Management and environmental factors associated with simulated restoration seeding barriers in sagebrush steppe

Restoration Ecology
By: , and 

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Abstract

Adverse weather conditions, particularly freezing or drought, are often associated with poor seedling establishment following restoration seeding in drylands like the Great Basin sagebrush steppe (USA). Management decisions such as planting date or seed source could improve restoration outcomes by reducing seedling exposure to weather barriers. We simulated the effects of management and environmental factors on seedling exposure to post-germination barriers for bottlebrush squirreltail (Elymus elymoides), Sandberg bluegrass (Poa secunda), and bluebunch wheatgrass (Pseudoroegneria spicata). We combined germination timing models with daily soil moisture and temperature estimates to calculate yearly germination favorability and post-germination freezing and drought barriers for three planting dates (Oct. 15, Nov. 15, and Mar. 15) and three seed sources or cultivars per species for 5000 sites in each of 40 yrs (water years 1980-2019). We tested the effects of site environmental variables (elevation, mean annual precipitation, heat load, and clay content) and management choices (seed source and planting date) on germination favorability and barrier occurrence (mean) and variability (coefficient of variation). Seedling exposure to barriers was strongly linked to management decisions in addition to site mean precipitation and elevation. Later fall plantings and seed sources with slower germination (lower mean germination favorability) were less likely to encounter freezing and drought barriers. These results suggest that management actions can play a role comparable to site environmental variables in reducing exposure of vulnerable seedlings to adverse weather conditions and subsequent effects on restoration outcomes.

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Publication type Article
Publication Subtype Journal Article
Title Management and environmental factors associated with simulated restoration seeding barriers in sagebrush steppe
Series title Restoration Ecology
DOI 10.1111/rec.13722
Edition Online First
Year Published 2022
Language English
Publisher Society for Ecological Restoration
Contributing office(s) Southwest Biological Science Center
Country United States
State California, Idaho, Nevada, Oregon, Utah, Washington
Other Geospatial Great Basin
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