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• W2183614476 abstract "Carbon storage in soil is favored by degradation of plant litter through fungal degradation pathways as compared to those involving bacteria. Environmental factors affecting the fungal:bacterial ratios in soils thus can potentially influence the accumulation of soil carbon. The objectives of this research was to examine the carbon storage pathways involving the fungal and bacterial biomass components, and the extent to which these pathways shift in response to soil nitrogen in the semiarid coastal sage scrub plant communities of Southern California. Experiments were conducted on preexisting field plots in coastal sage vegetation along a previously characterized nitrogen deposition gradient. The activities of bacteria and fungi were measured using a combination of selective antibiotic inhibition techniques in conjunction with substrate-induced respiration (SIR) assays. Relative shifts in fungal:bacterial biomass were performed using phospholipid fatty acid analysis (PLFA). Results showed that the microbial communities from all soils sampled along the nitrogen deposition gradient were highly similar with respect to their relative composition of fungi, bacteria, and actinomycetes. Fungal-specific biomarkers comprised on average one third of the total PLFA, but likely underestimate the actual percent composition of the community. SIR assays indicated that fungi were responsible for the majority of the soil respiration and carbon turnover irrespective of differences in total or soluble soil nitrogen. Soils containing high nitrogen had higher respiration rates per unit biomass, which suggests that they will not accumulate carbon at the same rates as the soils with low nitrogen. As there was no apparent effect of relatively small differences in nitrogen between soils, an additional experimental treatment was established to examine the impact of supplemental nitrogen provided as 100 ppm ammonium nitrate on sites under low and high atmospheric nitrogen deposition. At this time, the overall impact of nitrogen deposition on altering fungal:bacterial ratios in arid grassland ecosystems is not significant. However, both seasonal and annual variation in soil moisture and temperature, as well as changes in vegetation from CSS to grassland may contribute to long-term changes that were not apparent in the short-term period over which this study was conducted. The present study provides baseline data for monitoring future changes in the relationship between soil carbon and microbial communities in Southern California." @default.
• W2183614476 created "2016-06-24" @default.
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• W2183614476 date "2006-01-01" @default.
• W2183614476 modified "2023-09-22" @default.
• W2183614476 title "Impact of Atmospheric Nitrogen Deposition on Carbon Storage Pathways Along a Nitrogen Deposition Gradient in Coastal Sage Scrub Soils" @default.
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