Results and discussion

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Presentation transcript:

Results and discussion Our results suggest that chronic N deposition causes a decline in litter decomposition. A decline in microbial respiration and N demand in soil exposed to chronic N inputs could act to increase soil C storage and N availability in these semiarid shrublands. Introduction Atmospheric N deposition is estimated to be 20-45 kgN ha-1 yr-1 in polluted southern Californian chaparral and coastal sage scrub. Dry deposition accounts for 85-90% of anthropogenic N and accumulates on the surfaces of plants and soil during summer and fall. N accumulation has the potential to alter soil C and N storage and cycling. Hypothesis: Chronic N addition will increase initial rates of microbial respiration and N-mineralization. Litter and soil C and N mineralization dynamics for a coastal sage scrub ecosystem exposed to chronic experimental N deposition LaTeasha N. Edelman, Judy Garza, and George L Vourlitis Department of Biological Sciences, California State University, San Marcos, CA, USA Results and discussion There was a significant soil x time interaction with microbial respiration. Soil exposed to added N had a higher initial, but a lower final, respiration rate. Measuring CO2 efflux Experimental design at SMER Fenn et al. (2010) JEMA 91: 2404-2423 Salvia mellifera This research was supported by the NSF-CAREER (DEB-0133259), NIH-NIGMS-SCORE (S06 GM 59833), and USDA-NIFA-HSI (2010-38422-21241). Access to the Santa Margarita Ecological Reserve granted by San Diego State University is gratefully acknowledged. Acknowledgements Conclusions Microbial respiration N mineralization was significantly higher in soil exposed to added N. Experimental N enrichment significantly increased litter N concentration and decreased litter C:N ratio; however, litter structural chemistry was not affect by N addition. N mineralization Total C mineralization was significantly depressed in soil exposed to added N, while N mineralization was significantly higher in soil exposed to added N. These data indicate that greater microbial growth in control soil increased microbial N demand Methods Plots (100 m2) at the Santa Margarita Ecological Reserve have received annual inputs of ambient (control, n = 4) or added N (50 kgN ha-1 yr-1; n = 4) since October 2002. Soil cores (0-10 cm) and leaf litter of Salvia mellifera collected from added N and control plots were used in a factorial laboratory experiment with control and added N soil and litter as treatment factors (n = 4 per treatment combination). N mineralization (NH4+ + NO3-) and microbial respiration was periodically measured over 28 weeks.