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Spatial variability and collector requirements for sampling throughfall volume and chemistry under a mixed-hardwood canopy

January 1, 1991

Ion concentrations were generally less variable within storms compared with net ion input data. Concentrations and net inputs of some ions were consistently less variable than others; for example, Ca2+, NO3-, and SO42- were less variable than NH4 + and K+. These patterns of variability were consistent in comparisons both within and among storms. The relatively low variability of NO3- and SO42- is probably due to dry deposition of these ions as anthropogenic pollutants, while the low variability of Ca2+ is the result of deposition in windblown soil particles. The high variability of NH4+ and K+ is probably the result of biological processes. Ammonium is strongly retained by the canopy, and K+ is readily leached from it. Retention by, and leaching from, the canopy can induce spatial variability as a result of spatial heterogeneity in the biota. Throughfall volume also displayed low variability within and among events, requiring an average of 11 collectors to estimate the mean within 10% at the 95% confidence level. -from Author

Publication Year 1991
Title Spatial variability and collector requirements for sampling throughfall volume and chemistry under a mixed-hardwood canopy
Authors L.J. Puckett
Publication Type Article
Publication Subtype Journal Article
Series Title Canadian Journal of Forest Research
Index ID 70016537
Record Source USGS Publications Warehouse