Scaling Genes to Ecosystems
Well-constrained and controllable model systems serve as testbeds for linking genomic measures of microbial activity to trace gas exchange in the soil system. We use model systems to evaluate our understanding across scale and soil complexity.
Trace gas cycling at the Landscape Evolution Observatory. At the Landscape Evolution Observatory (LEO), we have the opportunity to measure trace gas cycling at unprecedented spatial and temporal resolution on three model hillslopes. The slopes are filled with crushed basalt, and we investigate what types of trace gas metabolisms support pioneering microbes and whether observed fluxes can be predicted from their sequence-based data.
Stable Isotope Labeling Experiment in the B2 Tropical Rainforest. Intermediate between a model system and a real world ecosystem, the Biosphere 2 Tropical Rainforest is an ideal site for evaluating our ability to scale soil microbial processes to the ecosystem while maintaining a level of control for replication in time and treatment. Here, we study the interactions between soil microbes and plants in driving greenhouse gas fluxes such as nitrous oxide and methane and investigate the implications of carbon cycling in the hottest rainforest in the world. This is an exciting year for research at the B2 Tropical Rainforest, as we bring together scientists from around the world to re-envision research in this iconic biome.
Soil exchange rates of COS and CO18O differ with the diversity of microbial communities and their carbonic anhydrase enzymes . Meredith, L.K., Ogée, J., Boye, K., Singer, E., Wingate, L., von Sperber, C., Sengupta, A., Whelan, M., Pang, E., Keiluweit, M., Brüggemann, N., Berry, J. A. & Welander, P.V. (2019): The ISME Journal 13: 290–300.
Reconciling Negative Soil CO2 Fluxes: Insights from a Large-Scale Experimental Hillslope . Cueva, A., Volkmann, T.H.M., van Haren, J., Troch, P.A., Meredith, L.K. (2019): Soil Systems 3(1): 10.
Controlled Experiments of Hillslope Coevolution at the Biosphere 2 Landscape Evolution Observatory: Toward Prediction of Coupled Hydrological, Biogeochemical, and Ecological Change . Volkmann Till H. M., Aditi Sengupta, Luke A. Pangle, Katerina Dontsova, Greg A. Barron-Gafford, Ciaran J. Harman, Guo-Yue Niu, Laura K. Meredith, Nate Abramson, Antonio A. Meira Neto, Yadi Wang, John R. Adams, David D. Breshears, Aaron Bugaj, Jon Chorover, Alejandro Cueva, Stephen B. DeLong, Matej Durcik, Ty P. A. Ferre, Edward A. Hunt, Travis E. Huxman, Minseok Kim, Raina M. Maier, Russell K. Monson, Jon D. Pelletier, Michael Pohlmann, Craig Rasmussen, Joaquin Ruiz, Scott R. Saleska, Marcel G. Schaap, Michael Sibayan, Markus Tuller, Joost L. M. van Haren, Xubin Zeng and Peter A. Troch (2018): in: Hydrology of Artificial and Controlled Experiments (eds. Jiu-Fu Liu and Wei-Zu Gu), IntechOpen, pp. 25-74.
Net Soil Exchange of CO2 and CO in a Mesocosm Experiment with Incipient Basaltic Tephra . Pappas, J., Cueva, A., Volkmann, T., Troch, P., van Haren, J.L.M., and Meredith, L.K. (2018): Abstract ED13E-0804 presented at 2018 AGU Fall Meeting, Washington, D.C., 10-14 Dec.
Experimental observation of a hillslope-scale rank StorAge Selection function: Process controls on its functional form, time variability, and hysteresis . Kim, M., Volkmann, T.H.M., Abramson, N., Bugaj, A., Hunt, E., Matos, K., Meira Neto, A.A., Sengupta, A., Wang, Y., Meredith, L.K., Dontsova, K., Harman, C.J., Chorover, J., and Troch, P.A. (2018): Abstract H13N-1958 presented at 2018 AGU Fall Meeting, Washington, D.C., 10-14 Dec.