Management Impacts on Non-Native Smooth Brome (Bromus inermis Leyss.) Control in a Native Fescue Grassland in Canada

Land Pub Date : 2024-07-26 DOI:10.3390/land13081142
Debra J. Brown, A. Dhar, M. Naeth
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Abstract

Native fescue grassland degradation and reductions in plant species diversity due to smooth brome (Bromus inermis Leyss.) invasion and dominance have far ranging consequences for both human and ecological systems. A study was undertaken to reduce smooth brome which was invading foothills fescue grassland in Canada and displacing native species. Sheep and cattle grazing, mowing, glyphosate, and burning were applied to control smooth brome-dominant grasslands over three growing seasons. Defoliation (5 to 10 cm, 2 to 4 times) did not reduce smooth brome tiller density, etiolated regrowth, or total non-structural carbohydrates; however, the three heaviest defoliation treatments (sheep 3×, cattle 3×, mowing 4×) reduced smooth brome composition by year 3. Repeated glyphosate wicking (1× year 1, 2× year 2) was the most effective treatment and reduced smooth brome tiller density by 50% by year 3. Early-spring burning, as smooth brome began to grow, stressed the plants and reduced tiller density. Kentucky bluegrass (Poa pratensis L.), the subdominant species, increased in all treatments except the reference; thus, reducing smooth brome may result in another undesirable species becoming dominant.
管理对加拿大原生羊茅草地非本地平滑锦葵(Bromus inermis Leyss.)控制的影响
由于平滑锦葵(Bromus inermis Leyss.)的入侵和支配,原生羊茅草地退化,植物物种多样性减少,对人类和生态系统都产生了深远的影响。一项研究旨在减少入侵加拿大山麓羊茅草地并取代本地物种的光滑锦葵。在三个生长季节中,采用放牧、割草、草甘膦和焚烧等方法控制以平滑锦鸡儿为主的草地。落叶(5 至 10 厘米,2 至 4 次)并没有降低平滑锦葵的分蘖密度、幼苗再生或非结构性碳水化合物总量;然而,三种最严重的落叶处理(羊 3×、牛 3×、割草 4×)在第 3 年降低了平滑锦葵的成分。重复使用草甘膦(第 1 年 1 次,第 2 年 2 次)是最有效的处理方法,到第 3 年时,平滑锦葵的分蘖密度降低了 50%。早春,当光滑绒毛草开始生长时进行焚烧,会对植物造成压力并降低分蘖密度。肯塔基蓝草(Poa pratensis L.)是次优势物种,在除参照物之外的所有处理中都有所增加;因此,减少平滑锦葵可能会导致另一种不受欢迎的物种成为优势物种。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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