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This article in AJ

  1. Vol. 102 No. 2, p. 513-522
     
    Received: Feb 10, 2009


    * Corresponding author(s): johns510@umn.edu
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doi:10.2134/agronj2009.0058

The Effect of Landscape Position on Biomass Crop Yield

  1. Ryan Thelemanna,
  2. Gregg Johnson *a,
  3. Craig Sheaffera,
  4. Sudipto Banerjeeb,
  5. Haowen Caib and
  6. Donald Wysea
  1. a Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 1991 Upper Buford Cir., St. Paul, MN 55198
    b Univ. of Minnesota, Division of Biostatistics, School of Public Health, Mayo Mail Code 303, Minneapolis, MN 55455

Abstract

Integrating annual and perennial crops at the field scale creates new opportunities for increasing financial return while addressing important environmental and ecological issues. An understanding of biomass productivity on specific landscape positions is essential to realizing this goal. The objective of this research was to determine the effect of landscape position on the productivity of herbaceous and woody biomass crops. Alfalfa (Medicago sativa L.), corn (Zea mays L.), willow (Salix spp.), cottonwood (Populus deltoides W. Bartram ex Marshall), poplar (Populus maximowiczii × P. nigra), and switchgrass (Panicum virgatum) were planted on seven landscape positions. Soil attributes were measured and included soil nitrogen, P, K, and profile darkness index (PDI). Terrain attributes included specific catchment area (SpecCat) and compound terrain index (CTI). A hierarchical Bayesian approach was used to analyze spatial data. Corn grain and stover yield was lowest in depositional and flat areas that retain water for longer periods of time and highest on well drained summit positions. Corn stover yield was positively correlated to nitrogen, PDI, SpecCat, and CTI, whereas corn grain yield was not correlated to any of the soil or terrain attributes tested. Conversely, willow productivity was among the highest at the depositional position and lowest at the summit position. For SX67 willow, growth was positively correlated to SpecCat, whereas 9882 willow growth was negatively correlated to PDI and CTI. Alfalfa and poplar productivity was highest at a site characterized by a relatively steep slope with potentially erosive soils.

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Copyright © 2010. American Society of AgronomyCopyright © 2010 by the American Society of Agronomy