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EESA Research Shines Light on Role Soil Microbes Play in Carbon Sequestration4 min read

by Christina Procopiou on October 9, 2017

Climate and Ecosystem Sciences Division Climate Modeling Program Climate Sciences Department Publication Research Highlight

Ecologist Rose Abramoff, postdoctoral fellow in EESA’s Climate Sciences Department, and her colleagues at Boston University and the University of Maryland used data collected from the Harvard Forest Environmental Measurement to develop a new mathematical model for predicting how soils react to various temperatures, degrees of moisture, and plant inputs. Here, Abramoff and research assistant Samuel Knapp monitored root growth using a root viewing chamber installed within the soil at the Central Massachusetts research site for a related research study conducted in 2012.

Microbes in soil respond differently to plants that are rich in carbon than to those rich in nitrogen, according to new research by postdoctoral fellow Rose Abramoff of Berkeley Lab’s Earth and Environmental Sciences Area and colleagues at the University of Maryland and Boston University. Abramoff is an ecologist working in the Climate Sciences Department within EESA’s Climate and Ecosystem Sciences Division.

The researchers developed a new mathematical model for predicting how soils react to various temperatures and to different types and amounts of moisture and plant inputs. After testing the model against a dataset of carbon dioxide release from soils, the team conducted a theoretical experiment observing how soils respond differently to plants rich in carbon versus those rich in nitrogen. Results of their study are published in the Journal of Geophysical Research: Biogeosciences.

For the study, automated soil respiration measurement chambers installed at ground level closed over the soil surface for about five minutes every half hour to detect the concentration of carbon dioxide being released from the soil at the test site.

In looking for potential ways to mitigate climate effects, some scientists are exploring how various soil inputs might increase soil’s ability to sequester carbon. Mathematical models used in making climate predictions evaluate the carbon content of soils to determine the amount released into the atmosphere as carbon dioxide. These models generally overlook the major impact microorganisms that grow in the soil, like bacteria and fungi, have on how much carbon remains in the soil and how much is released as carbon dioxide.

The new model Abramoff and colleagues developed reproduces the changing relationship between temperature and microbial respiration during the growing season to predict the rate of carbon and nitrogen cycling in the soil. Abramoff believes the new soil decomposition model could be incorporated into larger-scale models of carbon and nitrogen cycling – and effectively advance what climate predictions scientists are able to make with relation to microbial activity in soil.

“I think this model is one small step in helping scientists make better-informed predictions of the effect of climate on soils and ecosystems,” Abramoff says. “The model makes it possible to simulate the major environmental impacts to which soil might be subject: changes in temperature, changes in soil moisture, and changes that affect nitrogen inputs like fertilization or land use change.”

The new soil decomposition model was created from two simpler models. One predicts carbon dioxide release based on the amount of decomposing plant matter in relation to temperature and water content of soil. The other model also predicts carbon dioxide release from the soil, but focuses more on tracking soil carbon gains and losses by simulating decomposition of soil by microbes.

In testing the new model which combines the two, the researchers simulated how microbes would respond to soil inputs with different nitrogen content and composition. They fed the microbes two types of plants to observe the effect of priming in response to carbon-rich plants versus those rich in the nitrogen microbes need. The researchers observed that the plants with higher nitrogen content caused microbes to decompose more soil.

These observations indicate that it’s possible to inhibit soil decomposition by adding high-carbon, low-nitrogen inputs. The new soil decomposition model could also be used to test other theories about microbial activity.

Abramoff is optimistic about the potential for this model to help change the way scientists view soil microbial activity in relation to climate effects. “By taking into consideration the role of microbes in carbon dioxide release and the role of nitrogen in soil decomposition, we think this model provides a more complete picture of the various factors at play in carbon sequestration.”

 

News & Events

EGD Postdoc Fellow Receives Young Researcher Presenter Award1 min read

January 21, 2021

Pramod Bhuvankar, an EGD postdoctoral fellow working with research scientist Abdullah Cihan, received a Young Researcher Presenter Award during the 2020 Computational Methods in Water Resources conference in December. His presentation, “Pore-scale simulations of permeability decline in porous media due to fines migration,” described a pore-scale CFD study of clay mobilization in porous media due…

Berkeley Lab Partners with International Collaborators in Geothermal Energy Research1 min read

January 20, 2021

  Scientists from the Energy Geosciences Division have begun working with European partners on three new geothermal research projects through the Department of Energy’s membership in GEOTHERMICA, a transnational consortium that combines the in-country financial resources and research expertise of 15 participating countries to demonstrate and validate novel concepts in geothermal energy use. This marks the…

EESA Senior Scientist Talks Earthquake Building Resilience1 min read

Berkeley Lab senior scientist David McCallen leads a subproject called Earthquake Sim, or EQSIM, for the DOE’s Energy Exascale Computing Project. He is also professor and director of the Center for Civil Engineering Earthquake Research in the Department of Civil and Environmental Engineering at the University of Nevada, Reno. McCallen recently spoke with Scott Gibson of…

EESA Scientist Coauthors New Comprehensive Guide on Removing CO2 from the Atmosphere2 min read

January 18, 2021

Berkeley Lab researchers are working on ways to sequester more carbon in soil, including through agricultural practices. (Credit: Berkeley Lab) Scientists say that any serious plan to address climate change should include carbon dioxide removal (CDR) technologies and policies, which makes the newly launched CDR Primer an especially vital resource, says Berkeley Lab scientist Margaret Torn, one…

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