Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands

Li, Jianwei; Jian, Siyang; de Koff, Jason P.; Lane, Chad S.; Wang, Gangsheng; Mayes, Melanie A.; Hui, Dafeng

doi:10.1111/gcbb.12515

Title: Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands

Journal Article · Wed Apr 04 00:00:00 EDT 2018 · Global Change Biology. Bioenergy

DOI:https://doi.org/10.1111/gcbb.12515· OSTI ID:1434218

^[1]; Jian, Siyang ^[1]; de Koff, Jason P. ^[1]; Lane, Chad S. ^[2];

^[3]; Mayes, Melanie A. ^[3];

^[4]

Department of Agriculture and Environmental Sciences, Tennessee State University, Nashville TN 37209 USA
Department of Earth and Ocean Sciences, University of North Carolina Wilmington, Wilmington NC 28403-5928 USA
Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge TN 37831 USA
Department of Biological Science, Tennessee State University, Nashville TN 37209 USA

The mechanistic understanding of warming and nitrogen (N) fertilization, alone or in combination, on microbially mediated decomposition is limited. Here, soil samples were collected from previously harvested switchgrass (Panicum virgatum L.) plots that had been treated with high N fertilizer (HN: 67 kg N ha^-1) and those that had received no N fertilizer (NN) over a 3-year period. The samples were incubated for 180 days at 15°C and 20°C, during which heterotrophic respiration, δ¹³C of CO₂, microbial biomass (MB), specific soil respiration rate (R_s: respiration per unit of microbial biomass), and exoenzyme activities were quantified at 10 different collections time. Employing switchgrass tissues (referred to as litter) with naturally abundant ¹³C allowed us to partition CO₂ respiration derived from soil and amended litter. Cumulative soil respiration increased significantly by 16.4% and 4.2% under warming and N fertilization, respectively. Respiration derived from soil was elevated significantly with warming, while oxidase, the agent for recalcitrant soil substrate decomposition, was not significantly affected by warming. Warming, however, significantly enhanced MB and R_s indicating a decrease in microbial growth efficiency (MGE). On the contrary, respiration derived from amended litter was elevated with N fertilization, which was consistent with the significantly elevated hydrolase. N fertilization, however, had little effect on MB and Rs, suggesting little change in microbial physiology. Temperature and N fertilization showed minimal interactive effects likely due to little differences in soil N availability between NN and HN samples, which is partly attributable to switchgrass biomass N accumulation (equivalent to ~53% of fertilizer N). Overall, the differential individual effects of warming and N fertilization may be driven by physiological adaptation and stimulated exoenzyme kinetics, respectively. The study shed insights on distinct microbial acquisition of different substrates under global temperature increase and N enrichment.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; USDA

Grant/Contract Number:: AC05-00OR22725; 1005761

OSTI ID:: 1434218

Alternate ID(s):: OSTI ID: 1434219; OSTI ID: 1476396

Journal Information:: Global Change Biology. Bioenergy, Journal Name: Global Change Biology. Bioenergy Vol. 10 Journal Issue: 8; ISSN 1757-1693

Publisher:: WileyCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 20 works

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Title: Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands

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