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- EP51D-0647: Geologic Nitrogen Inputs to Semi-Arid Soils with and without Mammalian Bioturbation
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Board 0647‚ Hall EFG (Poster Hall)NOLA CC
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Rebecca Martinez, University of California, Santa Barbara (First Author, Presenting Author)
Riley Howard, University of California, Santa Barbara
Heath Goertzen, University of California, Davis
Nina Bingham, University of California, Santa Barbara
Iris Holzer, University of California, Santa Barbara
Nitrogen is a critical nutrient for plant productivity and ecosystem health, but not all sources of nitrogen are well understood. One such poorly understood source is nitrogen trapped in rocks, which can be released into soils and then used by plants and other organisms. This study examines nitrogen in rocks and its movement into soils in a climate from which we have limited data: semi-arid Mediterranean ecosystems. Some of these ecosystems include mammals that mix the soil, like gophers, which may play a role in moving nitrogen from rocks higher up in the soil. We measured nitrogen in rocks at two Central California sites, with and without these mammals, and found a wide range of nitrogen concentrations across different rock types. Additional soils data will allow for a more detailed assessment of the movement of nitrogen from rocks into soils across these two sites, helping us to better understand nutrient dynamics in these semi-arid ecosystems.
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