, where as throughfall concentrations of NH⁺₄ and H⁺ collected biweekly were significantly different (p 0.05) than concentrations of these ions in weekly samples. The 1-wk increase in collection interval at one stand decreased concentrations of NH⁺₄ and increased concentrations of H⁺ 88 and 131%, respectively. The chemical instability of these ions appeared to be related to biological assimilation and/or nitrification of NH⁺₄. Stability of these ions decreased with increasing concentrations of inorganic N in the throughfall. These changes in concentrations of NH⁺₄ and H⁺ may introduce sampling bias when estimating throughfall fluxes or concentrations of these ions from biweekly collections. The decreased stability of these ions with increased concentrations of inorganic N should be an important consideration when selecting sampling intervals for stands that receive differing deposition levels of atmospheric N or have different canopy retention rates of N.

This study was supported by funds provided by the Quality Assurance Coop. and the Eastern Hardwood Res. Coop. within the joint USEPA/USDA-FS Forest Response Program. This paper has not been subject to USEPA, USDA-FS peer review and should not be construed to represent the policies of these agencies.

Received for publication March 13, 1990.

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