Inter-Annual Precipitation Variability Decreases Switchgrass Productivity from Arid to Mesic Environments
Abstract
Cellulosic biofuels are an important source of renewable biomass within the alternative energy portfolio. Switchgrass (Panicum virgatum L.), a perennial C4 grass native to North America, is widely studied as a biofuel feedstock for its consistently high yields and minimal input requirements. The influences of precipitation amount and temporal variability on the fertilizer response of switchgrass productivity are not fully understood. Moreover, global climate models predict changes in rainfall patterns towards lower and increasingly variable soil water availability in several productive areas worldwide, which may impact net primary production of biofuel crops. We conducted a meta-analysis of aboveground net primary production of switchgrass from 48 publications encompassing 82 different locations, 11 soil types, 52 switchgrass cultivars, fertilizer inputs between 0 to 896 kg N ha–1 year–1, and 1 to 6 years of annual productivity measures repeated on the same stand. Productivity of the lowland ecotype doubled with N rates > 131 kg N ha–1 year–1, but upland ecotype productivity increased only by 50%. Results showed an optimum N rate of 30 to 60 kg N ha–1 year–1 for both ecotypes, after which biomass gain per unit of N added decreased. Growing season precipitation (GSPPT) and inter-annual precipitation variability (inter-PPTvar) affectedmore »
- Authors:
-
- Univ. of California, Berkeley, CA (United States)
- USDA-ARS, Temple, TX (United States)
- USDA-ARS, Lincoln, NE (United States)
- USDA-NRCS, Temple, TX (United States)
- Publication Date:
- Research Org.:
- Antares Group Inc., Conyers, GA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
- OSTI Identifier:
- 1853971
- Report Number(s):
- DOE-ANTARES-07088-2-7
Journal ID: ISSN 1939-1234
- Grant/Contract Number:
- EE0007088
- Resource Type:
- Accepted Manuscript
- Journal Name:
- BioEnergy Research
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 1939-1234
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Panicum virgatum L.; Primary production; Precipitation variability; Nitrogen fertilization; Resource limitation
Citation Formats
Reichmann, Lara G., Collins, Harold P., Jin, Virginia L., Johnson, Mari-Vaughn V., Kiniry, Jim R., Mitchell, Robert B., Polley, H. Wayne, and Fay, Philip A. Inter-Annual Precipitation Variability Decreases Switchgrass Productivity from Arid to Mesic Environments. United States: N. p., 2018.
Web. doi:10.1007/s12155-018-9922-3.
Reichmann, Lara G., Collins, Harold P., Jin, Virginia L., Johnson, Mari-Vaughn V., Kiniry, Jim R., Mitchell, Robert B., Polley, H. Wayne, & Fay, Philip A. Inter-Annual Precipitation Variability Decreases Switchgrass Productivity from Arid to Mesic Environments. United States. https://doi.org/10.1007/s12155-018-9922-3
Reichmann, Lara G., Collins, Harold P., Jin, Virginia L., Johnson, Mari-Vaughn V., Kiniry, Jim R., Mitchell, Robert B., Polley, H. Wayne, and Fay, Philip A. Tue .
"Inter-Annual Precipitation Variability Decreases Switchgrass Productivity from Arid to Mesic Environments". United States. https://doi.org/10.1007/s12155-018-9922-3. https://www.osti.gov/servlets/purl/1853971.
@article{osti_1853971,
title = {Inter-Annual Precipitation Variability Decreases Switchgrass Productivity from Arid to Mesic Environments},
author = {Reichmann, Lara G. and Collins, Harold P. and Jin, Virginia L. and Johnson, Mari-Vaughn V. and Kiniry, Jim R. and Mitchell, Robert B. and Polley, H. Wayne and Fay, Philip A.},
abstractNote = {Cellulosic biofuels are an important source of renewable biomass within the alternative energy portfolio. Switchgrass (Panicum virgatum L.), a perennial C4 grass native to North America, is widely studied as a biofuel feedstock for its consistently high yields and minimal input requirements. The influences of precipitation amount and temporal variability on the fertilizer response of switchgrass productivity are not fully understood. Moreover, global climate models predict changes in rainfall patterns towards lower and increasingly variable soil water availability in several productive areas worldwide, which may impact net primary production of biofuel crops. We conducted a meta-analysis of aboveground net primary production of switchgrass from 48 publications encompassing 82 different locations, 11 soil types, 52 switchgrass cultivars, fertilizer inputs between 0 to 896 kg N ha–1 year–1, and 1 to 6 years of annual productivity measures repeated on the same stand. Productivity of the lowland ecotype doubled with N rates > 131 kg N ha–1 year–1, but upland ecotype productivity increased only by 50%. Results showed an optimum N rate of 30 to 60 kg N ha–1 year–1 for both ecotypes, after which biomass gain per unit of N added decreased. Growing season precipitation (GSPPT) and inter-annual precipitation variability (inter-PPTvar) affected both ecotypes similarly. Long-term mean annual precipitation (MAP) differentially affected lowland and upland productivity, depending on the N level. Productivity responses to MAP and GSPPT were similar for both upland and lowland ecotypes at none or low N rates. When N increased beyond 60 kg N ha–1 year–1, lowland cultivars had a greater growth response to MAP than uplands. Productivity increased with increasing GSPPT and MAP and had a positive linear response to MAP ranging from 600 to 1200 mm year–1. One third of the variability in switchgrass production was accounted for by inter-PPTvar. After accounting for MAP, sites with higher inter-PPTvar had lower switchgrass productivity than sites with lower inter-PPTvar. Increased inter-annual variation in precipitation reduced production of both ecotypes. As a result, predicted changes in the amount and timing of precipitation thus likely will exert greater influence on production of upland than lowland ecotypes of switchgrass.},
doi = {10.1007/s12155-018-9922-3},
journal = {BioEnergy Research},
number = 3,
volume = 11,
place = {United States},
year = {Tue Jun 19 00:00:00 EDT 2018},
month = {Tue Jun 19 00:00:00 EDT 2018}
}
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