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Title: Perennial rhizomatous grasses as bioenergy feedstock in SWAT: parameter development and model improvement

Abstract

The Soil and Water Assessment Tool (SWAT) is increasingly used to quantify hydrologic and water quality impacts of bioenergy production, but crop-growth parameters for candidate perennial rhizomatous grasses (PRG) Miscanthus × giganteus and upland ecotypes of Panicum virgatum (switchgrass) are limited by the availability of field data. Crop-growth parameter ranges and suggested values were developed in this study using agronomic and weather data collected at the Purdue University Water Quality Field Station in northwestern Indiana. During the process of parameterization, the comparison of measured data with conceptual representation of PRG growth in the model led to three changes in the SWAT 2009 code: the harvest algorithm was modified to maintain belowground biomass over winter, plant respiration was extended via modified-DLAI to better reflect maturity and leaf senescence, and nutrient uptake algorithms were revised to respond to temperature, water, and nutrient stress. Parameter values and changes to the model resulted in simulated biomass yield and leaf area index consistent with reported values for the region. Code changes in the SWAT model improved nutrient storage during dormancy period and nitrogen and phosphorus uptake by both switchgrass and Miscanthus.

Authors:
 [1];  [2];  [3];  [4];  [3];  [3]
  1. Purdue Univ., West Lafayette, IN (United States). Dept. of Agricultural and Biological Engineering. Dept. of Agronomy
  2. Purdue Univ., West Lafayette, IN (United States). Dept. of Agricultural and Biological Engineering
  3. Purdue Univ., West Lafayette, IN (United States). Dept. of Agronomy
  4. Purdue Univ., West Lafayette, IN (United States). Dept. of Agricultural and Biological Engineering. Dept. of Earth, Atmospheric and Planetary Sciences
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office (BETO); USDA National Inst. of Food and Agriculture (NIFA)
OSTI Identifier:
1437637
Alternate Identifier(s):
OSTI ID: 1400445
Grant/Contract Number:  
EE0004396; 2011-68005-30411
Resource Type:
Accepted Manuscript
Journal Name:
Global Change Biology. Bioenergy
Additional Journal Information:
Journal Volume: 7; Journal Issue: 6; Journal ID: ISSN 1757-1693
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; bioenergy feedstock; hydrologic model; Miscanthus; model parameterization; perennial rhizomatous grass; soil and water assessment tool; switchgrass

Citation Formats

Trybula, Elizabeth M., Cibin, Raj, Burks, Jennifer L., Chaubey, Indrajeet, Brouder, Sylvie M., and Volenec, Jeffrey J. Perennial rhizomatous grasses as bioenergy feedstock in SWAT: parameter development and model improvement. United States: N. p., 2014. Web. doi:10.1111/gcbb.12210.
Trybula, Elizabeth M., Cibin, Raj, Burks, Jennifer L., Chaubey, Indrajeet, Brouder, Sylvie M., & Volenec, Jeffrey J. Perennial rhizomatous grasses as bioenergy feedstock in SWAT: parameter development and model improvement. United States. https://doi.org/10.1111/gcbb.12210
Trybula, Elizabeth M., Cibin, Raj, Burks, Jennifer L., Chaubey, Indrajeet, Brouder, Sylvie M., and Volenec, Jeffrey J. Fri . "Perennial rhizomatous grasses as bioenergy feedstock in SWAT: parameter development and model improvement". United States. https://doi.org/10.1111/gcbb.12210. https://www.osti.gov/servlets/purl/1437637.
@article{osti_1437637,
title = {Perennial rhizomatous grasses as bioenergy feedstock in SWAT: parameter development and model improvement},
author = {Trybula, Elizabeth M. and Cibin, Raj and Burks, Jennifer L. and Chaubey, Indrajeet and Brouder, Sylvie M. and Volenec, Jeffrey J.},
abstractNote = {The Soil and Water Assessment Tool (SWAT) is increasingly used to quantify hydrologic and water quality impacts of bioenergy production, but crop-growth parameters for candidate perennial rhizomatous grasses (PRG) Miscanthus × giganteus and upland ecotypes of Panicum virgatum (switchgrass) are limited by the availability of field data. Crop-growth parameter ranges and suggested values were developed in this study using agronomic and weather data collected at the Purdue University Water Quality Field Station in northwestern Indiana. During the process of parameterization, the comparison of measured data with conceptual representation of PRG growth in the model led to three changes in the SWAT 2009 code: the harvest algorithm was modified to maintain belowground biomass over winter, plant respiration was extended via modified-DLAI to better reflect maturity and leaf senescence, and nutrient uptake algorithms were revised to respond to temperature, water, and nutrient stress. Parameter values and changes to the model resulted in simulated biomass yield and leaf area index consistent with reported values for the region. Code changes in the SWAT model improved nutrient storage during dormancy period and nitrogen and phosphorus uptake by both switchgrass and Miscanthus.},
doi = {10.1111/gcbb.12210},
journal = {Global Change Biology. Bioenergy},
number = 6,
volume = 7,
place = {United States},
year = {Fri Jun 13 00:00:00 EDT 2014},
month = {Fri Jun 13 00:00:00 EDT 2014}
}

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