Widespread invasive annual grasses, cheatgrass (Bromus tectorum L.) and Japanese brome (Bromus japonicus Thunb.), fluctuate greatly in abundance and compete with native species. Fire and herbicide have each provided various levels of short-term control. We tested the individual and combined effects of fall fire and the herbicide aminopyralid on annual brome to determine whether combined treatment increased or extended control. Treatments were a factorial arrangement of two fire (no fire; fall fire with 2-yr return interval) and three herbicide (no herbicide; alternate-yr herbicide; annual herbicide) treatments with five replications. Across years, fire doubled bare ground and reduced litter cover to half of that with no fire. Fire had no effect on germination of brome seed produced after fire. Fire reduced brome biomass one or two growing seasons after fire. The first 3 study yr, brome biomass was < 29 kg·ha⁻¹ with fire and was 132 kg·ha⁻¹ without fire. During the final year, brome biomass increased and was similar (704 kg·ha⁻¹) across fire treatments. Nonbrome biomass was 19% greater with fire during 2015 and 2018. Nonburned plots shifted from dominance by C₃ perennial grass to dominance by bromes by the last year. C₃ perennial grass maintained dominance through 2017 with fire and was codominant with bromes during 2018. Aminopyralid reduced brome germination each year it was applied but did not affect brome biomass. C₃ perennial grass dominated in both herbicide treatments through 2017. During 2018, bromes dominated with no herbicide or alternate-yr herbicide and were codominant with C₃ perennial grass with annual herbicide treatment. All treatment combinations reduced forbs compared with nonburned, no-herbicide treatment. Long-term control of annual bromes requires long-term commitment to repeated treatment. The combination of fall fire and spring application of aminopyralid did not extend annual brome control under the study conditions.

一年生广泛入侵的草，白茅草（Bromus tectorum L.）和日本锦鸡（Bromus japonicus）（Thunb。），其波动幅度很大，并与本地物种竞争。火和除草剂分别提供了不同程度的短期控制。我们测试了秋火和除草剂氨基吡咯烷对一年生溴的个体和联合作用，以确定联合治疗是否增加或扩大了控制范围。处理方法是两次分解（无火灾；以2年返回间隔的秋天火灾）和三种除草剂（无除草剂；交替除草剂；一年生除草剂）处理的析因布置，重复五次。多年以来，火灾使裸露的土地翻了一番，垃圾覆盖量减少了一半，无火。火对火后产生的溴代种子发芽没有影响。火灾在火灾后一两个生长季节减少了溴生物量。前三年研究中，溴代生物量<29 kg·ha ^-1有火，无火时为132 kg·ha ^-1。在最后一年中，整个火处理期间，溴生物量增加，并且相似（704 kg·ha ^-1）。在2015年和2018年，非溴植物生物量因火灾而增加了19％。未燃烧的土地从去年的C ₃多年生草的优势转移到了由溴的优势。到2017年，C ₃多年生禾草在火中一直保持主导地位，在2018年主要与溴有关。氨基吡喃酮每年施用时减少了溴的发芽，但不影响溴的生物量。到2017年，C ₃多年生草在两种除草剂处理中均占主导地位。2018年，溴不占主导地位，而除草剂或隔年除草剂均占主导地位，而C ₃占主导地位。多年生草，每年用除草剂处理。与未燃烧，未使用除草剂的治疗相比，所有治疗组合均减少了前肢。长期控制一年生溴需要长期致力于重复治疗。在研究条件下，秋火和氨基吡啶的春季施用相结合并没有延长年度溴的控制。