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Inter-Annual Precipitation Variability Decreases Switchgrass Productivity from Arid to Mesic Environments

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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. Predicted changes in the amount and timing of precipitation thus likely will exert greater influence on production of upland than lowland ecotypes of switchgrass.

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Acknowledgements

Research was funded by USDA-NIFA (2010-65615-20632). Mention of trade names or commercial products does not imply recommendation or endorsement by the USDA. We thank E. Nelson and A. Gibson for assistance with database construction. USDA is an equal opportunity provider and employer.

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Authors and Affiliations

  1. Plant and Microbial Biology, UC Berkeley, 111 Koshland Hall, Berkeley, CA, 94720, USA

    Lara G. Reichmann

  2. USDA-ARS Grassland, Soil and Water Research Laboratory, 808 E Blackland Rd, Temple, TX, 76502, USA

    Harold P. Collins, Jim R. Kiniry, H. Wayne Polley & Philip A. Fay

  3. USDA-ARS, Agroecosystem Management Research Unit, 251 Filley Hall, UNL, East Campus, Lincoln, NE, 68583, USA

    Virginia L. Jin

  4. USDA-NRCS, 808 E Blackland Rd, Temple, TX, 76502, USA

    Mari-Vaughn V. Johnson

  5. USDA-ARS Wheat, Sorghum, and Forage Research Unit, 251 Filley Hall, UNL, East Campus, Lincoln, NE, 68583, USA

    Robert B. Mitchell

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  1. Lara G. Reichmann
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Reichmann, L.G., Collins, H.P., Jin, V.L. et al. Inter-Annual Precipitation Variability Decreases Switchgrass Productivity from Arid to Mesic Environments. Bioenerg. Res. 11, 614–622 (2018). https://doi.org/10.1007/s12155-018-9922-3

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