Multifractal behaviour of the soil water content of a vineyard in northwest Spain during two growing seasons
Soil processes are characterized by a great degree of heterogeneity, which may be assessed by scaling properties. The aims of the current study were to describe the dynamics of soil water content at three depths in a vineyard under rain-fed and irrigation conditions and to assess the multifractality...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-08-01
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| Series: | Nonlinear Processes in Geophysics |
| Online Access: | http://www.nonlin-processes-geophys.net/23/205/2016/npg-23-205-2016.pdf |
| Summary: | Soil processes are characterized by a great degree of heterogeneity, which
may be assessed by scaling properties. The aims of the current study were to
describe the dynamics of soil water content at three depths in a vineyard
under rain-fed and irrigation conditions and to assess the multifractality
of these time data series. Frequency domain reflectometry (FDR) sensors were
used for automatically monitoring soil water content in a vineyard located
in Leiro (Ourense, northwest Spain). Data were registered at 30 min intervals at
three depths (20, 40, and 60 cm) between 14 June and 26 August 2011 and 2012.
Two treatments were considered: rain-fed and irrigation to
50 % crop evapotranspiration. Soil water content data series obeyed power
laws and tended to behave as multifractals. Values for entropy (<i>D</i><sub>1</sub>) and correlation (<i>D</i><sub>2</sub>) dimensions were lower in the series from the irrigation treatment. The Hölder exponent of order zero (<i>α</i><sub>0</sub>) was similar between treatments; however, the widths of the singularity spectra, <i>f</i>(<i>α</i>), were greater under irrigation conditions. Multifractality indices slightly decreased with depth. These results suggest that singularity and Rényi spectra were useful for characterizing the time variability of soil water content, distinguishing patterns among series registered under rain-fed and irrigation treatments. |
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| ISSN: | 1023-5809 1607-7946 |