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Eva Marie Levi School of Natural Resources and the Environment

Resolving Uncertainties in the Global Carbon Cycle: Woody Plant Encroachment, Decomposition and Soil Formation in Dryland Ecosystems. Eva Marie Levi School of Natural Resources and the Environment. Introduction – Why Do We Care?.

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Eva Marie Levi School of Natural Resources and the Environment

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  1. Resolving Uncertainties in the Global Carbon Cycle:Woody Plant Encroachment, Decomposition and Soil Formation in Dryland Ecosystems Eva Marie Levi School of Natural Resources and the Environment

  2. Introduction – Why Do We Care? • Desertification and woody plant encroachment is affecting drylands around the world • Implications of increasing shrub abundance: • Ecosystem and global C storage • Soil formation, fertility, and erosion • Water quality • Uncertainty remains in our understanding of processes that drive landscape evolution in drylands: • Organic matter decomposition • Soil formation 1904 Santa Rita Experimental Range http://soils.usda.gov 1997

  3. Methods OM Decomposition – Herbaceous and Woody Detritus Soil Aggregation Soil-Litter Transport and Mixing

  4. Results & Implications Soil Aggregation OM Decomposition • These results will: • Fill key knowledge gaps in literature • Improve our ability to model dryland ecosystem processes • Improve our ability to make large-scale assessments and predictions of changes in ecosystem function and services due to climate change

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