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Title: Miscanthus biomass productivity within US croplands and its potential impact on soil organic carbon

Journal Article · · Global Change Biology. Bioenergy
 [1];  [2];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Environmental Science Division; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division; Univ. of California Berkeley, Berkeley, CA (United States). Energy and Resources Group
  3. Univ. of California Berkeley, Berkeley, CA (United States). Energy and Resources Group

Interest in bioenergy crops is increasing due to their potential to reduce greenhouse gas emissions and dependence on fossil fuels. Here, we combined process-based and geospatial models to estimate the potential biomass productivity of miscanthus and its potential impact on soil carbon stocks in the croplands of the continental United States. The optimum (climatic potential) rainfed productivity for field-dried miscanthus biomass ranged from 1 to 23 Mg biomass ha-1 yr-1, with a spatial average of 13 Mg ha-1 yr-1 and a coefficient of variation of 30%. This variation resulted primarily from the spatial heterogeneity of effective rainfall, growing degree days, temperature, and solar radiation interception. Cultivating miscanthus would result in a soil organic carbon (SOC) sequestration at the rate of 0.16–0.82 Mg C ha-1 yr-1 across the croplands due to cessation of tillage and increased biomass carbon input into the soil system. We identified about 81 million ha of cropland, primarily in the eastern United States, that could sustain economically viable (>10 Mg ha-1 yr-1) production without supplemental irrigation, of which about 14 million ha would reach optimal miscanthus growth. To meet targets of the US Energy Independence and Security Act of 2007 using miscanthus as feedstock, 19 million ha of cropland would be needed (spatial average 13 Mg ha-1 yr-1) or about 16% less than is currently dedicated to US corn-based ethanol production.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231
OSTI ID:
1396036
Journal Information:
Global Change Biology. Bioenergy, Vol. 5, Issue 4; ISSN 1757-1693
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (7)

Use of simulation-based statistical models to complement bioclimatic models in predicting continental scale invasion risks journal October 2018
Soil organic carbon and total nitrogen pools in permafrost zones of the Qinghai-Tibetan Plateau journal February 2018
Modelling the carbon cycle of Miscanthus plantations: existing models and the potential for their improvement journal March 2014
Phenomics analysis of drought responses in Miscanthus collected from different geographical locations journal September 2016
Valuation of ecosystem services in alternative bioenergy landscape scenarios journal March 2019
Modeling the impact of agricultural land use and management on US carbon budgets journal January 2015
Modeling the impact of agricultural land use and management on US carbon budgets journal January 2014