Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands
Abstract
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 (Rs: 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 Rs 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,more »
- Authors:
-
[1];
[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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; USDA
- OSTI Identifier:
- 1434218
- Alternate Identifier(s):
- OSTI ID: 1434219; OSTI ID: 1476396
- Grant/Contract Number:
- AC05-00OR22725; 1005761
- Resource Type:
- Published Article
- Journal Name:
- Global Change Biology. Bioenergy
- Additional Journal Information:
- Journal Name: Global Change Biology. Bioenergy Journal Volume: 10 Journal Issue: 8; Journal ID: ISSN 1757-1693
- Publisher:
- Wiley
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; exoenzyme activities; heterotrophic respiration; microbial biomass; microbial growth efficiency; nitrogen fertilization; soil warming; switchgrass
Citation Formats
Li, Jianwei, Jian, Siyang, de Koff, Jason P., Lane, Chad S., Wang, Gangsheng, Mayes, Melanie A., and Hui, Dafeng. Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands. United Kingdom: N. p., 2018.
Web. doi:10.1111/gcbb.12515.
Li, Jianwei, Jian, Siyang, de Koff, Jason P., Lane, Chad S., Wang, Gangsheng, Mayes, Melanie A., & Hui, Dafeng. Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands. United Kingdom. https://doi.org/10.1111/gcbb.12515
Li, Jianwei, Jian, Siyang, de Koff, Jason P., Lane, Chad S., Wang, Gangsheng, Mayes, Melanie A., and Hui, Dafeng. Wed .
"Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands". United Kingdom. https://doi.org/10.1111/gcbb.12515.
@article{osti_1434218,
title = {Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands},
author = {Li, Jianwei and Jian, Siyang and de Koff, Jason P. and Lane, Chad S. and Wang, Gangsheng and Mayes, Melanie A. and Hui, Dafeng},
abstractNote = {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 (Rs: 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 Rs 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.},
doi = {10.1111/gcbb.12515},
journal = {Global Change Biology. Bioenergy},
number = 8,
volume = 10,
place = {United Kingdom},
year = {Wed Apr 04 00:00:00 EDT 2018},
month = {Wed Apr 04 00:00:00 EDT 2018}
}
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