Riparian Revegetation Feasibility Studies

Location

Cibola National Wildlife Refuge
Tucson, Arizona

Client

Bureau of Reclamation, Lower Colorado Regional Office

Project Description

GSA restoration scientists, in conjunction with the University of Arizona, conducted a phased laboratory, greenhouse, and field study to assess the feasibility of using native tree seed for large-scale riparian revegetation.

Seed collection and treatment methods, seeding methods, seeding rates, and irrigation methods were optimized to maximize restoration success and minimize revegetation costs.

Long-term monitoring documented survival, growth, and native/non-native vegetation competition. Irrigation depth and frequency were analyzed to determine effects on vegetation composition. Study results indicated direct seeding can be a cost-effective method to enhance vegetation density and diversity for riparian restoration projects.

Project Highlights