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Contrasting Physiological and Environmental Controls of Evapotranspiration over Kernza Perennial Crop, Annual Crops, and C 4 and Mixed C 3 /C 4 Grasslands

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  • Caitlyn E. Sutherlin

    (Department of Geography and Atmospheric Science, University of Kansas, 1475 Jayhawk Blvd., Lawrence, KS 66045, USA)

  • Nathaniel A. Brunsell

    (Department of Geography and Atmospheric Science, University of Kansas, 1475 Jayhawk Blvd., Lawrence, KS 66045, USA)

  • Gabriel de Oliveira

    (Department of Geography and Atmospheric Science, University of Kansas, 1475 Jayhawk Blvd., Lawrence, KS 66045, USA)

  • Timothy E. Crews

    (The Land Institute, 2440 East Well Rd., Salina, KS 67401, USA)

  • Lee R. DeHaan

    (The Land Institute, 2440 East Well Rd., Salina, KS 67401, USA)

  • Giulia Vico

    (Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Ulls väg 16, Uppsala 75007, Sweden)

Abstract

Perennial grain crops have been suggested as a more sustainable alternative to annual crops. Yet their water use and how they are impacted by environmental conditions have been seldom compared to those of annual crops and grasslands. Here, we identify the dominant mechanisms driving evapotranspiration (ET), and how they change with environmental conditions in a perennial Kernza crop (US-KLS), an annual crop field (US-ARM), a C 4 grassland (US-KON), and a mixed C 3 /C 4 grassland (US-KFS) in the Central US. More specifically, we have utilized the omega (Ω) decoupling factor, which reflects the dominant mechanisms responsible for the evapotranspiration (ET) of the canopy. Our results showed that the US-ARM site was the most coupled with the lowest decoupling values. We also observed differences in coupling mechanism variables, showing more sensitivity to the water fluctuation variables as opposed to the radiative flux variables. All of the sites showed their lowest Ω value in 2012, the year of the severe drought in the Central US. The 2012 results further indicate the dependence on the water fluctuation variables. This was especially true with the perennial Kernza crop, which displayed much higher soil moisture values. In this regard, we believe that the ability of perennial Kernza to resist water stress and retain higher soil moisture values is both a result of its deeper roots, in addition to its higher Ω value. Through the analysis of both the site comparison and the comparison of the differences in years, we conclude that the perennial Kernza crop (US-KLS) is more similar in its microclimate effects to the C 4 (US-KON) and mixed C 3 /C 4 (US-KFS) grassland sites as opposed to its annual counterpart (US-ARM). This has implications for the role of perennial agriculture for addressing agricultural resilience under changing climate conditions.

Suggested Citation

  • Caitlyn E. Sutherlin & Nathaniel A. Brunsell & Gabriel de Oliveira & Timothy E. Crews & Lee R. DeHaan & Giulia Vico, 2019. "Contrasting Physiological and Environmental Controls of Evapotranspiration over Kernza Perennial Crop, Annual Crops, and C 4 and Mixed C 3 /C 4 Grasslands," Sustainability, MDPI, vol. 11(6), pages 1-14, March.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:6:p:1640-:d:215036
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    References listed on IDEAS

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    1. Kirsten L. Findell & Alexis Berg & Pierre Gentine & John P. Krasting & Benjamin R. Lintner & Sergey Malyshev & Joseph A. Santanello & Elena Shevliakova, 2017. "The impact of anthropogenic land use and land cover change on regional climate extremes," Nature Communications, Nature, vol. 8(1), pages 1-10, December.
    2. Spinelli, Gerardo M. & Snyder, Richard L. & Sanden, Blake L. & Gilbert, Matthew & Shackel, Ken A., 2018. "Low and variable atmospheric coupling in irrigated Almond (Prunus dulcis) canopies indicates a limited influence of stomata on orchard evapotranspiration," Agricultural Water Management, Elsevier, vol. 196(C), pages 57-65.
    3. Marin, Fábio R. & Angelocci, Luiz R. & Nassif, Daniel S.P. & Costa, Leandro G. & Vianna, Murilo S. & Carvalho, Kassio S., 2016. "Crop coefficient changes with reference evapotranspiration for highly canopy-atmosphere coupled crops," Agricultural Water Management, Elsevier, vol. 163(C), pages 139-145.
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