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| Titel |
Joint Multifractal Analysis of penetration resistance variability in an
olive orchard. |
| VerfasserIn |
Juan Lopez-Herrera, Tomas Herrero-Tejedor, Antonio Saá-Requejo, Maria Villeta, Ana M. Tarquis |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250136205
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| Publikation (Nr.) |
 EGU/EGU2016-17191.pdf |
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| Zusammenfassung |
| Spatial variability of soil properties is relevant for identifying those zones with physical
degradation. We used descriptive statistics and multifractal analysis for characterizing the
spatial patterns of soil penetrometer resistance (PR) distributions and compare them at
different soil depths and soil water content to investigate the tillage effect in soil
compactation. The study was conducted on an Inceptisol dedicated to olive orchard for the
last 70 years. Two parallel transects of 64 m were selected as different soil management plots,
conventional tillage (CT) and no tillage (NT). Penetrometer resistance readings were carried
out at 50 cm intervals within the first 20 cm of soil depth (López de Herrera et al.,
2015a).
Two way ANOVA highlighted that tillage system, soil depth and their interaction
are statistically significant to explain the variance of PR data. The comparison of
CT and NT results at different depths showed that there are significant differences
deeper than 10 cm but not in the first two soil layers. The scaling properties of each
PR profile was characterized by τ(q) function, calculated in the range of moment
orders (q) between -5 and +5 taken at 0.5 lag increments. Several parameters were
calculated from this to establish different comparisons (López de Herrera et al.,
2015b).
While the multifractal analysis characterizes the distribution of a single variable along its
spatial support, the joint multifractal analysis can be used to characterize the joint distribution
of two or more variables along a common spatial support (Kravchenko et al., 2000; Zeleke
and Si, 2004). This type of analysis was performed to study the scaling properties of the joint
distribution of PR at different depths. The results showed that this type of analysis added
valuable information to describe the spatial arrangement of depth-dependent penetrometer
data sets in all the soil layers.
References
Kravchenko AN, Bullock DG, Boast CW (2000) Joint multifractal analysis of crop yield
and terrain slope. Agro. j. 92: 1279–1290.
López de Herrera, J., Tomas Herrero Tejedor, Antonio Saa-Requejo and Ana M. Tarquis
(2015a) Influence of tillage in soil penetration resistance variability in an olive orchard.
Geophysical Research Abstracts, 17, EGU2015-15425.
López de Herrera, J., Tomás Herrero Tejedor, Antonio Saa-Requejo, A.M. Tarquis.
Influence of tillage in soil penetration resistance variability in an olive orchard. Soil Research,
accepted, 2015b. doi: SR15046
Zeleke TB, Si BC (2004) Scaling properties of topographic indices and crop yield:
Multifractal and joint multifractal approaches. Agro. j. 96: 1082–1090. |
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