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פותח על ידי קלירמאש פתרונות בע"מ -
Changes in the hydraulic properties of a clay soil under long-term irrigation with treated wastewater
Year:
2016
Source of publication :
Geoderma
Authors :
ברדהן, גופלי
;
.
גולדשטיין, דינה
;
.
לוי, גיא
;
.
רוסו, דוד
;
.
Volume :
264
Co-Authors:
Bardhan, G., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Russo, D., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Goldstein, D., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Levy, G.J., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Facilitators :
From page:
1
To page:
9
(
Total pages:
9
)
Abstract:
Treated wastewater (TWW) is an important water resource, especially in semiarid and arid regions. However, there are concerns that irrigation with TWW could lead to degradation of soil physical and hydraulic properties. The objective of our study was to determine the effects of long-term (≥ 15 years) 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). Similar bulk density, moisture content, cation exchange capacity, pH and exchangeable sodium percentage (ESP) levels were observed for the TWW irrigated samples and the control ones. However, irrigation with TWW caused a significant 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. The observed differences in the hydraulic properties between the TWW-irrigated samples and the control ones in this specific matric potential range, albeit the similarity in their ESP, suggest that long term irrigation with TWW affected structural porosity via narrowing macro- and mesopores (> 70 and 30-70 μm, respectively). It is further postulated that this adverse impact of irrigation with TWW on structural porosity might be associated with previously reported effects of TWW on the composition of the dissolved organic matter in the soil solution. © 2015 Elsevier B.V.
Note:
Related Files :
Forestry
irrigation
soil surveys
wastewater treatment
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.geoderma.2015.10.004
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
27689
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:33
You may also be interested in
Scientific Publication
Changes in the hydraulic properties of a clay soil under long-term irrigation with treated wastewater
264
Bardhan, G., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Russo, D., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Goldstein, D., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Levy, G.J., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
Changes in the hydraulic properties of a clay soil under long-term irrigation with treated wastewater
Treated wastewater (TWW) is an important water resource, especially in semiarid and arid regions. However, there are concerns that irrigation with TWW could lead to degradation of soil physical and hydraulic properties. The objective of our study was to determine the effects of long-term (≥ 15 years) 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). Similar bulk density, moisture content, cation exchange capacity, pH and exchangeable sodium percentage (ESP) levels were observed for the TWW irrigated samples and the control ones. However, irrigation with TWW caused a significant 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. The observed differences in the hydraulic properties between the TWW-irrigated samples and the control ones in this specific matric potential range, albeit the similarity in their ESP, suggest that long term irrigation with TWW affected structural porosity via narrowing macro- and mesopores (> 70 and 30-70 μm, respectively). It is further postulated that this adverse impact of irrigation with TWW on structural porosity might be associated with previously reported effects of TWW on the composition of the dissolved organic matter in the soil solution. © 2015 Elsevier B.V.
Scientific Publication
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