Record ID No. |
1958 |
Author(s) |
Garcia M.O., Ovasapyan T., Greas M., Treseder K.K , 2008 |
Affiliation |
Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine,CA 92697 USA |
Title |
Mycorrhizal dynamics under elevated CO2 and nitrogen fertilization in a warm temperate forest |
Source. Vol.(no):Page |
Plant and Soil.303(1-2):301-310p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
United States |
Abstracts |
We examined the response of mycorrhizal fungi to free-air CO2 enrichment (FACE)
and nitrogen (N) fertilization in a warm temperate forest to better understand potential
influences over plant nutrient uptake and soil carbon (C) storage. In particular, we hypothesized
that mycorrhizal fungi and glomalin would become more prevalent under elevated CO2 but decrease
under N fertilization. In addition, we predicted that N fertilization would mitigate any positive
effects of elevated CO2 on mycorrhizal abundance. Overall, we observed a 14% increase in
ectomycorrhizal (ECM) root colonization under CO2 enrichment, which implies that elevated CO2
results in greater C investments in these fungi. Arbuscular mycorrhizal (AM) hyphal length and
glomalin stocks did not respond substantially to CO2 enrichment, and effects of CO2 on AM root
colonization varied by date. Nitrogen effects on AM fungi were not consistent with our
hypothesis, as we found an increase in AM colonization under N fertilization. Lastly, neither
glomalin concentrations nor ECM colonization responded significantly to N fertilization or to an
N-by-CO2 interaction. A longer duration of N fertilization may be required to detect effects on
these parameters. |