低蒿(Artemisia arbuscula var. arbuscula)草原规定火后的早期演替

IF 0.5 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION
J. Bates, K. Davies
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引用次数: 1

摘要

摘要本文研究了杨蒿(Artemisia arbuscula var. arbuscula, Nutt.)火后植物群落演替。俄勒冈州东南部的麦克明(矮荞属)大草原。治疗方法是“处方烧伤”(烧伤;(2012年秋季)和“未燃烧”(对照)丛竹草原,研究设计为随机完整区,每个处理4个重复。比较了不同处理(2012-2020年)的草本产量、植被冠层盖度和密度。火灾几乎消灭了丛木,燃烧后的前8年没有新植株的生长。在火灾后的大部分时间里,烧伤处理的草本产量大约是对照的两倍。在对照中,本地多年生草本植物和草本植物占总草本产量的94% ~ 96%,毛茛(Bromus tectorum L.)占0.2% ~ 2%。在烧伤处理中,多年生禾草和草本占草本总产量的83% ~ 87%,本地一年生草本占2% ~ 5%,白顶草占3% ~ 9%。尽管白杨的数量有所增加,但烧地以多年生草本和草本植物为主,表现出较高的抗逆性和抗性。在规定的火灾条件下,对于研究点和类似的丛木群落,不需要杂草控制或播种来恢复本地草本群落。然而,我们的研究结果是针对完整的丛木植物群落的低烈度规定火灾。更严重的火灾,如可能发生的野火,以及在具有更大的火灾前入侵杂草组成的丛木群落中,不应假设具有类似的高水平的群落恢复力和抵抗力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Early Succession Following Prescribed Fire in Low Sagebrush (Artemisia arbuscula var. Arbuscula) Steppe
Abstract. We evaluated plant community succession following prescribed fire on Artemisia arbuscula var. arbuscula (Nutt.) McMinn (low sagebrush) steppe in southeastern Oregon. Treatments were “prescribed burned” (burn; fall 2012) and “unburned” (control) A. arbuscula steppe, and the study design was a randomized complete block with 4 replicates per treatment. Herbaceous yield and vegetation canopy cover and density were compared between treatments (2012–2020). Fire practically eliminated A. arbuscula and there was no recruitment of new plants in the first 8 years after burning. Herbaceous yield in the burn treatment was about double the control for most of the postfire period. Native perennial grasses and forbs constituted 94% to 96% and Bromus tectorum L. (cheatgrass) 0.2% to 2% of total herbaceous yield in the control. In the burn treatment, perennial grasses and forbs constituted 83% to 87%, native annual forbs 2% to 5%, and B. tectorum 3% to 9% of total herbaceous yield. Despite an increase in B. tectorum, the burned A. arbuscula sites were dominated by herbaceous perennial grasses and forbs and exhibited high levels of resilience and resistance. After prescribed fire, for the study sites and comparable A. arbuscula associations, weed control or seeding are not necessary to recover the native herbaceous community. However, the results in our study are for low-severity prescribed fire in intact A. arbuscula plant communities. Higher-severity fire, as might occur with wildfire, and in A. arbuscula communities having greater prefire invasive weed composition should not be assumed to develop similarly high levels of community resilience and resistance.
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来源期刊
Western North American Naturalist
Western North American Naturalist 环境科学-生态学
CiteScore
0.90
自引率
16.70%
发文量
39
审稿时长
>36 weeks
期刊介绍: The Western North American Naturalist places neither restriction nor preference on manuscripts within the disciplines of the biological sciences. Each issue treats diverse taxa from the perspectives of various disciplines (e.g., ecology, population dynamics, behavior, systematics, anatomy, and physiology).
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