FIRE AND NITROGEN EFFECTS ON RED THREE-AWN COMMUNITIES IN THE NORTHERN PLAINS
Livestock and Range Research Laboratory (LARRL)
2013 Annual Report
1a.Objectives (from AD-416):
Determine effects of summer and fall fire and nitrogen addition on red three-awn communities.
1b.Approach (from AD-416):
A 3x3 factorial arrangement of fire and fertilizer treatments will be applied on 2 sites over 2 years and monitored 2years following treatment to examine effects of no fire, summer or fall fire and no nitrogen addition or addition of 40 or 80 kg/ha on red three-awn communities. Increased nitrogen availability will likely improve the ability of other species to establish and compete with red three-awn. Summer fire should be detrimental to red three-awn because of the plant's growth pattern and bunchgrass habit. Treatment effects will be evaluated by measuring standing crop, plant species composition and plant diversity before treatment and 2 years post-treatment.
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.