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Soil Carbon, Nitrogen, and Ergot Alkaloids with Short- and Long-Term Exposure to Endophyte-Infected and Endophyte-Free Tall Fescue

^a USDA-ARS, 1420 Experiment Station Road, Watkinsville, GA 30677-2373
^b Dep. of Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30602-7272

View larger version (25K): [in a new window]   Fig. 1. Cumulative C mineralization during 32 d of incubation and soil microbial biomass C at the end of 32 d of incubation as affected by addition of endophyte-free (E–) and endophyte-infected (E+) tall fescue leaf tissue in soil exposed to long-term history of E– and E+ tall fescue.

View larger version (25K): [in a new window]   Fig. 2. Soil inorganic N accumulation during 32 d of incubation and soil microbial biomass N at the end of 32 d of incubation as affected by addition of endophyte-free (E–) and endophyte-infected (E+) tall fescue leaf tissue in soil exposed to long-term history of E– and E+ tall fescue.

View larger version (27K): [in a new window]   Fig. 3. Fraction of inorganic N as nitrate during 32 d of incubation as affected by addition of endophyte-free (E–) and endophyte-infected (E+) tall fescue leaf tissue in soil exposed to long-term history of endophyte-free and endophyte-infected tall fescue.

View larger version (26K): [in a new window]   Fig. 4. Ergot alkaloids in soil sediment (<1 mm, i.e., fine sand + silt) during 32 d of incubation as affected by addition of endophyte-free (E–) and endophyte-infected (E+) tall fescue leaf tissue in soil exposed to long-term history of E– and E+ tall fescue.

View larger version (28K): [in a new window]   Fig. 5. Ergot alkaloids in the coarse fraction (>1 mm, i.e., coarse sand + remaining leaves) during 32 d of incubation as affected by addition of endophyte-free (E–) and endophyte-infected (E+) tall fescue leaf tissue in soil exposed to long-term history of E– and E+ tall fescue. Curve in each panel represents an exponential decay model fitted to the data for soil plus E+ leaves. Area between dotted lines represents the 95% confidence interval for the combination of soil only and soil plus E– leaves.

View larger version (28K): [in a new window]   Fig. 6. Ergot alkaloids extracted in water during 32 d of incubation as affected by addition of endophyte-free (E–) and endophyte-infected (E+) tall fescue leaf tissue in soil exposed to long-term history of E– and E+ tall fescue.