Dissertation Research: Closing the nitrogen budget: Quantifying denitrification in an arid ecosystem undergoing nitrogen enrichment

论文研究:关闭氮预算:量化经历氮富集的干旱生态系统中的反硝化

基本信息

  • 批准号:
    1309124
  • 负责人:
  • 金额:
    $ 2.08万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2013
  • 资助国家:
    美国
  • 起止时间:
    2013-07-01 至 2015-06-30
  • 项目状态:
    已结题

项目摘要

Adding reactive nitrogen, from fertilizer, deposition, or nitrogen fixing plants, to ecosystems can cause rapid and often detrimental changes considered undesirable by humans. The creation of dinitrogen gas (N2) through a process called denitrification is the primary mechanism that removes reactive nitrogen from an ecosystem. However, this process can also produce nitrous oxide (N2O), a greenhouse gas. Therefore, understanding how much N2 versus N2O is produced during denitrification is critical to understanding both climate and ecosystem nutrient balance. One of the challenges of studying denitrification in the real world is that it is very difficult to measure the production of N2 in the field. The work proposed here will take advantage of a new lab measurement technique to measure the production of N2 from soils and examine how denitrification, N2 and N2O production and nitrogen cycling change after the expansion of a nitrogen-fixing trees into an arid subtropical grassland.Arid lands occupy nearly a third of the Earth's surface and support large human populations, so understanding the processing of nitrogen in these systems is important for future land use and global climate management. This project will provide the first estimate of the N2 loss occurring during denitrification in an arid system nitrogen cycle, and help to refine a method that can then be applied to other sites and ecosystems. The primary research site used in this project is an active cattle ranch in Southern Texas that is regularly visited by students, land managers and nature enthusiasts. This project will take advantage of this public interface to educate on the effects and importance of human-driven landscape changes on ecosystem nutrient cycling.
向生态系统添加来自肥料、沉积或固氮植物的活性氮可能会导致人类不希望发生的快速且往往有害的变化。通过反硝化过程产生氮气 (N2) 是从生态系统中去除活性氮的主要机制。然而,这个过程也会产生一氧化二氮(N2O),一种温室气体。因此,了解反硝化过程中产生的 N2 与 N2O 的量对于了解气候和生态系统养分平衡至关重要。在现实世界中研究反硝化的挑战之一是很难在现场测量氮气的产生。这里提出的工作将利用一种新的实验室测量技术来测量土壤中氮的产生,并研究固氮树木扩展到干旱的亚热带草原后反硝化、N2和N2O的产生以及氮循环的变化。干旱土地占据地球表面的近三分之一并养活了大量人口,因此了解这些系统中氮的处理对于未来的土地利用和全球至关重要。 气候管理。该项目将首次估计干旱系统氮循环反硝化过程中发生的氮损失,并有助于完善一种可应用于其他地点和生态系统的方法。该项目使用的主要研究地点是德克萨斯州南部的一个活跃的养牛场,学生、土地管理者和自然爱好者定期参观该牧场。该项目将利用这个公共界面来教育人类驱动的景观变化对生态系统养分循环的影响和重要性。

项目成果

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Jed Sparks其他文献

Jed Sparks的其他文献

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{{ truncateString('Jed Sparks', 18)}}的其他基金

Collaborative Research: Dimensions: Integrating phylogenetics, ecophysiology and transcriptomics to understand the diversity of hornwort-cyanobacterium symbiosis
合作研究:维度:整合系统发育学、生态生理学和转录组学,了解金鱼藻-蓝藻共生的多样性
  • 批准号:
    1831416
  • 财政年份:
    2019
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Standard Grant
Dissertation Research: The genetic architecture and ecological function of a novel coloration phenotype
论文研究:新型着色表型的遗传结构和生态功能
  • 批准号:
    1309171
  • 财政年份:
    2013
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Standard Grant
Dissertation Research: Genetic and Environmental Mechanisms Mediating Disease Resistance and Tolerance in Amphibians
论文研究:介导两栖动物抗病性和耐受性的遗传和环境机制
  • 批准号:
    1310036
  • 财政年份:
    2013
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Standard Grant
DISSERTATION RESEARCH: The Effects of Elevated Ozone on Global Carbon and Water Cycling Mediated by Plants
论文研究:臭氧浓度升高对植物介导的全球碳和水循环的影响
  • 批准号:
    1010892
  • 财政年份:
    2010
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Standard Grant
COLLABORATIVE RESEARCH: Adaptive Differentiation, Selection and Water Use of a Seasonally Dry Tropical Oak: Implications for Global Change
合作研究:季节性干燥热带橡树的适应性分化、选择和用水:对全球变化的影响
  • 批准号:
    0843368
  • 财政年份:
    2009
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Continuing Grant
DISSERTATION RESEARCH: Combined Effects of Elevated NO2, O3, and CO2 on Plant Growth and Productivity
论文研究:升高的 NO2、O3 和 CO2 对植物生长和生产力的综合影响
  • 批准号:
    0710005
  • 财政年份:
    2007
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Standard Grant
DISSERTATION RESEARCH: Trace N Gas Efflux From Aridland Systems: Partitioning Abiotic and Biotic Drivers
论文研究:干旱地区系统中的痕量 N 气体流出:非生物和生物驱动因素的划分
  • 批准号:
    0709642
  • 财政年份:
    2007
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Standard Grant
Soil Emissions of Nitrogen Trace Gases: Leveraging the Decommissioning of the Desert FACE Site
氮微量气体的土壤排放:利用沙漠 FACE 站点的退役
  • 批准号:
    0717296
  • 财政年份:
    2007
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Continuing Grant
CAREER: Direct Foliar Uptake of Atmospheric Nitrogen: Molecular to Ecosystem Considerations
职业:叶面直接吸收大气氮:分子到生态系统的考虑
  • 批准号:
    0237674
  • 财政年份:
    2003
  • 资助金额:
    $ 2.08万
  • 项目类别:
    Standard Grant

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