77049 Impacts of Land Use Change On Ecosystem Carbon in Subtropical Grassland Ecosystems.

Poster Number 16

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Sunday, February 3, 2013
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Sutie Xu, Julius Adewopo, Maria Lucia Silveira and Kanika Inglett, Soil and Water Science Department, University of Florida, Gainesville, FL
Land use intensification often has impacts on plant communities and soil characteristics leading to a change in ecosystem carbon (C) cycling, especially on soil C storage. The objective of this research is to investigate the long-term effects of land use change on plant biomass, soil organic C stocks and characteristics, and on microbial community structure and activities in subtropical grasslands. Experimental sites include three grassland ecosystems: native rangelands, pine-bahiagrass silvopasture, and intensively-managed grazed bahiagrass pastures (improved pasture) receiving nitrogen (N) fertilizer. Results indicate that silvopasture system has greater litter C mass and soil C associated with the mineral fraction relative to native rangelands and improved pastures.  Data also shows that despite greater root biomass (0 to 100 cm soil depth), soil C stock and particulate organic C in native rangelands is smaller than improved pastures. These findings suggest that proper fertilization and grazing management may promote soil C accumulation in subtropical ecosystems.
See more from this Division: Submissions
See more from this Session: Graduate Student Poster Soils