Variability of soil water content controlled by evapotranspiration and groundwater–root zone interaction

Tomáš Orfánus, Dagmar Stojkovová, Viliam Nagy, T. Németh

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The central moments of soil water content (SWC) variability at the field scale are determined by soil texture, considering both smooth topography and groundwater table position. The characteristics of variability are governed by other soil factors like soil structure, micro relief, preferred water flow paths, root system characteristics, rock content, etc. This paper shows the integral effect of all these hardly quantifiable factors on SWC variability simulated by the processes of evapotranspiration and groundwater–root zone interaction using the HYDRUS ET model. SWC and soil hydraulic characteristics were spatially determined over a 4.5 ha field during two sampling campaigns under different atmospheric and groundwater conditions, and data distributions were compared to SWC distributions provided by mathematical modeling. The entire spring–summer period of 2003 was then examined for changes of SWC spatial variability. It was found that evapotranspiration influences SWC spatial variability only if SWC is under the critical value when wetter parts of the field evaporate more water than drier parts, resulting in smoothed SWC variability. Under wet conditions the spatial variability of SWC increases by drainage, as those parts of the soil with coarser texture drain faster than finer-textured parts.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalArchives of Agronomy and Soil Science
DOIs
Publication statusAccepted/In press - Mar 18 2016

Fingerprint

evapotranspiration
soil water content
soil water
water content
soil by texture
microrelief
soil
groundwater
soil structure
soil texture
root system
drain
water flow
water table
topography
root systems
drainage
fluid mechanics
mathematical models
texture

Keywords

  • drainage
  • Evapotranspiration
  • soil water content
  • spatial variability

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

Cite this

Variability of soil water content controlled by evapotranspiration and groundwater–root zone interaction. / Orfánus, Tomáš; Stojkovová, Dagmar; Nagy, Viliam; Németh, T.

In: Archives of Agronomy and Soil Science, 18.03.2016, p. 1-12.

Research output: Contribution to journalArticle

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