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首页> 外文期刊>Journal of arid environments >Postfire shrub cover dynamics: A 70-year fire chronosequence in mountain big sagebrush communities
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Postfire shrub cover dynamics: A 70-year fire chronosequence in mountain big sagebrush communities

机译：火灾后灌木覆盖的动态：山区大型鼠尾草群落中70年火灾的时序

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摘要

Fire is natural in sagebrush (Artemisia L.) communities. In this study, we quantify effects of time since last burn (TSLB) on shrub cover over a 70-year (yr) fire chronosequence. We sampled mountain big sagebrush communities with very large-scale aerial (VLSA) imagery and measured sagebrush, antelope bitterbrush (Purshia tridentata [Pursh] DC.), and spineless horsebrush (Tetradymia canescens DC.) cover. We used segmented regression to describe two cover phases with respect to TSLB. Phase 1 was when cover responded to TSLB and Phase 2 was when cover had reached a steady state with respect to TSLB meaning that expected shrub cover did not change with increasing TSLB. In the first year after burning, total shrub cover was 5%. In Phase 1, total shrub, sagebrush, and bitterbrush cover increased with TSLB. Bitterbrush transitioned to Phase 2 in 6 yr, but 19 and 18 yr, respectively, were needed for sagebrush and total shrub to transition. Horsebrush cover decreased with TSLB from 2.1% to 0.2% over 27 yr. Steady-state cover for sagebrush, bitterbrush, and total shrub were 30.6, 2.8, and 39.8%, respectively. These data describe postfire shrub cover change in mountain big sagebrush communities that can be used in management plans that meet shrub cover objectives. (C) 2014 The Authors. Published by Elsevier Ltd.
机译：在鼠尾草（Artemisia L.）社区，火是自然的。在这项研究中，我们量化了自上次烧伤以来的时间（TSLB）对70年（年）火灾时序的灌木覆盖率的影响。我们对具有大型航空（VLSA）图像的山区大型鼠尾草进行了采样，并测量了鼠尾草，羚羊苦瓜（Purshia tridentata [Pursh] DC。）和无脊椎的马鞭草（Tetradymia canescens DC。）的覆盖范围。我们使用分段回归来描述关于TSLB的两个覆盖阶段。第一阶段是覆盖物对TSLB的响应，第二阶段是覆盖物相对于TSLB的稳定状态，这意味着预期的灌木覆盖率不会随着TSLB的增加而变化。燃烧后的第一年，灌木总覆盖率为5％。在阶段1中，TSLB增加了灌木，鼠尾草和苦草的覆盖率。苦瓜在6年内过渡到了第二阶段，但分别需要19和18年才能使鼠尾草和总灌木过渡。在过去的27年中，TSLB的马刷覆盖率从2.1％降低至0.2％。鼠尾草，苦草和总灌木的稳态覆盖率分别为30.6、2.8和39.8％。这些数据描述了山区大型鼠尾草群落火灾后灌木覆盖度的变化，这些变化可用于满足灌木覆盖度目标的管理计划中。 （C）2014作者。由Elsevier Ltd.发布

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