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Title: Switchgrass and Giant Miscanthus Biomass and Theoretical Ethanol Production from Reclaimed Mine Lands

Switchgrass ( Panicum virgatum L.) and giant miscanthus ( Miscanthus x giganteus Greef & Deuter ex Hodkinson & Renvoize) are productive on marginal lands in the eastern USA, but their productivity and composition have not been compared on mine lands. Our objectives were to compare biomass production, composition, and theoretical ethanol yield (TEY) and production (TEP) of these grasses on a reclaimed mined site. Following 25 years of herbaceous cover, vegetation was killed and plots of switchgrass cultivars Kanlow and BoMaster and miscanthus lines Illinois and MBX-002 were planted in five replications. Annual switchgrass and miscanthus yields averaged 5.8 and 8.9 Mg dry matter ha -1, respectively, during 2011 to 2015. Cell wall carbohydrate composition was analyzed via near-infrared reflectance spectroscopy with models based on switchgrass or mixed herbaceous samples including switchgrass and miscanthus. Concentrations were higher for glucan and lower for xylan in miscanthus than in switchgrass but TEY did not differ (453 and 450 L Mg -1, respectively). In response to biomass production, total ethanol production was greater for miscanthus than for switchgrass (5594 vs 3699 L ha -1), did not differ between Kanlow and BoMaster switchgrass (3880 and 3517 L ha -1, respectively), and was higher formore » MBX-002 than for Illinois miscanthus (6496 vs 4692 L ha -1). Relative to the mixed feedstocks model, the switchgrass model slightly underpredicted glucan and slightly overpredicted xylan concentrations. Estimated TEY was slightly lower from the switchgrass model but both models distinguished genotype, year, and interaction effects similarly. In conclusion, biomass productivity and TEP were similar to those from agricultural sites with marginal soils.« less
Authors:
 [1] ;  [2] ; ORCiD logo [2] ;  [3] ;  [4]
  1. USDA-Forest Service, Elkins, WV (United States)
  2. West Virginia Univ., Morgantown, WV (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. West Virginia Agriculture and Forestry Experiment Station, Morgantown, WV (United States)
Publication Date:
Report Number(s):
NREL/JA-2700-71743
Journal ID: ISSN 1939-1234
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
BioEnergy Research
Additional Journal Information:
Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 1939-1234
Publisher:
Springer
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; cellulosic bioenergy feedstock; mine reclamation; near-infrared reflectance spectroscopy; theoretical ethanol production; theoretical ethanol yield
OSTI Identifier:
1454747