Sample size requirements for estimation of throughfall chemistry beneath a mixed hardwood forest

K. M. Kostelnik, J. A. Lynch, J. W. Grimm, E. S. Corbett

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Abstract

Six rainfall events were intensively sampled below a mixed hard-wood forest canopy in central Pennsylvania to determine sample size requirements for estimation of throughfall volumes and ionic concentrations. Evaluation of the ionic parameters of throughfall revealed that the concentrations of most major ions were nonnormally distributed. Differences in the distributions of concentrations were found to occur between ions as well as between storms. Significant departures from normality were mainly due to right-skewness. Only H+ exhibited a left skewed sample distribution. None of the basic transformations were effective in normalizing all parameters. A high degree of spatial variability was observed for each of the chemical parameters. Nitrate and hydrogen ions (NO3 - and H+), were found to be the least variable, whereas vegetatively mobile ions such as K+ and Mg2+ exhibited the greatest variability. -from Authors

Original languageEnglish (US)
Pages (from-to)274-280
Number of pages7
JournalJournal of Environmental Quality
Volume18
Issue number3
DOIs
StatePublished - Jan 1 1989

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

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