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| Titel |
Joint multifractal analysis of soil general properties measured along a transect |
| VerfasserIn |
Eva Vidal Vazquez, Sidney R. Vieira, José G. V. Miranda, Otavio A. Camargo, João R. F. Menk, Jorge Paz-Ferreiro |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052234
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| Zusammenfassung |
| This work is an extension of a previous multifractal analysis of the spatial variability on basic
soil properties. Seventy-nine soil samples were collected on a 2370 m long plot at 30 m
intervals in Campinas, SP, Brazil. Site, sampling strategy, climate and soil type have been
described before (Vidal Vázquez et al., 2010). In this previous work we reported that general
physico-chemical soil properties (sand, silt and clay content, pH, organic matter content,
exchangeable bases, exchangeable aluminium + hydrogen and cation exchange capacity) had
a multiple scale behaviour that was characterized by multifractal functions. There
is little information on multiple scale relationships between two interacting and
multifractally distributed soil properties, and to our knowledge this research topic had not
been before carried out in tropical soils. The objective of this study was to analyze
the scale dependence between pairs of basic soil properties by joint multifractal
analysis. The moment method was employed to obtain the partition function, the
local scaling indices, α(q,t) and β(q,t), for each pair of variables and the spectra of
the joint dimensions, f(α,β), for the corresponding joint distributions. This allows
assessment of the strength of the association between the scaling indices of two
variables. We showed that relationships between some of the study soil properties
were a function of the observation scale. Advantages of multiple scale analysis
upon single scale analysis using multifractal and joint multifractal analysis were
discussed based on the relationship between the spatial distribution of soil texture
parameters (sand and clay) and basic chemical properties. It was concluded that multiple
scale analysis significantly improved characterization of spatial variability in soil
properties.
Acknowledgements: This work was supported by Spanish Ministry of Education (MEC)
and governmental agency CAPES from Brazil (Project PHB2009-0094-PC).
References
Vidal Vázquez, E., Vieira, S.R., Miranda, J.G.V., Camargo, O.A., Menk, J.R.F. and
Paz-Ferreiro, J. 2010. Heterogeneity of soil properties along a profile as reflected in
multifractal analysis. Geophysical Research Abstract, Vol. 12, EGU 2010-8334. |
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