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Titel |
Long-term irrigation with treated wastewater: effects on the hydraulic properties of a clay soil |
VerfasserIn |
Gopali Bardhan, David Russo, Guy Levy |
Konferenz |
EGU General Assembly 2017
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Medientyp |
Artikel
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Sprache |
en
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 19 (2017) |
Datensatznummer |
250147667
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Publikation (Nr.) |
EGU/EGU2017-11864.pdf |
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Zusammenfassung |
Treated wastewater (TWW) is an important water resource, especially in semiarid and arid
regions. However, there are some concerns that irrigation with TWW could lead to
degradation of soil physical and hydraulic properties. Our objective was to evaluate the
effects of long-term (≥15 y) irrigation with secondary TWW on some basic and hydraulic
soil properties of a clay soil. Undisturbed soil samples (cores) were taken to a depth of 4.5
m (in sections of 0.5 m) over a diagonal cross section of a five year old orchard
irrigated with TWW. Samples were taken from five sites within the tree rows (i.e.,
representing soil directly affected by TWW; referred to as “within rows”) and four sites
between the rows of trees (i.e., the control treatment representing soil that was not
directly subjected to the irrigation water; referred to as “between rows”). Soil analyses
included an array of basic properties, determination of a continuous particle size
distribution and measurement of the saturated hydraulic conductivity (HC). The
latter two were used for the computation of soil characteristic curve, Θ(ψ), and the
unsaturated HC curve, K(ψ). The results showed that irrigation with TWW had
insignificant effects on bulk density, moisture content, cation exchange capacity, pH and
exchangeable sodium percentage (ESP), but caused a reduction in the saturated HC, Ks.
The computed Θ(ψ) curve at a given soil depth, averaged over the different sites,
was similar for the TWW-irrigated samples and the control ones. On the contrary,
the computed K(ψ) curve at a given soil depth, averaged over the different sites,
for the TWW-irrigated samples were lower than those for the control samples at
matric potential > -100 cm (=pF< 2); similar K(ψ) values were noted at pF>2 for
the two treatments. Possible reasons for the observed differences in the hydraulic
properties between the TWW-irrigated samples and the control ones are discussed. |
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