Abstract
We examined the effects of atmospheric carbon dioxide (CO2) enrichment on belowground carbon (C) pools and arbuscular mycorrhizal (AM) fungi in a chaparral community in southern California. Chambers enclosing intact mesocosms dominated by Adenostoma fasciculatum were exposed for 3.5 years to CO2 levels ranging from 250 to 750 ppm. Pools of total C in bulk soil and in water-stable aggregates (WSA) increased 1.5- and threefold, respectively, between the 250- and 650-ppm treatments. In addition, the abundance of live AM hyphae and spores rose markedly over the same range of CO2, and the community composition shifted toward dominance by the AM genera Scutellospora and Acaulospora. Net ecosystem exchange of C with the atmosphere declined with CO2 treatment. It appears that under CO2 enrichment, extra C was added to the soil via AM fungi. Moreover, AM fungi were predominant in WSA and may shunt C into these aggregates versus bulk soil. Alternatively, C may be retained longer within WSA than within bulk soil. We note that differences between the soil fractions may act as a potential feedback on C cycling between the soil and atmosphere.
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Acknowledgements
We thank Matthias Rillig and Steven Hastings for supplying raw data, and Christina Doljanin, Roberto Lepe, Kelly Lamb, Elaine Olivares, and Pablo Bryant for technical assistance. This work was funded by US Department of Energy’s Office of Science (Program for Ecosystem Research) grants to MFA and WCO, by an NSF postdoctoral fellowship awarded in 1998 to KKT, and by grants from the US Department of Energy’s Western Regional Center (WESTGEC) of the National Institute for Global Environmental Change (NIGEC), Southern California Edison (SCE), The Electric Power Research Institute (EPRI), the National Science Foundation to WCO. Support was also provided by San Diego State University (SDSU) and the San Diego State University Foundation (SDSUF) to WCO and MFA.
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Treseder, K., Egerton-Warburton, L., Allen, M. et al. Alteration of Soil Carbon Pools and Communities of Mycorrhizal Fungi in Chaparral Exposed to Elevated Carbon Dioxide . Ecosystems 6, 786–796 (2003). https://doi.org/10.1007/s10021-003-0182-4
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DOI: https://doi.org/10.1007/s10021-003-0182-4