Belowground Response to Drought in a Tropical Forest Soil. II. Change in Microbial Function Impacts Carbon Composition

Bouskill, Nicholas J.; Wood, Tana E.; Baran, Richard; Hao, Zhao; Ye, Zaw; Bowen, Ben P.; Lim, Hsiao Chien; Nico, Peter S.; Holman, Hoi-Ying; Gilbert, Benjamin; Silver, Whendee L.; Northen, Trent R.; Brodie, Eoin L.

doi:10.3389/fmicb.2016.00323

Title: Belowground Response to Drought in a Tropical Forest Soil. II. Change in Microbial Function Impacts Carbon Composition

Journal Article · Tue Mar 15 00:00:00 EDT 2016 · Frontiers in Microbiology

DOI:https://doi.org/10.3389/fmicb.2016.00323· OSTI ID:1379159

Bouskill, Nicholas J. ^[1]; Wood, Tana E. ^[2]; Baran, Richard ^[3]; Hao, Zhao ^[1]; Ye, Zaw ^[1]; Bowen, Ben P. ^[3]; Lim, Hsiao Chien ^[1]; Nico, Peter S. ^[1]; Holman, Hoi-Ying ^[1]; Gilbert, Benjamin ^[1]; Silver, Whendee L. ^[4]; Northen, Trent R. ^[3]; Brodie, Eoin L. ^[5]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Climate and Ecosystem Sciences, Earth and Environmental Sciences
US Dept. of Agriculture (USDA) Forest Service, Rio Piedras, PR (United States); Puerto Rican Foundation of Conservation, San Juan, PR (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Environmental Genomics and Systems Biology
Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Climate and Ecosystem Sciences, Earth and Environmental Sciences; Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science

Climate model projections for tropical regions show clear perturbation of precipitation patterns leading to increased frequency and severity of drought in some regions. Previous work has shown declining soil moisture to be a strong driver of changes in microbial trait distribution, however, the feedback of any shift in functional potential on ecosystem properties related to carbon cycling are poorly understood. Here we show that drought-induced changes in microbial functional diversity and activity shape, and are in turn shaped by, the composition of dissolved and soil-associated carbon. We also demonstrate that a shift in microbial functional traits that favor the production of hygroscopic compounds alter the efflux of carbon dioxide following soil rewetting. Under drought the composition of the dissolved organic carbon pool changed in a manner consistent with a microbial metabolic response. We hypothesize that this microbial ecophysiological response to changing soil moisture elevates the intracellular carbon demand stimulating extracellular enzyme production, that prompts the observed decline in more complex carbon compounds (e.g., cellulose and lignin). Furthermore, a metabolic response to drought appeared to condition (biologically and physically) the soil, notably through the production of polysaccharides, particularly in experimental plots that had been pre-exposed to a short-term drought. This hysteretic response, in addition to an observed drought-related decline in phosphorus concentration, may have been responsible for a comparatively modest CO 2 efflux following wet-up in drought plots relative to control plots.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379159

Journal Information:: Frontiers in Microbiology, Vol. 7, Issue MAR; ISSN 1664-302X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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