Ph.D. in Evolution, Ecology, & Organismal Biology, University of California – Riverside (2021)

M.S. in Ecology & Evolutionary Biology, University of Michigan (2015)

B.S. in Botany, Miami University (2013)

B.S. in Environmental Science, Miami University (2013)

2025-present: Assistant Professor, School of Plant, Environmental, and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, USA

2023-2025: Postdoctoral Research Associate, School of Geography, Development and Environment, University of Arizona, Tucson, AZ, USA

2021-2023: NSF Postdoctoral Research Fellow, School of Natural Resources & Environment, University of Arizona, Tucson, AZ, USA

• Soil microbial ecology and biochemistry
• Soil and rhizosphere carbon and nitrogen metabolism
• Water-carbon-nitrogen interactions
• Food-water-energy nexus

Postdoctoral Research Fellowship, BIO5 Institute, University of Arizona (2023)

Postdoctoral Research Fellowship in Biology, National Science Foundation (2021-2023)

Fellowship in Extremely Large Data Sets, National Aeronautics and Space Administration and University of California – Riverside (2017-2019)

East Asia and Pacific Summer Institute Fellowship, National Science Foundation (2017)

Greater Research Opportunities Fellowship, U.S. Environmental Protection Agency (2011-2013)

Andrews, H.M. and Jenerette, G.D. (2025). Differential pulse sensitivity of nitric and nitrous oxide emissions to temperature, carbon, and nitrogen following wetting of desert soils. Journal of Geophysical Research: Biogeosciences, 130, e2025JG009169. https://doi.org/10.1029/2025JG009169

Seay-Fleming, C., Swanson, T., Gerlak, A. K., Pavao-Zuckerman, M. A., Andrews, H.,Moore, K., & Barron-Gafford, G. A. (2025). Cultivating engagement: Public participation in agrivoltaics planning and design. Energy Research & Social Science, 127(104273), 104273. https://doi.org/10.1016/j.erss.2025.104273.

Krichels, A.H., Jenerette, G.D., Shulman, H., Piper, S., Greene, A.C., Andrews, H.M., Botthoff, J., Sickman, J.O., Aronson, E.L., Homyak, P.M. (2024). Bacterial denitrification drives elevated N₂O emissions in arid southern California drylands. Science Advances, 9(49), eadj1989. https://doi.org/10.1126/sciadv.adj1989.

Krichels, A.H., Homyak, P.M., Aronson, E.L., Sickman, J.O., Botthoff, J., Greene, A.C., Andrews, H.M., Shulman, H., Piper, S., Jenerette, G.D. (2023). Soil NH₃ emissions across an aridity, soil pH, and N deposition gradient in southern California. Elementa: Science of the Anthropocene, 11:1. https://doi.org/10.1525/elementa.2022.00123.

Andrews, H.M., Krichels, A.H., Homyak, P.M., Piper, S., Aronson, E.L., Botthoff, J., Greene, A.C., & Jenerette, G.D. (2023). Wetting-induced soil CO₂ emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert. Global Change Biology, 29, 3205-3220. https://doi.org/10.1111/gcb.16669.

Andrews, H.M., Homyak, P.M., Oikawa, P.Y., Wang, J., Jenerette, G.D. (2022). Water-conscious management strategies reduce per-yield irrigation and soil emissions of CO₂, N₂O, and NO in high-temperature forage cropping systems. Agriculture, Ecosystems & Environment 332, 107944. https://doi.org/10.1016/j.agee.2022.107944.

Krichels, A., Homyak, P.M., Aronson, E.L., Sickman, J.O., Botthoff, J., Shulman, H., Piper, S., Andrews, H.M., Jenerette, G.D. (2022). Rapid nitrate reduction produces pulsed NO and N₂O emissions following wetting of dryland soils. Biogeochemistry. https://doi.org/10.1007/s10533-022-00896-x.

Andrews, H.M. and Jenerette, G.D. (2020). Exotic grass litter modulates seasonal pulse dynamics of CO₂ and N₂O, but not NO, in Mediterranean-type coastal sage scrub at the wildland-urban interface. Plant and Soil 456(1): 339–353. https://doi.org/10.1007/s11104-020-04722-x.

Griebel, A., Metzen, D., Boer, M.M., Barton, C.C., Renchon, A.A., Andrews, H.M., Pendall, E. (2020). Using a paired tower approach and remote sensing to assess carbon sequestration and energy distribution in a heterogeneous sclerophyll forest. Science of the Total Environment 690, 133918. https://doi.org/10.1016/j.scitotenv.2019.133918.

Pedroncelli, L., Carter-House, D., Ginnan, N., Andrews, H., Drozd, C., DiSalvo, B. (2019). The consequences of drought on plant pathology. Journal of Science Policy & Governance 15(1).

Jenerette, G.D., Park, I.W., Andrews, H.M., Eberwein, J.R. (2018). Biogeochemical cycling of carbon and nitrogen in chaparral dominated ecosystems. In: Underwood, E., Safford, H., Molinari, N., Keeley, J. (eds.) Valuing Chaparral. Springer Series on Environmental Management. Springer, Cham. https://doi.org/10.1007/978-3-319-68303-4_6.

Watson, E.B., Wigand, C., Davey, E.W., Andrews, H.M., Bishop, J., Raposa, K.B. (2017). Wetland loss patterns and inundation-productivity relations prognosticate widespread salt marsh loss for southern New England. Estuaries and Coasts 40(3): 662-681. https://doi.org/10.1007/s12237-016-0069-1.

Watson, E.B., Andrews, H.M., Fischer, A., Cencer, M., Coiro, L., Kelley, S., Wigand, C. (2015). Growth and photosynthesis responses of two co-occurring marsh grasses to inundation and varied nutrients. Botany 93(10): 671-683. https://doi.org/10.1139/cjb-2015-0055.

Watson, E.B., Oczkowski, A.J., Wigand, C., Hanson, A.R., Davey, E.W., Crosby, S.C., Johnson, R.L., Andrews, H.M. (2014). Nutrient enrichment and precipitation changes do not enhance resiliency of salt marshes to sea level rise in the Northeastern U.S. Climatic Change 125: 501-509. https://doi.org/10.1007/s10584-014-1189-x.

AGRO 3040 / EMS 3045: Soil Conservation (2 credit hours, fall semesters)

This course explores soil conservation concepts and approaches, with emphasis on agroecosystems. Topics include causes, effects, and measurement techniques of: soil erosion and sedimentation; soil and environmental pollution; plant-soil-water interactions; soil ecology; and soil health indicators. Lectures and activities incorporate materials from USDA Natural Resources Conservation Service’s “Fundamentals of Conservation and Sustainability in Agriculture” certification course, and students are encouraged to complete certification in tandem with course credit.

AGRO 4056 / BIOL 4256: Microbial Ecology and Nutrient Cycling in Soils (4 credit hours, spring semesters)

This course investigates the diversity and functions of soil microorganisms and their influences on terrestrial nutrient cycling. Lecture and lab components will explore themes such as biological nitrogen fixation, plant nutrient availability, decomposition of organic and inorganic materials, and impacts of microbial processes on environmental quality, as well as methodologies used to examine these processes.

• Soil Microbial Ecology and Function Lab website

• Soil Microbial Ecology and Function Github

• Holly M. Andrews Google Scholar profile

Characterizing soil health and yield under conservation practices in soybean and grain production systems (PI)

Chicken litter application as a tool to increase yield and soil fertility in Louisiana soybean fields (Co-PI)