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On the Possibilities of Averaging the Seasonal Pattern in Kjeldahl Nitrogen in a Group of Water Bodies
Author(s) -
Hrbáček J.
Publication year - 1974
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19740590307
Subject(s) - kjeldahl method , seasonality , log normal distribution , environmental science , nitrogen , standard deviation , mathematics , atmospheric sciences , hydrology (agriculture) , climatology , statistics , chemistry , geology , geotechnical engineering , organic chemistry
It is shown that the seasonal change of Kjeldahl nitrogen in several ponds and several years shows an average seasonal change which is statistically significant on a month‐to‐month basis although not apparent at first sight. The relative deviation of Kjeldahl nitrogen values in individual months and individual ponds from seasonal averages of individual ponds is closer to lognormal than to normal distribution. The seasonal curve based on average values of relative deviations in individual months and ponds from the seasonal averages of individual ponds shows the lowest variation of average monthly values and is therefore most adequate to a comparison of the seasonal pattern of two or more groups of water bodies.