Unable to connect to database - 12:11:25 Unable to connect to database - 12:11:25 SQL Statement is null or not a SELECT - 12:11:25 SQL Statement is null or not a DELETE - 12:11:25 Botany & Plant Biology 2007 - Abstract Search
Unable to connect to database - 12:11:25 Unable to connect to database - 12:11:25 SQL Statement is null or not a SELECT - 12:11:25

Abstract Detail


Ecological Section

Watrud, Lidia S. [1], King, George A. [2], Bollman, Mike [2], Storm, Marjorie [2].

Characterization of Agrostis spp. habitat in Central Oregon.

Creeping bentgrass, Agrostis stolonifera L., is a non-native grass commonly found at mesic sites in central Oregon. Interest in A. stolonifera plant communities and the factors that may control its distribution has increased since field trials of A. stolonifera engineered to be resistant to glyphosate herbicide were conducted in Central Oregon in 2003. Our earlier studies documented long-distance (multi-km) movement of viable pollen from transgenic bentgrass fields to compatible naturalized Agrostis spp. (Watrud et al. 2004) and the establishment of transgenic A. stolonifera plants in non-agronomic habitats (Reichman et al. 2006). Herein, we report the results of autecological studies of Agrostis spp. in central Oregon. We employed a stratified sample design to collect vegetation and soil chemistry data in four plot types (Agrostis gigantea, Agrostis stolonifera, non-Agrostis and transgenic Agrostis) in six habitat types where Agrostis, typically occurs in the study area. Four quadrats (50 x 100 cm) were placed along each of 3 linear 15m transects located 3 m apart and parallel to the long axis of the most proximal water course or topographic low point (e.g., irrigation canal, creek, roadside ditch). Surveys of sixty-two plots indicated that Agrostis spp. often occur in wetland plant communities that have a high proportion of alien species (56-67%) e.g., Bromus tectorum, Phalaris arundinacea, and Lolium arundinaceum. Canonical Correspondence Analysis (CCA) indicates that plant community composition is most strongly related to soil moisture and iron concentration along axis 1 (cumulative % variance = 17%), and copper and total carbon along axis 2 (cumulative % variance = 15%). Agrostis stolonifera cover is strongly related to soil moisture; the competitive ruderal species occurs over a wide range of soil conditions (e.g., pH 6.1-8.7, Fe 17-258 ppm).


Log in to add this item to your schedule

1 - US Environmental Protection Agency, Western Ecology Division, 200 SW 35th Street, Corvallis, Oregon, 97333, USA
2 - Dynamac Corporation, U.S. EPA, Western Ecology Division, 200 SW 35th Street, Corvallis, OR, 97333, USA

Keywords:
Agrostis stolonifera
autecology
central Oregon
CP4 EPSPS transgene
soil characteristics.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P49028
Abstract ID:1514


Copyright 2000-2007, Botanical Society of America. All rights