Laboratory Policies

Lab Members

Alex Krichels, Postdoctoral Scholar

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Alex is interested in how ecosystem function is altered in response to global changes such as drought, rainfall intensification, and N deposition. His research uses stable isotope and molecular approaches to explore how N transformations in terrestrial ecosystems respond to these global changes.

Aral C. Greene, Ph.D. student

Aral graduated with a Bachelors of Science in Ecology and Evolution from UCSB. She has worked as a field technician in the Arctic and as an intern for the TRACE project in El Yunque National Forest in Puerto Rico. In addition to leading research projects on soil greenhouse gas emissions, she is also studying nutrient cycling in a rainfall manipulation experiment. Her research interests include soil biogeochemistry and nutrient cycling.

Elizah Stephens, Ph.D. Student

Elizah is studying how changes in nutrient cycling affect soil microbial communities and C and N biogeochemistry following disturbances such as fire. Elizah was awarded funding from  CalFire to pursue her research interests.

Johann Püspök, Ph.D. Student

Johann studied the influence of soil microbes on phosphorus cycling in regenerating tropical secondary forests during his M.S at Vienna. He is interested in how interactions between soil microbes, plants and the abiotic soil environment affect nutrient cycling in different terrestrial ecosystems.

Sharon Zhao, NSF REPS Fellow

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Sharon received her B.S. degree in microbiology from UCR. She joined our lab after being awarded NSF REPS funding to study how atmospheric N deposition may alter soil microbial processes and the emission of trace gases from soils.

Undergraduate students


Tony Calma, NSF REU








Yareli Olazabal

Past lab members


Jacob Velasquez (undergraduate research assistant 2021)






Karen Argumedo (undergraduate research assistant 2020) is pursuing an M.S. degree at Cal State L.A.





Nikki Shelton (undergraduate research assistant 2020) is now an undergraduate student at UCLA







Heather Haro (undergraduate research assistant 2020) is pursuing an M.S. degree at University of San Francisco




Kobe Luu (undergraduate research assistant 2018) is at Wichita Sate pursuing a graduate degree