Location: Great Basin Rangelands Research
Project Number: 2060-22000-025-018-A
Project Type: Cooperative Agreement
Start Date: Aug 15, 2025
End Date: Aug 14, 2026
Objective:
We will monitor field experiments to quantify effects of herbicide on native and invasive plant communities. Herbicide (imazapic) was applied at four sites in Gold Butte National Monument and Hidden Valley in 2019 by aerial application on 220 x 220 m plots with controls. Percent cover by plant species will be estimated ocularly in seven 0.5m x 0.5m quadrats per transect with three-75m transects per plot. Density of annual, native forbs will be recorded in all quadrats, and the height of the tallest annual, non-native grass and native forb within each quadrat will be measured to the nearest half centimeter. Additionally, all perennial plants will be measured in a belt transect (2m wide each side) to estimate perennial cover. Perennial annual production will be estimated with reference units that are clipped and weighed and then the number of units per plant will be counted for the following species: Larrea tridentata, Ambrosia dumosa, Krameria spp., and Pleuraphis rigida. Data will be prepared for fire risk modeling.
Tasks may include field data collection, data analysis, providing data for modeling purposes, report writing, and manuscript preparation. Deliverables may include datasets, scientific publications, and outreach materials.
Approach:
Field experments will be monitored to quantify the effects of herbicide on native and invasive plant communities. Herbicide (imazapic) was applied at four sites in Gold Butte National Monument and Hidden Valley in 2019 by aerial application on 220 x 220 m plots with controls. Percent cover by plant species will be estimated ocularly in seven 0.5m x 0.5m quadrats per transect with three-75m transects per plot. Density of annual, native forbs will be recorded in all quadrats, and the height of the tallest annual, non-native grass and native forb within each quadrat will be measured to the nearest half centimeter. Additionally, all perennial plants will be measured in a belt transect (2m wide each side) to estimate perennial cover. Perennial annual production will be estimated with reference units that are clipped and weighed and then the number of units per plant will be counted for the following species: Larrea tridentata, Ambrosia dumosa, Krameria spp., and Pleuraphis rigida. Data will be prepared for fire risk modeling.
Tasks may include field data collection, data analysis, providing data for modeling purposes, report writing, and manuscript preparation. Deliverables may include datasets, scientific publications, and outreach materials.