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Bedrock Vadose Zone Storage Dynamics Under Extreme Drought: Consequences for Plant Water Availability, Recharge, and Runoff
Water resources research, 2022-04, Vol.58 (4)
[Peer Reviewed Journal]
ISSN: 0043-1397 ;EISSN: 1944-7973
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Title:
Bedrock Vadose Zone Storage Dynamics Under Extreme Drought: Consequences for Plant Water Availability, Recharge, and Runoff
Author:
Hahm, W. J.
;
Dralle, D. N.
;
Sanders, M.
;
Bryk, A. B.
;
Fauria, K. E.
;
Huang, M. H.
;
Hudson‐Rasmussen, B.
;
Nelson, M. D.
;
Pedrazas, M. A.
;
Schmidt, L.
;
Whiting, J.
;
Dietrich, W. E.
;
Rempe, D. M.
Subjects:
ENVIRONMENTAL SCIENCES
Is Part Of:
Water resources research, 2022-04, Vol.58 (4)
Description:
Abstract Bedrock vadose zone water storage (i.e., rock moisture) dynamics are rarely observed but potentially key to understanding drought responses. Exploiting a borehole network at a Mediterranean blue oak savanna site—Rancho Venada—we document how water storage capacity in deeply weathered bedrock profiles regulates woody plant water availability and groundwater recharge. The site is in the Northern California Coast Range within steeply dipping turbidites. In a wet year (water year 2019; 647 mm of precipitation), rock moisture was quickly replenished to a characteristic storage capacity, recharging groundwater that emerged at springs to generate streamflow. In the subsequent rainless summer growing season, rock moisture was depleted by about 93 mm. In two drought years that followed (212 and 121 mm of precipitation) the total amount of rock moisture gained each winter was about 54 and 20 mm, respectively, and declines were documented exceeding these amounts, resulting in progressively lower rock moisture content. Oaks, which are rooted into bedrock, demonstrated signs of water stress in drought, including reduced transpiration rates and extremely low water potentials. In the 2020–2021 drought, precipitation did not exceed storage capacity, resulting in variable belowground water storage, increased plant water stress, and no recharge or runoff. Rock moisture deficits (rather than soil moisture deficits) explain these responses.
Publisher:
United States: American Geophysical Union (AGU)
Language:
English
Identifier:
ISSN: 0043-1397
EISSN: 1944-7973
Source:
Wiley Blackwell AGU Digital Archive
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