Organic amendments change soil organic C structure and microbial community but not total organic matter on sub-decadal scales
Abstract
Organic C has many benefits for soil, but it is depleted by tillage and crop harvest, and especially so for biofuel crops. Accordingly, strategies such as partially retaining stover or planting a cover crop can help ameliorate the negative effect of C removal. Here, we used a long-term field experiment to study the impacts of stover retention and planting a cover crop on soil organic matter (SOM), its extractable components, and the soil microbial community. SOM chemical composition characterization was determined by electrospray ionization (ESI) coupled with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) in sequential water, methanol (MeOH), and chloroform (CHCl3) extracts. The characteristics of the soil bacterial community were measured by phospholipid fatty acid (PLFA), real-time quantitative PCR, and 16S rRNA gene sequence. The variations in total SOM content, total microbial biomass, and bacterial population were slight among treatments, but SOM chemical compounds, arbuscular mycorrhizal fungi (AMF) biomass, and bacterial structure changed significantly, and especially so in the coupled application of stover retention and cover crop. Specifically, stover retention enriched more lignin-like compounds in soil, whereas cover crop enriched more condensed hydrocarbons, and had more compounds with an aromaticity index (AI) > 0.5. The bacterial community wasmore »
- Authors:
-
- Nanjing Univ. of Information Science and Technology (China); Michigan State Univ., MI (United States)
- Michigan State Univ., MI (United States); Washington State Univ., Richland, WA (United States)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of Arizona, Tucson, AZ (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Michigan State Univ., MI (United States)
- Publication Date:
- Research Org.:
- Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1682300
- Alternate Identifier(s):
- OSTI ID: 1776212
- Grant/Contract Number:
- SC0018409; FC02-07ER64494
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Soil Biology and Biochemistry
- Additional Journal Information:
- Journal Volume: 150; Journal ID: ISSN 0038-0717
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Corn stover retention; Rye cover crop; FT-ICR-MS; Phospholipid fatty acid; 16S rRNA gene; Bacterial community
Citation Formats
Xu, Jiangbing, Roley, Sarah S., Tfaily, Malak M., Chu, Rosalie K., and Tiedje, James M. Organic amendments change soil organic C structure and microbial community but not total organic matter on sub-decadal scales. United States: N. p., 2020.
Web. doi:10.1016/j.soilbio.2020.107986.
Xu, Jiangbing, Roley, Sarah S., Tfaily, Malak M., Chu, Rosalie K., & Tiedje, James M. Organic amendments change soil organic C structure and microbial community but not total organic matter on sub-decadal scales. United States. https://doi.org/10.1016/j.soilbio.2020.107986
Xu, Jiangbing, Roley, Sarah S., Tfaily, Malak M., Chu, Rosalie K., and Tiedje, James M. Sat .
"Organic amendments change soil organic C structure and microbial community but not total organic matter on sub-decadal scales". United States. https://doi.org/10.1016/j.soilbio.2020.107986. https://www.osti.gov/servlets/purl/1682300.
@article{osti_1682300,
title = {Organic amendments change soil organic C structure and microbial community but not total organic matter on sub-decadal scales},
author = {Xu, Jiangbing and Roley, Sarah S. and Tfaily, Malak M. and Chu, Rosalie K. and Tiedje, James M.},
abstractNote = {Organic C has many benefits for soil, but it is depleted by tillage and crop harvest, and especially so for biofuel crops. Accordingly, strategies such as partially retaining stover or planting a cover crop can help ameliorate the negative effect of C removal. Here, we used a long-term field experiment to study the impacts of stover retention and planting a cover crop on soil organic matter (SOM), its extractable components, and the soil microbial community. SOM chemical composition characterization was determined by electrospray ionization (ESI) coupled with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) in sequential water, methanol (MeOH), and chloroform (CHCl3) extracts. The characteristics of the soil bacterial community were measured by phospholipid fatty acid (PLFA), real-time quantitative PCR, and 16S rRNA gene sequence. The variations in total SOM content, total microbial biomass, and bacterial population were slight among treatments, but SOM chemical compounds, arbuscular mycorrhizal fungi (AMF) biomass, and bacterial structure changed significantly, and especially so in the coupled application of stover retention and cover crop. Specifically, stover retention enriched more lignin-like compounds in soil, whereas cover crop enriched more condensed hydrocarbons, and had more compounds with an aromaticity index (AI) > 0.5. The bacterial community was not altered by the cover crop, but the corn stover retention increased the relative abundances of Myxococcales (Deltaproteobacteria) and decreased that of Actinobacteria. Redundancy analysis (RDA) further revealed that the bacterial community in the stover treatments had a significant positive association with CHCl3-extracted chemical classes, i.e. unsaturated hydrocarbons and lipids, with the coupled application (stover and cover crop), and lignin and proteins with the corn stover only treatment. Taken together, our study shows how different C addition practices influence the molecular composition of SOM and the structure of soil microbial communities.},
doi = {10.1016/j.soilbio.2020.107986},
journal = {Soil Biology and Biochemistry},
number = ,
volume = 150,
place = {United States},
year = {Sat Sep 05 00:00:00 EDT 2020},
month = {Sat Sep 05 00:00:00 EDT 2020}
}
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