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首页> 外文学位 >Ecological responses of two forest understory herbs to changes in resources caused by prescribed fire alone or in combination with restoration thinning.
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Ecological responses of two forest understory herbs to changes in resources caused by prescribed fire alone or in combination with restoration thinning.

机译：两种森林林下草药对单独开处方火或与恢复间伐相结合引起的资源变化的生态响应。

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摘要

The oak-rich deciduous forests of the central Appalachian Mountains of eastern North America have changed significantly since the onset of effective fire suppression early in the 20th century. Recently dormant season fire and alteration of the woody plant assemblage have been used in these ecosystems for forest management and restoration. These manipulations often increase light, soil temperature and moisture, and alter short and longer-term nutrient availability. Therefore, the ability of herbaceous plants to survive, reproduce, and establish in these different environments depends on their exhibiting an integrated ecological response. By examining the morphology, physiology, nutrient and reproduction traits of two long-lived understory herbaceous perennials Desmodium nudiflorum (L.) DC and Panicum boscii Gould & CA Clark in the mixed oak forests in southern Ohio, this study aimed to understand the integrated ecological responses of these forest herbs to prescribed burning alone and the combination of burning and thinning, and to reveal the environmental drivers important in shaping plant ecological traits.; The study sites were part of larger Ohio Hills Site of the National Fire and Fire Surrogate Network Study. The original experiment design has randomly assigned control (C), burn (B), thin (T), and thin+burn (T+B) units of 20-30 ha each in three areas of southern Ohio. The T and T+B units were thinned during late fall 2000 and early spring 2001, and the burn and thin+burn units burned in early April 2001 and again in March 2005. I examined ecological traits of the two herbaceous perennials from three treatment units (control, burn, thin+burn) in two of the study sites during 2004 and 2005.; Among the ecological traits measured, specific leaf area (SLA), plant biomass, maximum photosynthesis rate (Amax), leaf area ratio, number of seeds, and leaf nutrient concentrations showed the largest responses to these silvicultural treatments; while leaf nutrient resorption efficiency showed the least response. Desmodium nudiflorum was more responsive to the altered resource conditions following forest manipulation activities than Panicum boscii. However, in both herbs, the ecological responses to different treatments became less pronounced with time after fire.; During the short-term after fire, understory light availability and soil nutrient availability are the most important environmental drivers in shaping the integrated ecological traits of D. nudiflorum. With time since fire, soil nutrient availability becomes less important, while topographical/soil moisture conditions, soil exposure, and light availability act in concert as the most important environmental drivers for the ecological traits of D. nudiflorum.
机译：自20世纪初期有效灭火以来，北美东部阿巴拉契亚山脉中部盛产橡木的落叶林发生了巨大变化。最近在这些生态系统中使用了休眠季节的大火和木本植物组合的改变来进行森​​林管理和恢复。这些操作通常会增加光照，土壤温度和湿度，并改变短期和长期的养分利用率。因此，草本植物在这些不同环境中生存，繁殖和建立的能力取决于它们表现出的综合生态反应。通过研究俄亥俄州南部混合橡树林中两个长寿的地下草本多年生植物多年生Desmodium nudiflorum（L.）DC和Panicum boscii Gould＆CA Clark的形态，生理，营养和繁殖特性，本研究旨在了解综合生态系统。这些森林草药对单独燃烧以及燃烧和间伐的组合的反应，并揭示出对塑造植物生态特性至关重要的环境驱动因素。研究地点是美国国家火灾和火灾代理网络研究的俄亥俄山遗址的一部分。原始实验设计在俄亥俄州南部的三个地区随机分配了20-30公顷的控制（C），燃烧（B），稀薄（T）和稀薄+燃烧（T + B）单位。 T和T + B单元在2000年秋末和2001年初春间被减薄，烧伤和Thin + Burn烧伤单元在2001年4月上旬和2005年3月再次被烧掉。 （控制，燃烧，稀薄+燃烧）在2004年和2005年的两个研究地点进行；在测得的生态特征中，比叶面积（SLA），植物生物量，最大光合作用率（Amax），叶面积比，种子数和叶养分浓度显示出对这些造林处理的最大响应；叶片养分吸收效率显示出最小的响应。在森林操作后，地衣藻对变种资源条件的反应比百日草更敏感。然而，在两种草药中，不同处理对生态的反应随着火后的时间变得不那么明显。在火灾后的短期内，林下光的利用和土壤养分的利用是塑造D. nudiflorum综合生态特性的最重要的环境驱动因素。自火灾以来，随着时间的推移，土壤养分的可用性变得不那么重要了，而地形/土壤湿度条件，土壤暴露和光的可用性共同构成了杜鹃花生态特性的最重要环境​​驱动因素。

著录项

  • 作者

    Huang, Jianjun.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Biology Botany.; Biology Ecology.; Agriculture Forestry and Wildlife.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 191 p.
  • 总页数 191
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;生态学（生物生态学）;森林生物学;
  • 关键词

  • 入库时间 2022-08-17 11:39:18

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