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Allometric equations for the invasive vine air potato (Dioscorea bulbifera) in its exotic range in Florida

Published online by Cambridge University Press:  14 May 2020

Min B. Rayamajhi Open the ORCID record for Min B. Rayamajhi [Opens in a new window] ,
Eric Rohrig ,
Philip W. Tipping ,
Paul D. Pratt  and
Jorge G. Leidi
Min B. Rayamajhi*
Affiliation:
Research Plant Pathologist, USDA–ARS, Invasive Plant Research Laboratory, Fort Lauderdale, FL, USA
Eric Rohrig
Affiliation:
Methods Development and Biological Control, Florida Department of Agriculture, Gainesville, FL, USA
Philip W. Tipping
Affiliation:
Research Entomologist, USDA–ARS, Invasive Plant Research Laboratory, Fort Lauderdale, FL, USA
Paul D. Pratt
Affiliation:
Research Entomologist, USDA–ARS–WRRC, Albany, CA, USA
Jorge G. Leidi
Affiliation:
Biological Research Technician, USDA–ARS, Invasive Plant Research Laboratory, Fort Lauderdale, FL, USA
*
Author for correspondence: Min B. Rayamajhi, USDA/ARS, Invasive Plant Research Laboratory, Fort Lauderdale, FL33314. (Email: Min.Rayamajhi@usda.gov)
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Abstract

Nondestructive means for estimating air potato (also known as air yam; Dioscorea bulbifera L.) biomass will help gauge its management efficacy over time. We developed allometric equations to estimate total and fractional biomass components and densities of aerial bulbils and underground tubers of field-grown D. bulbifera in Florida. We selected four naturally infested sites representing its southern, central, and northern distribution in Florida and measured three independent variables (vine densities, stem diameters, and top heights) of 84 (21 site−1) discrete D. bulbifera patches during late October to early December of 2012. We destructively harvested D. bulbifera biomass, sorted by tubers, stems, leaves, and bulbils; counted units of bulbils and underground tubers (dependent variables); and dried to a constant weight. Mean percentages of tuber, stem, leaf, and bulbil fractions in total biomass were 42.0, 15.6, 26.0, and 16.4, respectively. We developed a parameterized multiplicative prediction model and regression equation for each dependent variable. Slopes of relationships among independent and dependent variables varied by biomass and density (bulbil and tuber) of plant components. Multiplied values of independent variables: all three for total, tuber, stem, and leaf biomass; two (vine base diameter*patch height) for bulbil biomass; two (vine density*patch height) for bulbil density; and only one (stem density) for tuber density provided best (R2-based) prediction values. These models will provide nondestructive methods for estimating biomass components and density of vegetative propagules of naturally growing D. bulbifera. Models are critical for understanding the performance of D. bulbifera in its exotic range, estimating biomass to project control costs, and comparing biomass components and bulbil/tuber densities during pre- and postmanagement periods to gauge control efficacy.

Keywords

Above- and belowground componentsbiomass prediction equationsbulbilsexotic vinespredictive modelstubers
Type
Research Article
Information
Invasive Plant Science and Management , Volume 13 , Issue 2 , June 2020 , pp. 76 - 83
Creative Commons
Creative Common License - CCCreative Common License - BY
This is a work of the U.S. Government and is not subject to copyright protection in the United States.
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Darren J. Kriticos, CSIRO Ecosystem Sciences

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