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Title: Switchgrass cropping systems affect soil carbon and nitrogen and microbial diversity and activity on marginal lands

Journal Article · · Global Change Biology. Bioenergy
DOI: https://doi.org/10.1111/gcbb.12949 · OSTI ID:1867960
ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5];  [6];  [3];  [2]; ORCiD logo [1]
  1. Department of Plant Pathology Washington State University Pullman Washington USA
  2. Department of Plant, Soil and Microbial Sciences Michigan State University East Lansing Michigan USA
  3. W.K. Kellogg Biological Station, Department of Integrative Biology Michigan State University Hickory Corners Michigan USA
  4. W.K. Kellogg Biological Station, Department of Integrative Biology Michigan State University Hickory Corners Michigan USA, Laboratory of Environmental Microbiology Institute of Microbiology of the Czech Academy of Sciences Prague Czech Republic
  5. Department of Plant, Soil and Microbial Sciences Michigan State University East Lansing Michigan USA, Biological Sciences Division, Earth and Biological Sciences Directorate Pacific Northwest National Laboratory Richland Washington USA
  6. Department of Plant Sciences University of California Davis Davis California USA

Abstract Switchgrass ( Panicum virgatum L.), as a dedicated bioenergy crop, can provide cellulosic feedstock for biofuel production while improving or maintaining soil quality. However, comprehensive evaluations of how switchgrass cultivation and nitrogen (N) management impact soil and plant parameters remain incomplete. We conducted field trials in three years (2016–2018) at six locations in the North Central Great Lakes Region to evaluate the effects of cropping systems (switchgrass, restored prairie, undisturbed control) and N rates (0, 56 kg N ha −1  year −1 ) on biomass yield and soil physicochemical, microbial, and enzymatic parameters. Switchgrass cropping system yielded an aboveground biomass 2.9–3.3 times higher than the other two systems (Jayawardena et al., unpublished data) but our study found that this biomass accumulation did not reduce soil dissolved organic C, total dissolved N (TDN), or bacterial diversity. The annual aboveground biomass removal for bioenergy feedstock, however, reduced soil microbial biomass C (MBC) and microbial biomass N (MBN) and bacterial richness in the second and third years; despite this, continuous monocropping of switchgrass improved soil TDN, inorganic N, bacterial diversity, and shoot biomass in the second and/or third years compared with the first year. N fertilization increased aboveground biomass yield by 1.2 times and significantly increased soil TDN, MBN, and the shoot biomass of switchgrass compared with the unfertilized control. Locations with higher C and N contents and lower C:N ratio had higher aboveground biomass, MBC, MBN, and the activity of BG, CBH, and UREA enzymes; by contrast, locations with higher pH had higher soil TDN and activity of NAG and LAP enzymes. Our research demonstrates that switchgrass cultivation could improve or maintain soil N content and N fertilization can increase plant biomass yield. The comprehensive data also can inform future biogeochemical models to successfully implement switchgrass for bioenergy production.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1867960
Report Number(s):
PNNL-SA-177044
Journal Information:
Global Change Biology. Bioenergy, Journal Name: Global Change Biology. Bioenergy Journal Issue: 8 Vol. 14; ISSN 1757-1693
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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