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    Author(s): Nicholas J. Bouskill; Tana E. Wood; Richard Baran; Zaw Ye; Benjamin P. Bowen; HsiaoChien Lim; Jizhong Zhou; Joy D. Van Nostrand; Peter Nico; Trent R. Northen; Whendee L. Silver; Eoin L. Brodie
    Date: 2016
    Source: Frontiers in Microbiology
    Publication Series: Scientific Journal (JRNL)
    Station: International Institute of Tropical Forestry
    PDF: Download Publication  (474.0 KB)


    Global climate models predict a future of increased severity of drought in many tropical forests. Soil microbes are central to the balance of these systems as sources or sinks of atmospheric carbon (C), yet how they respond metabolically to drought is not well-understood. We simulated drought in the typically aseasonal Luquillo Experimental Forest, Puerto Rico, by intercepting precipitation falling through the forest canopy. This approach reduced soil moisture by 13% and water potential by 0.14 MPa (from -0.2 to -0.34). Previous results from this experiment have demonstrated that the diversity and composition of these soil microbial communities are sensitive to even small changes in soil water. Here, we show prolonged drought significantly alters the functional potential of the community and provokes a clear osmotic stress response, including the production of compatible solutes that increase intracellular C demand. Subsequently, a microbial population emerges with a greater capacity for extracellular enzyme production targeting macromolecular carbon. Significantly, some of these drought-induced functional shifts in the soil microbiota are attenuated by prior exposure to a short-term drought suggesting that acclimation may occur despite a lack of longer-term drought history.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Bouskill, Nicholas J.; Wood, Tana E.; Baran, Richard; Ye, Zaw; Bowen, Benjamin P.; Lim, HsiaoChien; Zhou, Jizhong; Nostrand, Joy D. Van; Nico, Peter; Northen, Trent R.; Silver, Whendee L.; Brodie, Eoin L. 2016. Belowground Response to Drought in a Tropical Forest Soil. I. Changes in Microbial Functional Potential and Metabolism. Frontiers in Microbiology, Vol. 7(333): 525-.


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    tropical forests, drought, microbial ecology, osmolytes, functional gene microarray, Luquillo Experimental Forest, carbon, throughfall exclusion, soil moisture

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