Space and time variability of quantitative and qualitative soil organic matter parameters on selected key monitoring localities of arable soils
2002
Barancikova, G. (Soil Science and Conservation Research Institute, Bratislava (Slovak Republic))
The presented paper on space and time variability of basic quantitative (organic carbon Corg) and qualitative parameters (ratio of humic and fulvic acids CHA/CFA, optical parameter Q46) of soil organic matter during monitoring period (1994-2000) on selected key localities of the Slovak Republic are represented arable soils of various soil types evaluated. Maximum space variability of organic carbon content was 10% of relative standard deviation. The highest heterogeneity of Corg values was observed on Calcaric Fluvisol contrary to Calcaro-haplic Chernozem where the lowest space variability was detected. During monitoring period on observed localities decrease of Corg was found. On all localities the lowest values of organic carbon in 1997 sampling were noticed. The changes of qualitative parameters were observed during monitoring period, too. On all localities increase of CHA/CFA ratio was found. The space variability of this parameter was quite high (3-32% of relative standard deviation) and the highest heterogeneity of CHA/CFA values in sampling 1997 was noticed. The changes in optical parameter Q46 was negligible however during monitoring period increase of this parameter mainly on Planosol and Fluvi-eutric Gleyosol was observed. Contrary to CHA/CFA parameter, variability of Q46 was considerable lower (1-7.7% of relative standard deviation). On the basis of these findings can be assumed that optical parameter Q46 is more suitable for soil organic matter evaluation contrary to CHA/CFA ratio
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