Desertification, Soil Nitrogen Mineralization, and the Fractal Nature of Soil Spatial Variation in J. Occidentalis Communities of Central Oregon (Ecosystem Studies): VPW

俄勒冈州中部 J. Occidentalis 社区的荒漠化、土壤氮矿化和土壤空间变化的分形性质(生态系统研究):VPW

基本信息

  • 批准号:
    9103615
  • 负责人:
  • 金额:
    $ 10万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    1991
  • 资助国家:
    美国
  • 起止时间:
    1991-07-01 至 1992-12-31
  • 项目状态:
    已结题

项目摘要

The proposed research tests three hypotheses relating decertification to changes in the fractal nature of soil properties and to soil food webs in big sagebrush/bluebunch wheatgrass communities in central Oregon which are grazed and being invaded by Juniperus occidentalis subsp. occidentalis. The hypotheses will be tested by sampling soils in two sites, with and without J. occidentalis, according to a fractal sampling design; analyzing samples for organic carbon, total nitrogen, moisture content, pH, soil fauna, and nitrogen mineralization rates; calculating the fractal dimension of the data by fitting straight lines to log-log semivariograms; and comparing the shapes of the semivariograms and their fractal dimensions between the sites. The research is significant because it tests a hypothesis developed in deserts of the southwest U.S. stating that decertification may occur as invasion of wood plants in grassland ecosystems as the result of grazing, which increases the spatial heterogeneity of soil water and nutrients, but recognizes the fractal nature of soil spatial variation, i.e. that they have self-affinity and detail as a wide range of spatial scales, and attempts to relate the patterns of variation to the structure of soil food webs. The results of this research will contribute to understanding of geographical and ecological processes affecting the long term use of semi-arid ecosystems. The project furthers VPW program objectives to provide opportunities for women to advance their careers in science or engineering through research, and to encourage other women to pursue careers in these areas through the investigators' enhanced visibility as role models on the host campuses. In this project, the proposed activities which contribute to the second objective include: teaching a course entitled, "Soil spatial Variability and Forest Ecology;" leading reading and discussion groups; advising; and organizing a series of guest seminars to be presented by women scientists working in fields related to the subject of soil spatial variability and forest ecology.
本研究对俄勒冈中部大山艾草/蓝束麦草群落土壤分形特性变化和土壤食物网的三个假说进行了验证,这些群落被西方杜松子种放牧和入侵。occidentalis。根据分形采样设计,这些假设将通过在两个地点取样土壤来检验,有和没有西方蓟;分析样品的有机碳、总氮、水分含量、pH值、土壤动物和氮矿化率;将直线拟合到对数-对数半变异函数中计算数据的分形维数;并比较了站点间半变分函数的形状及其分形维数。这项研究意义重大,因为它验证了在美国西南部沙漠中发展起来的一个假设,即放牧可能导致草原生态系统中的木本植物入侵,从而增加了土壤水分和养分的空间异质性,但认识到土壤空间变化的分形性质。也就是说,它们具有自亲和性和广泛的空间尺度的细节,并试图将变化模式与土壤食物网的结构联系起来。本研究结果将有助于了解影响半干旱生态系统长期利用的地理和生态过程。该项目进一步推进了VPW项目的目标,即通过研究为女性提供在科学或工程领域发展的机会,并通过研究人员在东道国校园中作为榜样的知名度提高,鼓励其他女性在这些领域追求职业。在这个项目中,有助于实现第二个目标的拟议活动包括:教授题为“土壤空间变异性和森林生态学”的课程;领导阅读和讨论小组;建议;并组织一系列由在土壤空间变异和森林生态学相关领域工作的女科学家主持的客座研讨会。

