נגישות
menu      
Advanced Search
Syntax
Search...
Volcani treasures
About
Terms of use
Manage
Community:
אסיף מאגר המחקר החקלאי
Powered by ClearMash Solutions Ltd -
Microphytic crusts, shrub patches and water harvesting in the Negev Desert: The Shikim system
Year:
2002
Source of publication :
Landscape Ecology
Authors :
Zaady, Eli
;
.
Volume :
17
Co-Authors:
Eldridge, D.J., Dept. of Land and Water Conservation, Sch. of Biol., Earth/Environ. Sci., University of New South Wales, Sydney, NSW 2052, Australia
Zaady, E.
Shachak, M.
Facilitators :
From page:
587
To page:
597
(
Total pages:
11
)
Abstract:
Human-made contour banks are a central component of the Shikim water harvesting system in Israel's Negev Desert. Efficient water capture depends on the presence of a stable microphytic crust which directs surplus surface runoff into the banks where it is stored. We used simulated rainfall to examine the impact of soil surface disturbance on runoff and sediment transport, and the effect of this on the efficiency of resource capture within the Shikim system. Two disturbance regimes: 1) removal of the microphytic crust only, and 2) removal of the crust and shrub patches by cultivation, were compared with an undisturbed control. In the undisturbed state, 32% of rainfall was redistributed as runoff. This runoff penetrated approximately 27% deeper under the shrub patches compared with the microphytic crust. When the microphytic crust was destroyed by simulated trampling, the runoff coefficient declined to 13%, and there was no significant difference in water penetration between shrub and crust patches. Complete destruction of the shrub hummocks and crust by cultivation resulted in a decline in the runoff coefficient to 6%. The result of sustained disturbance in these patchy Negev shrublands is a breakdown in spatial heterogeneity, a loss of ecosystem function, a reduction in ecosystem goods and services such as plant diversity and production, and ultimately a reduction in pastoral productivity. These results reinforce the view that microphytic crusts are critical for the efficient operation of the Shikim water harvesting system. Given that practices such as cultivation and trampling which disturb microphytic crusts result in enhanced infiltration, crusts should be left intact to maximise the water harvesting efficiency in these desert landscapes.
Note:
Related Files :
Desert hydrology
Ecosystem services
hydrology
Israel
Landscape Ecology
runoff
sediment transport
Show More
Related Content
More details
DOI :
10.1023/A:1021575503284
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28721
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:41
You may also be interested in
Scientific Publication
Microphytic crusts, shrub patches and water harvesting in the Negev Desert: The Shikim system
17
Eldridge, D.J., Dept. of Land and Water Conservation, Sch. of Biol., Earth/Environ. Sci., University of New South Wales, Sydney, NSW 2052, Australia
Zaady, E.
Shachak, M.
Microphytic crusts, shrub patches and water harvesting in the Negev Desert: The Shikim system
Human-made contour banks are a central component of the Shikim water harvesting system in Israel's Negev Desert. Efficient water capture depends on the presence of a stable microphytic crust which directs surplus surface runoff into the banks where it is stored. We used simulated rainfall to examine the impact of soil surface disturbance on runoff and sediment transport, and the effect of this on the efficiency of resource capture within the Shikim system. Two disturbance regimes: 1) removal of the microphytic crust only, and 2) removal of the crust and shrub patches by cultivation, were compared with an undisturbed control. In the undisturbed state, 32% of rainfall was redistributed as runoff. This runoff penetrated approximately 27% deeper under the shrub patches compared with the microphytic crust. When the microphytic crust was destroyed by simulated trampling, the runoff coefficient declined to 13%, and there was no significant difference in water penetration between shrub and crust patches. Complete destruction of the shrub hummocks and crust by cultivation resulted in a decline in the runoff coefficient to 6%. The result of sustained disturbance in these patchy Negev shrublands is a breakdown in spatial heterogeneity, a loss of ecosystem function, a reduction in ecosystem goods and services such as plant diversity and production, and ultimately a reduction in pastoral productivity. These results reinforce the view that microphytic crusts are critical for the efficient operation of the Shikim water harvesting system. Given that practices such as cultivation and trampling which disturb microphytic crusts result in enhanced infiltration, crusts should be left intact to maximise the water harvesting efficiency in these desert landscapes.
Scientific Publication
You may also be interested in