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Environmental Factors Influence Early Population Growth of Japanese Stiltgrass (Microstegium vimineum)

Published online by Cambridge University Press:  20 January 2017

Andrea N. Nord ,
David A. Mortensen  and
Emily S. J. Rauschert
Andrea N. Nord*
Affiliation:
Department of Crop and Soil Sciences and Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, 116 Agricultural Sciences and Industries Building, University Park, PA 16823
David A. Mortensen
Affiliation:
Department of Crop and Soil Sciences and Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, 116 Agricultural Sciences and Industries Building, University Park, PA 16823
Emily S. J. Rauschert
Affiliation:
Department of Crop and Soil Sciences and Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, 116 Agricultural Sciences and Industries Building, University Park, PA 16823
*
Corresponding author's E-mail: [email protected]
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Abstract

Habitat suitability and disturbance can shape the early stages of biological invasions in important ways. Much that we know about habitat suitability and invasion originates from point-in-time studies, which characterize invasive plant abundance and associated site characteristics. In our study, we tested the influence of habitat suitability by creating small-scale invasions in a range of environments. Seeds of the invasive annual grass Japanese stiltgrass [Microstegium vimineum (Trin.) A. Camus] were planted into six environments in a deciduous forest in central Pennsylvania, and patch growth was monitored for 4 yr. Each of the 30 sites included a subplot subjected to litter disturbance at time of planting. This litter disturbance led to increased seedling recruitment only in the first 2 yr. Although patches were generally larger in wetland and roadside habitats, site influence was highly variable. Environmental variables (soil moisture, ammonium–N, pH, and plant species richness) measured in each plot were better predictors of population success than broad habitat categories. We conclude that risk assessment for species such as M. vimineum should focus not on habitat types but on areas likely to experience the physical changes that release M. vimineum populations.

Keywords

Japanese stiltgrass, Microstegium vimineum (Trin.) A. Camus (Poaceae)Invasibilityinvasion successhabitat suitabilitydisturbancesoil pH
Type
Research
Information
Invasive Plant Science and Management , Volume 3 , Issue 1 , May 2010 , pp. 17 - 25
Copyright
Copyright © Weed Science Society of America 

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