Haohua He

EPFL Valais Wallis
EPFL ENAC IIE MACE
Route des Ronquos 86
1951 Sion

EPFLETUEDOCEDCE

Expertise

Environmental Science
Soil Biogeochemistry
Microbiology hopefully :)

Mission

Biogeochemical mechanisms underlying soil–climate feedbacks

Current Work

Effects of freeze–thaw cycle perturbations on soil microbiome assembly, resilience, and function.
I first became fascinated by soil research during my Bachelor’s project, where I studied the degradation and toxicity of petroleum hydrocarbons, especially polycyclic aromatic hydrocarbons (PAHs) and alkanes, in soil ecosystems. During my Master’s project, I developed a lasting interest in soil organic carbon (SOC) dynamics and the biotic–abiotic mechanisms that regulate soil carbon  turnover from the biogeochemical perspective, with a particular focus on coupled carbon–iron cycling in the context of climate change.

Building on this foundation, I joined the MACE lab to pursue questions at the interface of microbiology and biogeochemistry. My PhD focuses on Alpine soils in montane settings, spanning sites with varied frozen conditions in winter. Under a warming climate, these systems are increasingly exposed to intensified freeze–thaw cycles (FTCs), which may alter soil carbon pools, reshape microbial communities, and shift metabolic functions, affecting greenhouse gas (GHG) fluxes such as CO₂, CH₄, and N₂O. My research aims to disentangle how changing FTC regimes affect microbial carbon and nitrogen cycling and associated GHG emissions, and to assess microbial resilience and adaptive responses under these environmental shifts.