Water flux and stable water isotope data from a warm semiarid shrubland
|Authors:||Daphne Szutu Shirley Anne Papuga|
|Owners:||Shirley Anne Papuga Daphne Szutu|
|Resource type:||Composite Resource|
|Storage:||The size of this resource is 76.7 KB|
|Created:||May 10, 2019 at 8:23 a.m.|
|Last updated:||May 10, 2019 at 6:08 p.m. by Daphne Szutu|
|Citation:||See how to cite this resource|
Ecohydrological processes in semiarid shrublands and other dryland ecosystems are sensitive to discrete pulses of precipitation. Anticipated changes in the frequency and magnitude of precipitation events are expected to impact the spatial and temporal distribution of soil moisture in these drylands, thereby impacting their ecohydrological processes. Recent field studies have shown that in dryland ecosystems, transpiration dynamics and plant productivity are largely a function of deep soil moisture available after large precipitation events, regardless of where the majority of plant roots occur. However, the strength of this relationship and how and why it varies throughout the year remains unclear. We present eddy covariance, soil moisture, and sap flow measurements taken over an 18-month period in conjunction with an analysis of biweekly precipitation, shallow soil, deep soil, and stem stable water isotope samples from a creosotebush-dominated shrubland ecosystem at the Santa Rita Experimental Range in southern Arizona. Within the context of a hydrologically defined two-layer conceptual framework, our results support that transpiration is associated with the availability of deep soil moisture and that the source of this moisture varies seasonally. Therefore, changes in precipitation pulses that alter the timing and magnitude of the availability of deep soil moisture are expected to have major consequences for dryland ecosystems. Our findings offer insights that can improve the representation of drylands within regional and global models of land surface atmosphere exchange and their linkages to the hydrologic cycle.
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This resource was created using funding from the following sources:
|Agency Name||Award Title||Award Number|
|National Science Foundation||CAREER Award||EAR-1255013|
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