Cottonwood system

Research Group

Question: Do fine root longevities and turnover rates vary among ecosystems dominated by cottonwood trees which differ genetically due to natural hybridization events?

Study Location: Weber River, Utah

Design: 24 tubes placed in a common garden environment ( among multiple natural genotypes from the Weber River artificially planted in 1991, 15 tubes each placed in a hybrid cottonwood riparian zone, and two parent dominated zones (parents: P. fremontii and P. angustifolia). Tubes were placed in the field and common garden in May of 2002.  Tubes in the field are near mature trees which may be as old as 200 years. Tubes in the common garden are near trees of known genotype which may be as large as 10 meters tall and 50 cm in diameter at the base of the live crown.