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United States Department of Agriculture

Agricultural Research Service


Location: Range and Livestock Research

2013 Annual Report

1a. Objectives (from AD-416):
Provide BLM with a decision matrix to be utilized in selecting treatment protocol to increase native diversity in three-awn dominated plant communities.

1b. Approach (from AD-416):
Examine the effects of fire and nitrogen addition on three-awn dominated communities. Increased nitrogen availability will likely improve the ability of other species to establish and compete with three-awn. Late growing season fire should be detrimental to red three-awn because of the plant's growth pattern and bunchgrass habit. Treatments will be combinations of fire vs. no fire and nitrogen addition vs. no nitrogen addition and assigned in a completely randomized design with factorial arrangement and replicated 5 times. Treatment effects will be evaluated by measuring standing crop, plant species composition and plant diversity before treatment and 2 years post-treatment.

3. Progress Report:
Data have been reported for fire and nitrogen effects on the plant community and threeawn forage quality, and fire heat dosage effects on threeawn mortality. Data collected was extended and completed for an additional year to assess longer-term resilience of the plant community. Data for additional sampling are being processed. As ADODR, communications have been daily through personal contact, phone and e-mail with graduate students. Weekly planning meetings were conducted.

4. Accomplishments

Last Modified: 05/25/2017
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