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Title: Importance of biophysical effects on climate warming mitigation potential of biofuel crops over the conterminous United States

Abstract

Abstract Current quantification of climate warming mitigation potential ( CWMP ) of biomass‐derived energy has focused primarily on its biogeochemical effects. This study used site‐level observations of carbon, water, and energy fluxes of biofuel crops to parameterize and evaluate the community land model ( CLM ) and estimate CO 2 fluxes, surface energy balance, soil carbon dynamics of corn ( Zea mays ), switchgrass ( Panicum virgatum ), and miscanthus ( Miscanthus × giganteus ) ecosystems across the conterminous United States considering different agricultural management practices and land‐use scenarios. We find that neglecting biophysical effects underestimates the CWMP of transitioning from croplands and marginal lands to energy crops. Biogeochemical effects alone result in changes in carbon storage of −1.9, 49.1, and 69.3 g C m −2 y −1 compared to 20.5, 78.5, and 96.2 g C m −2 y −1 when considering both biophysical and biogeochemical effects for corn, switchgrass, and miscanthus, respectively. The biophysical contribution to CWMP is dominated by changes in latent heat fluxes. Using the model to optimize growth conditions through fertilization and irrigation increases the CWMP further to 79.6, 98.3, and 118.8 g C m −2 y −1 , respectively, representing the upper threshold for CWMP . Results alsomore » show that the CWMP over marginal lands is lower than that over croplands. This study highlights that neglecting the biophysical effects of altered surface energy and water balance underestimates the CWMP of transitioning to bioenergy crops at regional scales.« less

Authors:
 [1];  [1];  [2];  [3]
  1. Department of Earth, Atmospheric, and Planetary Sciences Purdue University West Lafayette IN 47907 USA
  2. Department of Plant Biology University of Illinois Urbana IL USA
  3. Department of Plant Biology University of Illinois Urbana IL USA, Global Change and Photosynthesis Research Unit USDA‐ARS Urbana IL USA
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1259325
Alternate Identifier(s):
OSTI ID: 1259326; OSTI ID: 1393452
Grant/Contract Number:  
DE‐FG02‐08ER64599; FG02-08ER64599
Resource Type:
Published Article
Journal Name:
Global Change Biology. Bioenergy
Additional Journal Information:
Journal Name: Global Change Biology. Bioenergy Journal Volume: 9 Journal Issue: 3; Journal ID: ISSN 1757-1693
Publisher:
Wiley-Blackwell
Country of Publication:
United Kingdom
Language:
English
Subject:
09 BIOMASS FUELS; agricultural management; biofuel crops; biophysical effect; carbon sequestration; community land model; marginal land

Citation Formats

Zhu, Peng, Zhuang, Qianlai, Eva, Joo, and Bernacchi, Carl. Importance of biophysical effects on climate warming mitigation potential of biofuel crops over the conterminous United States. United Kingdom: N. p., 2016. Web. doi:10.1111/gcbb.12370.
Zhu, Peng, Zhuang, Qianlai, Eva, Joo, & Bernacchi, Carl. Importance of biophysical effects on climate warming mitigation potential of biofuel crops over the conterminous United States. United Kingdom. https://doi.org/10.1111/gcbb.12370
Zhu, Peng, Zhuang, Qianlai, Eva, Joo, and Bernacchi, Carl. Tue . "Importance of biophysical effects on climate warming mitigation potential of biofuel crops over the conterminous United States". United Kingdom. https://doi.org/10.1111/gcbb.12370.
@article{osti_1259325,
title = {Importance of biophysical effects on climate warming mitigation potential of biofuel crops over the conterminous United States},
author = {Zhu, Peng and Zhuang, Qianlai and Eva, Joo and Bernacchi, Carl},
abstractNote = {Abstract Current quantification of climate warming mitigation potential ( CWMP ) of biomass‐derived energy has focused primarily on its biogeochemical effects. This study used site‐level observations of carbon, water, and energy fluxes of biofuel crops to parameterize and evaluate the community land model ( CLM ) and estimate CO 2 fluxes, surface energy balance, soil carbon dynamics of corn ( Zea mays ), switchgrass ( Panicum virgatum ), and miscanthus ( Miscanthus × giganteus ) ecosystems across the conterminous United States considering different agricultural management practices and land‐use scenarios. We find that neglecting biophysical effects underestimates the CWMP of transitioning from croplands and marginal lands to energy crops. Biogeochemical effects alone result in changes in carbon storage of −1.9, 49.1, and 69.3 g C m −2 y −1 compared to 20.5, 78.5, and 96.2 g C m −2 y −1 when considering both biophysical and biogeochemical effects for corn, switchgrass, and miscanthus, respectively. The biophysical contribution to CWMP is dominated by changes in latent heat fluxes. Using the model to optimize growth conditions through fertilization and irrigation increases the CWMP further to 79.6, 98.3, and 118.8 g C m −2 y −1 , respectively, representing the upper threshold for CWMP . Results also show that the CWMP over marginal lands is lower than that over croplands. This study highlights that neglecting the biophysical effects of altered surface energy and water balance underestimates the CWMP of transitioning to bioenergy crops at regional scales.},
doi = {10.1111/gcbb.12370},
journal = {Global Change Biology. Bioenergy},
number = 3,
volume = 9,
place = {United Kingdom},
year = {Tue Jun 21 00:00:00 EDT 2016},
month = {Tue Jun 21 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1111/gcbb.12370

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