<div dir="ltr"><p class="MsoNormal"><b>PhD Position Investigating the Interface
between Roots, Regolith, Rocks, and,Climate—the R3-C Frontier -
UC Riverside</b><br>
</p>
<p class="MsoNormal">A PhD graduate student assistantship is
available in the
Department of Environmental Sciences at the University of
California, Riverside
starting Summer or Fall 2022. We are looking for an independent
and
highly-motivated graduate student to join a National Science
Foundation-funded
collaborative project studying four key knowledge gaps at the
interface between
roots, regolith, rocks, and climate (aka the R3-C frontier):</p>
<p class="MsoNormal">(1) In what ways do bedrock properties interact
with
overlying regolith to influence the development of the soil pore
networks and
soil hydraulic properties that control water flow?</p>
<p class="MsoNormal">(2) How does the spatial distribution of
mineral weathering,
influenced by the development of pore networks from
bedrock-regolith
interactions, control the manner in which roots acquire water and
nutrients?</p>
<p class="MsoNormal">(3) How do critical zone thickness and root
water uptake
dynamics interact to regulate evapotranspiration dynamics under
changing water
supply and demand conditions?</p>
<p class="MsoNormal">(4) Do roots modify soil structure by imposing
depth-dependent wet-dry cycles that mediate aggregate-size
distributions, and
thus the ability of the regolith to preserve organic carbon?</p>
<p class="MsoNormal">As part of this project, the student will
assess the role of
bedrock on the development of macropores, preferential flow paths,
and soil
structure at a long-term manipulation experiment at the Konza
Prairie
Biological Station (KPBS), examine the effects of interactions
between roots,
soil, and bedrock on the evolution of soil hydraulic properties,
distribution
of soil chemical and physical properties, and hydrologic
functioning of the
critical zone. The successful candidate will gain experience
analyzing soil
moisture data collected from field sensors and conducting field
work at the
four project sites (Coal Creek, CO, KPBS, Reynolds Creek CZO, and
Southern
Sierra CZO), quantitatively characterize fine-scale distribution
of soil
properties and morphology using digital soil morphometrics and
proximal-sensing
tools such as multistripe laser triangulation scanning and VisNIR
hyperspectral
imaging, and develop methods for upscaling results to spatial
resolutions
appropriate for inclusion in regional and global land surface
models.</p>
<p class="MsoNormal">Ideal candidates will have a bachelors and
masters degree in
soil science, hydrology, environmental science, geology, ecology,
or
closely-related discipline, and a strong interest in pedology,
soil physics,
and hydrology. Because this project utilizes data analyses,
statistical
modeling, and numerical methods, a demonstrated aptitude for
quantitative
analysis and programming skills in languages such as R, Python, or
MATLAB are
considered essential. Experience running hydrological models is a
plus as is
experience with soil judging. Candidates without a masters degree
will also be
considered. </p>
<p class="MsoNormal">If you are interested in applying for this
graduate student
position please email a resume/CV, unofficial transcripts from
your bachelors
and masters institutions (if applicable), and a brief summary of
your research
interests and long-term goals to Drs. Daniel Hirmas
(<a class="gmail-moz-txt-link-abbreviated" href="mailto:daniel.hirmas@ucr.edu">daniel.hirmas@ucr.edu</a>) and
Hoori Ajami (<a class="gmail-moz-txt-link-abbreviated" href="mailto:hooria@ucr.edu">hooria@ucr.edu</a>) with the phrase <b>R3-C GSR</b> in
the subject
line. For international students, please provide either TOEFL (iBT
or iBT
Special at Home version), IELTS, or IELTS Indicator exam scores. </p>
<p class="MsoNormal">If you are attending the 2021 ASA-CSSA-SSSA
Annual Meetings
in Salt Lake City and are interested in this position, please
email Daniel
Hirmas to set up a a time to meet in person. If you are attending
the 2021 AGU
Fall Meeting in New Orleans and are interested in this position,
both Daniel
Hirmas and Hoori Ajami are available to meet in person; please
email to set up
a meeting.</p></div>