Nitrogen decreases and precipitation increases ectomycorrhizal extramatrical mycelia production in a longleaf pine forest |
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Authors: | Email author" target="_blank">Stephanie?E?SimsEmail author Joseph?J?Hendricks Robert?J?Mitchell Kevin?A?Kuehn Stephen?D?Pecot |
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Institution: | (1) Joseph W. Jones Ecological Research Center at Ichauway, Rt. 2, P.O. Box 2324, Newton, GA 39870, USA;(2) Department of Biology, University of West Georgia, Carrollton, GA 30118, USA;(3) Department of Biological Sciences, The University of Southern Mississippi, Hattiesburg, MS 39406, USA |
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Abstract: | The rates and controls of ectomycorrhizal fungal production were assessed in a 22-year-old longleaf pine (Pinus palustris Mill.) plantation using a complete factorial design that included two foliar scorching (control and 95% plus needle scorch)
and two nitrogen (N) fertilization (control and 5 g N m−2 year−1) treatments during an annual assessment. Ectomycorrhizal fungi production comprised of extramatrical mycelia, Hartig nets
and mantles on fine root tips, and sporocarps was estimated to be 49 g m−2 year−1 in the control treatment plots. Extramatrical mycelia accounted for approximately 95% of the total mycorrhizal production
estimate. Mycorrhizal production rates did not vary significantly among sample periods throughout the annual assessment (p = 0.1366). In addition, reduction in foliar leaf area via experimental scorching treatments did not influence mycorrhizal
production (p = 0.9374), suggesting that stored carbon (C) may decouple the linkage between current photosynthate production and ectomycorrhizal
fungi dynamics in this forest type. Nitrogen fertilization had a negative effect, whereas precipitation had a positive effect
on mycorrhizal fungi production (p = 0.0292; r
2 = 0.42). These results support the widely speculated but poorly documented supposition that mycorrhizal fungi are a large
and dynamic component of C flow and nutrient cycling dynamics in forest ecosystems. |
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Keywords: | Mycorrhizal fungi Extramatrical mycelia Extraradical hypha Biomass Production |
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