Arid
DOI10.1002/eco.1875
Ecohydrological role of biological soil crusts across a gradient in levels of development
Whitney, Kristen M.1; Vivoni, Enrique R.1,2; Duniway, Michael C.3; Bradford, John B.4; Reed, Sasha C.3; Belnap, Jayne3
通讯作者Whitney, Kristen M.
来源期刊ECOHYDROLOGY
ISSN1936-0584
EISSN1936-0592
出版年2017
卷号10期号:7
英文摘要

Though biological soil crusts (biocrusts) form abundant covers in arid and semiarid regions, their competing effects on soil hydrologic conditions are rarely accounted for in models. This study presents the modification of a soil water balance model to account for the presence of biocrusts at different levels of development (LODs) and their impact on one-dimensional hydrologic processes during warm and cold seasons. The model is developed, tested, and applied to study the hydrologic controls of biocrusts in the context of a long-term manipulative experiment equipped with meteorological and soil moisture measurements in a Colorado Plateau ecosystem near Moab, Utah. The climate manipulation treatments resulted in distinct biocrust communities, and model performance with respect to soil moisture was assessed in experimental plots with varying LOD as quantified through a field-based roughness index (RI). Model calibration and testing yielded excellent comparisons to observations and smooth variations of biocrust parameters with RI approximated through simple regressions. The model was then used to quantify how LOD affects soil infiltration, evapotranspiration, and run-off under calibrated conditions and in simulation experiments with gradual modifications in biocrust porosity and hydraulic conductivity. Simulation results show that highly developed biocrusts modulate soil moisture nonlinearly with LOD by altering soil infiltration and buffering against evapotranspiration losses, with small impacts on run-off. The nonlinear and threshold variations of the soil water balance in the presence of biocrusts of varying LOD helps explain conflicting outcomes of various field studies and sheds light on the ecohydrological role of biocrusts in arid and semiarid ecosystems.


英文关键词biocrust biological soil crust ecohydrology model Colorado Plateau manipulative experiment roughness index soil water balance South-western United States
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000412418300008
WOS关键词WATER-CONTROLLED ECOSYSTEMS ; WESTERN NEGEV DESERT ; HYDROLOGIC PROCESSES ; MOISTURE DYNAMICS ; COLORADO PLATEAU ; ACTIVE-ROLE ; STRESS ; ISRAEL ; MICROSTRUCTURE ; VEGETATION
WOS类目Ecology ; Environmental Sciences ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Water Resources
来源机构United States Geological Survey ; Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198402
作者单位1.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA;
2.Arizona State Univ, Sch Sustainable Engn & Built Environm, Tempe, AZ USA;
3.US Geol Survey, Southwest Biol Sci Ctr, Moab, UT USA;
4.US Geol Survey, Southwest Biol Sci Ctr, Flagstaff, AZ 86001 USA
推荐引用方式
GB/T 7714
Whitney, Kristen M.,Vivoni, Enrique R.,Duniway, Michael C.,et al. Ecohydrological role of biological soil crusts across a gradient in levels of development[J]. United States Geological Survey, Arizona State University,2017,10(7).
APA Whitney, Kristen M.,Vivoni, Enrique R.,Duniway, Michael C.,Bradford, John B.,Reed, Sasha C.,&Belnap, Jayne.(2017).Ecohydrological role of biological soil crusts across a gradient in levels of development.ECOHYDROLOGY,10(7).
MLA Whitney, Kristen M.,et al."Ecohydrological role of biological soil crusts across a gradient in levels of development".ECOHYDROLOGY 10.7(2017).
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