College of Science "Science Salon" Lecture: Dr. Ma Minna on Nitrogen Cycling Models in Land–River Ecosystems

Lecture Details

Title: Research on Nitrogen Cycling Process Models in Land–River Ecosystems

Speaker: Dr. Ma Minna

Time: May 27, 2026 (Wednesday), 3:30 PM

Venue: Conference Room C302 (Tencent Meeting: 598-141-792)

This lecture is jointly organized under the College of Science “Science Salon” series, the Guangdong Key Laboratory of Marine Biotechnology lecture series, and the Marine Science Long-Term Program lecture series.

About the Speaker

Ma Minna is a postdoctoral researcher at the Université libre de Bruxelles (ULB, French-speaking community). She received her PhD in Science from Sun Yat-sen University in December 2021 and began her postdoctoral research at ULB in Belgium in March 2022. Her work focuses on carbon and nitrogen cycling in land–river ecosystems under global change, with emphasis on nitrogen lateral transport from land to river to ocean driven by soil erosion and leaching, as well as the development, improvement, and evaluation of river and soil N2O process models. She also studies gross primary production (GPP) models for terrestrial ecosystems. She has participated in the EU Horizon 2020 “ESM-2025” project and a China-Belgium intergovernmental cooperation project on river N2O emission modeling. Her papers have appeared in Earth System Dynamics and Journal of Advances in Modeling Earth Systems.

Abstract

Based on the land surface model ORCHIDEE, the speaker developed ORCHIDEE3-Nlat to simulate nitrogen lateral transport from terrestrial ecosystems to rivers, as well as nitrogen transport and transformation in river networks, fluxes to the ocean, and river N2O emissions. The model was evaluated using discharge observations from the Global Runoff Data Centre (GRDC) and nitrogen concentration observations from the Global River Water Quality Archive (GRQA). On this basis, global simulations for 1901–2020 were conducted to characterize the spatiotemporal patterns of lateral nitrogen transport and river N2O.

Factor experiments were further used to quantify the contributions of atmospheric nitrogen deposition, fertilizer use, organic fertilizer use, rising atmospheric CO2 concentrations, land-use change, and climate change to nitrogen fluxes and river N2O emissions in different periods, offering a systematic summary of the global land–river nitrogen cycle and its budget in the early 20th and early 21st centuries.

Faculty and students are warmly welcome to attend.

Source: Ocean and Life Sciences, Guangdong Key Laboratory of Marine Biotechnology, May 26, 2026

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