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首页> 外文学位 >The post burning response of bark beetles to prescribed burning treatments in Northern California.
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The post burning response of bark beetles to prescribed burning treatments in Northern California.

机译：北加州对树皮甲虫的烧伤后反应对处方烧伤的处理。

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摘要

Ecologists and fire scientists have recommended reintroducing fire to achieve the twin goals of restoring pre-settlement forest conditions and reducing catastrophic fire risk. Prescribed fire is seen as the management tool to help remediate the current problems of poor forest health and extensive high-risk fire behavior characteristics. The accelerated use of prescribed fire in California ecosystems may or may not alleviate these conditions. An increased comprehension of fire-insect interactions is necessary for more effective science based management of forest ecosystems.; Fire may increase the risk of tree mortality from bark beetles by compromising tree defenses against them. Early work by forest entomologists established a direct relationship between fire injury and subsequent insect attack in burned-over areas. Prescribed fires are likely to have a different insect response due to lower fire intensities than wildfires. Fall and spring burns are also likely to have differential effects on trees due to contrasting physiological activity and carbohydrate storage as well as different fuel moisture and resultant fuel consumption levels. This research is designed to test these differences and provide managers with a better understanding of fire-insect interactions with using prescribed burns in Northern California.; This dissertation investigates fall and spring prescribed burns and their role in predisposing trees to bark beetle attack in Northern California. A study of the effects of seasonal understory prescribed burns under a wide variety of stand conditions was conducted during the 1997–2001 time period. Special attention was given to the role of fire in predisposing trees to beetle attack and the effect of fire on the vigor of an individual tree.; Initial concern has centered on the primary tree killers Dendroctonus spp. and Scolytus ventralis Leconte. This research is also finding that Dendroctonus valens, Ips pini, and secondary wood borers are strong contributors to tree mortality with both fall and spring prescribed burns. Phloesinus spp. has been found contributing to small diameter Incense cedar mortality following fall burns. Delayed mortality from bark beetles has been found in both Jeffrey and ponderosa pine up to four years after the initial disturbance. Post-burning bark beetle induced mortality can be quite significant and needs to be managed with the creation of guidelines for estimating the survival of fire damaged trees. The management implications of post-burning bark beetle response are discussed as well as the potential impact of this response on stand dynamics.
机译：生态学家和火灾科学家建议重新引入火灾，以实现恢复定居前森林状况和降低灾难性火灾风险的双重目标。规定的火灾被视为有助于补救当前森林健康差和高风险火灾行为特征的当前问题的管理工具。在加利福尼亚州生态系统中加速使用规定的火种可能会缓解也可能不会缓解这些情况。为了更有效地以科学为基础的森林生态系统管理，必须增强对火-虫相互作用的理解。着火可能会损害树皮对它们的防御能力，从而增加树皮甲虫致死的风险。森林昆虫学家的早期工作建立了火灾和烧毁地区随后的昆虫袭击之间的直接关系。由于火势比野火低，因此规定的火可能具有不同的昆虫反应。由于生理活动和碳水化合物的储存情况不同，燃料水分和燃料消耗水平不同，秋季和春季的烧伤也可能对树木产生不同的影响。本研究旨在测试这些差异，并通过在北加利福尼亚使用规定的烧伤方法，使管理人员更好地了解火虫相互作用。本文研究了北加州秋季和春季规定的烧伤及其在诱使树木遭受树皮甲虫侵袭中的作用。在1997-2001年期间，进行了在各种林分条件下季节性林下规定烧伤的影响的研究。特别注意了火在使树木更容易受到甲虫侵袭中的作用以及火对单株树木活力的影响。最初的关注焦点是主要的树木杀手 Dendroctonus spp。和 Scolytus ventralis Leconte。这项研究还发现， Dendroctonus valens，Ips pini 和次生木蛀虫是造成秋季和春季规定烧伤的树木死亡率的重要因素。已经发现 Phloesinus spp。有助于秋季烧伤后小直径香柏的死亡。在最初的干扰后长达四年的时间里，在杰弗里和黄松中都发现了树皮甲虫的延迟死亡。燃烧后的树皮甲虫引起的死亡率可能是相当高的，需要通过创建评估火灾受损树木的生存准则来进行管理。讨论了烧后树皮甲虫反应的管理意义以及该反应对林分动态的潜在影响。

著录项

  • 作者

    Ganz, David Jerome.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Agriculture Forestry and Wildlife.; Biology Entomology.; Biology Ecology.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 191 p.
  • 总页数 191
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 森林生物学;昆虫学;生态学（生物生态学）;
  • 关键词

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