项目成果

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Julia Jones其他文献

The demography of nurses and patients on acute psychiatric wards in England.
英国急性精神科病房护士和患者的人口统计。
  • DOI:
    10.1111/j.1365-2702.2008.02362.x
  • 发表时间:
    2008
  • 期刊:
  • 影响因子:
    4.2
  • 作者:
    L. Bowers;Julia Jones;A. Simpson
  • 通讯作者:
    A. Simpson
More experiments may help explore what works in conservation
更多实验可能有助于探索保护中有效的方法
Small molecule tools for molecular recognition of tau fibril conformations
  • DOI:
    10.1016/j.bpj.2022.11.2553
  • 发表时间:
    2023-02-10
  • 期刊:
  • 影响因子:
  • 作者:
    Emma Carroll;Kelly Montgomery;Taia Wu;Julia Jones;Jason E. Gestwicki
  • 通讯作者:
    Jason E. Gestwicki
Childhood autism in the UK and Greece: a cross-national study of progress in different intervention contexts
英国和希腊的儿童自闭症:不同干预背景下进展的跨国研究
2020 Peripheral Nerve Society Virtual Event—Continued Abstracts
2020 年周围神经学会虚拟活动 - 续摘要
  • DOI:
  • 发表时间:
    2021
  • 期刊:
  • 影响因子:
    3.8
  • 作者:
    Maricris Bautista;P. Chumala;G. Katselis;Anand;Krishnan;Julia Jones;Na Wei;Jiadong Zhou;Xiang;J. Kollmer;U. Hegenbart;C. Kimmich;E. Hund;J. Purrucker;J. Hayes;S. Lentz;Georges Sam;Johann;Jende;S. Schönland;M. Bendszus;S. Heiland;M. Weiler
  • 通讯作者:
    M. Weiler

Julia Jones的其他文献

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{{ truncateString('Julia Jones', 18)}}的其他基金

US - Chile Planning Visit: Climate change effects on streamflow from mid-latitude conifer forests: a collaboration between Oregon and Chile
美国 - 智利计划访问:气候变化对中纬度针叶林径流的影响:俄勒冈州和智利之间的合作
  • 批准号:
    0917697
  • 财政年份:
    2009
  • 资助金额:
    $ 10万
  • 项目类别:
    Standard Grant
Ecosystem Informatics
生态系统信息学
  • 批准号:
    0333257
  • 财政年份:
    2003
  • 资助金额:
    $ 10万
  • 项目类别:
    Continuing Grant
A Spatially-Distributed GIS-Based Analysis of Temperatures in a Stream Network
基于空间分布式 GIS 的河流网络温度分析
  • 批准号:
    9905313
  • 财政年份:
    1999
  • 资助金额:
    $ 10万
  • 项目类别:
    Standard Grant
Dissertation Research: Landscape Controls on Stream ChannelResponse to Floods in a 5th Order Watershed in the Western Oregon Cascades
论文研究:河道景观控制对俄勒冈州西部瀑布五级流域洪水的响应
  • 批准号:
    9711774
  • 财政年份:
    1997
  • 资助金额:
    $ 10万
  • 项目类别:
    Standard Grant
Cross-Site: Stream Flow Hydrology Comparisons and Synthesis at Long-Term Ecological Research Sites - Links with Climate Terrestrial Ecosystems and Stream Ecology
跨站点:长期生态研究站点的溪流水文学比较和综合 - 与气候陆地生态系统和溪流生态学的联系
  • 批准号:
    9526987
  • 财政年份:
    1995
  • 资助金额:
    $ 10万
  • 项目类别:
    Standard Grant

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  • 批准号:
    2305518
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Role of nitrogen-rich compounds for increasing carbon sequestration in soil
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  • 批准号:
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Bacterial consortia for increase nitrogen fixation in agricultural soil
增加农业土壤固氮作用的细菌群落
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The integration of site-specific measures of soil N status and climate in improving nitrogen fertilizer use efficiency in cool humid climates
结合土壤氮状况和气候的特定地点措施来提高凉爽湿润气候下氮肥的利用效率
  • 批准号:
    RGPIN-2020-07043
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What controls soil organic carbon stability and nitrogen transformation in boreal forest soils?
是什么控制着北方森林土壤的有机碳稳定性和氮转化?
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SitS:用于检测土壤中氮和寻找氮的环境友好型传感器
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    2022
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    Continuing Grant
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评估土壤有机质中的氮对植物生长对二氧化碳升高的反应的贡献
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