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LTER Cross-Site: Contrasts of Global Change and Ecotonal Shifts: Buffering Effects of Mycorrhizae and Nurse Plants and Increased Sensitivity due to Herbivores and Mistletoe

LTER Cross-Site: Contrasts of Global Change and Ecotonal Shifts: Buffering Effects of Mycorrhizae and Nurse Plants and Increased Sensitivity due to Herbivores and Mistletoe
LTER 跨站点:全球变化和生态转移的对比:菌根和护士植物的缓冲作用以及食草动物和槲寄生引起的敏感性增加
批准号:
0087017
负责人:
Catherine Gehring
金额:
$30.0万
依托单位:
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
2000
资助国家:
美国
项目状态:
已结题
起止时间:
2000-10-01 至 2004-09-30

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中文摘要
翻译
[0087017] gehring全球变化模型预测,美国大陆内陆发生强烈干旱的频率将增加,最近的实地研究表明,半干旱生态系统对这种非生物胁迫可能高度敏感。例如,在20世纪50年代,新墨西哥州的严重干旱导致树木死亡率很高,在不到五年的时间里,过渡带移动了2公里。快速、持续的生态转移取决于以下几个过程:生态系统中一种或多种优势植物物种的高死亡率,以及在死亡事件发生后优势植物物种缺乏补充。这项LTER跨站点研究将检验生态转移发生的概率取决于非生物胁迫的程度,以及积极和消极生物关联对优势植物物种的相对影响的假设。积极的联系,如菌根联系和护理植物,可以缓冲群落免受主要生态转移的影响,而与食草动物和寄生虫的消极联系可以增加对全球变化的敏感性。这项研究将重点关注生长在新墨西哥州和亚利桑那州分布的南部边缘的小松。Pinyon是全球变化研究的理想候选者,因为它是北美第三大植被类型的主要成员。古生态学和最近的研究表明,松树对环境变化非常敏感。人们对小松及其相关群落之间的相互作用了解甚多,包括其共同优势的树同伴和密切生活在一起的细菌、真菌、无脊椎动物和脊椎动物。这种更广泛的相互作用的知识将使我们能够更准确地预测小松死亡率对群落其他成员和生态系统过程的影响。
英文摘要
0087017Gehring Global change models predict an increase in the frequency of intense drought in the continental interior of the US, and recent field studies have shown that semiarid ecosystems can be highly sensitive to this type of abiotic stress. For example, in the 1950's a severe drought in New Mexico resulted in high tree mortality that shifted ecotones by 2 kilometers in less than five years. Rapid, sustained ecotonal shifts depend on to processes: high rates of mortality of one or more of the dominant plant species in the ecosystem, and lack of recruitment of the dominant plant species following the mortality event. This LTER cross-site research will test the hypothesis that the probability that an ecotonal shift will occur depends on the degree of abiotic stress, and on the relative effects of positive and negative biotic associations on the dominant plant species. Positive associations, such as mycorrhizal associations and nurse plants, could buffer communities from major ecotonal shifts while negative associations with herbivores and parasites could increase sensitivity to global change. This study will focus on pinyon pine growing at the southern edge of their distribution in New Mexico and Arizona. Pinyon is an ideal candidate for global change studies because it is a dominant member of the third largest vegetation type in North America. Both paleoecological and recent studies show that pinyon is highly sensitive to environmental change. Much is known about the interactions among pinyon pine and its associated community, including is co-dominant tree associate and the bacteria, fungi, invertebrates and vertebrates that live in close association. This knowledge of broader interactions will allow a more accurate prediction of the effects of pinyon mortality on other members of the community and on ecosystem processes.
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会议论文
Collaborative Research: Effects of Genetic Diversity, Epigenetic Change, and Root-associated Fungal Colonization on Trait Variation in the Foundation plant Spartina alterniflora
  • 批准号:
    1556087
  • 项目类别:
    Standard Grant
  • 资助金额:
    $9.67万
  • 财政年份:
    2016
  • 负责人:
    Catherine Gehring
  • 依托单位:
DISSERTATION RESEARCH: Fungal endophytes and tree genetics: uncovering hidden fungal diversity and estimation of biomass allocation to fungal symbionts
  • 批准号:
    1110728
  • 项目类别:
    Standard Grant
  • 资助金额:
    $1.43万
  • 财政年份:
    2011
  • 负责人:
    Catherine Gehring
  • 依托单位:
DDIG: Controls on post-wildfire carbon accumulation and release patterns
  • 批准号:
    1011415
  • 项目类别:
    Standard Grant
  • 资助金额:
    $1.4万
  • 财政年份:
    2010
  • 负责人:
    Catherine Gehring
  • 依托单位:
Climate change as an agent of selection that alters fundamental interactions among a foundation tree species and its herbivore, mutualist and competitor communities
  • 批准号:
    0816675
  • 项目类别:
    Continuing Grant
  • 资助金额:
    $61.0万
  • 财政年份:
    2008
  • 负责人:
    Catherine Gehring
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国内基金
海外基金
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  • 批准号:
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  • 项目类别:
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  • 资助金额:
    --
  • 批准年份:
    2025
  • 负责人:
  • 依托单位:
基于NLRP3炎性小体与自噬Cross-talk探讨心康冲剂干预心肌纤维化的机制研究
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  • 批准号:
    JCZRYB202500379
  • 项目类别:
    省市级项目
  • 资助金额:
    --
  • 批准年份:
    2025
  • 负责人:
  • 依托单位: