Germination of Seeds of Fremont Cottonwood

James A. Young, Charlie D. Clements
2003 Journal of range management  
Fremont cottonwood (Populus fremontii S. Watson) is the most important cottonwood species of the southwestern United States. It is usually found in riparian areas of desert riverine systems. Often it is the only tree species in such environments. Lack of Fremont cottonwood seedling recruitment is of concern in many areas. This is especially an issue in river systems infested with the exotic saltceder (Tamarix ramosissima Ledeb.). The proposed suppression of saltceder with a biological control
more » ... iological control agent, raises the question of the spontaneous recruitment of Fremont cottonwood seedlings if competition is reduced from exotic woody species. Several studies have stressed that geomorphologic-hydrologic conditions in riparian habitats control safesites for Fremont and other cottonwood species seed germination and seedling establishment. Our purpose was to investigate the physiological amplitude for Fremont cottonwood seeds to germinate under a wide range of constant or alternating temperatures. Immediately after
doi:10.2307/4003943 fatcat:biuquq354bc6pg4m6dt5ncdwoa