Pulses of Biogenic Nitrogen Cycling Lead to Atmospheric-Based Nutrient Spiraling in Southern California

生物氮循环脉冲导致南加州大气养分螺旋上升

基本信息

  • 批准号:
    1656062
  • 负责人:
  • 金额:
    $ 89.11万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2017
  • 资助国家:
    美国
  • 起止时间:
    2017-08-01 至 2021-07-31
  • 项目状态:
    已结题

项目摘要

The cycling of nitrogen in arid lands, deserts, and areas with limited water and frequent high temperatures is challenging to study and does not fit within the current understanding of other areas such as forests or grasslands. In arid lands, nitrogen concentrations are generally low and many biological processes are limited by nitrogen availability during wet periods.  However, many arid land ecosystems also exhibit high rates of nitrogen loss more characteristic of areas with a nitrogen abundance.  During wet periods soils may emit high nitrogen concentrations. Because of these nitrogen pulses, arid lands may have an important role in atmospheric chemistry although the magnitudes or fate of emissions are not well known.  Return of the soil nitrogen pulses to the soil may be a previously unaccounted nutrient source contributing to downwind nitrogen deposition.  New research directed to characterizing arid land nitrogen dynamics across landscapes may resolve these apparent contradictions, contribute to more comprehensive understanding, and improve understanding of the broad-scale effects of nitrogen enrichment. The findings will be communicated to the federal and state agencies that are directly affected by atmospheric nitrogen including Joshua Tree National Park.  Training opportunities, targeted for underrepresented graduate and undergraduate students, include tools for trace gases, isotopes, genomes, and modeling.  The results will be communicated to the local community through UC Cooperative Extension and an annual public lecture series that targets K-12 educators throughout the region.  This project will develop and test a hypothesis of pulse-induced nutrient spiraling to explain the landscape distribution of nitrogen concentrations and sources in southern California.  The central hypothesis borrows from nutrient dynamics in stream systems where movement downstream leads to biogeochemical ?spirals?, as nutrients cycle from dissolved and biotic forms.  In arid lands, it is hypothesized that soil pulses of gaseous nitrogen emissions coupled with atmospheric transport and deposition forms such a spiral and propagates nitrogen enrichment across a landscape.   This hypothesis will be evaluated across a transect of decreasing nitrogen deposition extending from Riverside, CA to the eastern edge of Joshua Tree National Park where replicated experiments will be conducted that assess soil nitrogen pulses and identifies their sources through isotopic and genomic tools. These experiments will test predictions that pulses of soil nitrogen emissions have characteristic isotopic signatures and increasingly dominate soil nitrogen content downwind from urban sources.  The experimental results will be used to inform a regional atmospheric transport and chemistry model that will simulate nitrogen dynamics throughout southern California.  The model simulations will further test predictions that soil pulse emissions can influence atmospheric nitrogen chemistry and subsequent nitrogen deposition.
氮在干旱土地、沙漠和水资源有限且经常高温的地区的循环研究具有挑战性,并且不符合目前对森林或草原等其他地区的理解。在干旱地区,氮浓度一般较低,许多生物过程受到湿润期氮供应的限制。 然而,许多干旱土地生态系统也表现出高氮损失率,这更具有氮丰富地区的特征。 在潮湿时期,土壤可能会释放出高浓度的氮。由于这些氮脉冲,干旱土地可能在大气化学中发挥重要作用,尽管排放的程度或命运尚不清楚。 土壤氮脉冲返回土壤可能是以前未考虑的营养源,有助于顺风氮沉积。 新的研究针对表征干旱土地氮动态景观可能会解决这些明显的矛盾,有助于更全面的理解,并提高氮富集的大规模影响的理解。研究结果将被传达到联邦和州机构,直接受大气氮,包括约书亚树国家公园。 培训机会,针对代表性不足的研究生和本科生,包括痕量气体,同位素,基因组和建模工具。 结果将通过UC合作推广和针对整个地区K-12教育工作者的年度公开讲座系列传达给当地社区。 本计画将发展并测试脉冲诱导营养螺旋的假说,以解释加州南部氮浓度与来源的景观分布。 中心假设借用营养动态在河流系统中的运动下游导致生态地球化学?螺旋?因为养分从溶解的和生物的形式循环。 在干旱地区,据推测,土壤脉冲的气态氮排放加上大气传输和沉积形成这样一个螺旋和传播氮富集在整个景观。 这一假设将在从加利福尼亚州滨江到约书亚树国家公园东部边缘的氮沉降减少的横断面上进行评估,在该横断面上将进行重复实验,评估土壤氮脉冲并通过同位素和基因组工具确定其来源。这些实验将测试土壤氮排放脉冲具有特征同位素特征的预测,并越来越多地主导城市来源的顺风土壤氮含量。 实验结果将用于通知区域大气传输和化学模型,该模型将模拟整个南加州的氮动力学。 模型模拟将进一步测试土壤脉冲排放可能影响大气氮化学和随后的氮沉降的预测。

项目成果

期刊论文数量(8)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Ecological contributions to human health in cities
  • DOI:
    10.1007/s10980-018-0708-y
  • 发表时间:
    2018-10-01
  • 期刊:
  • 影响因子:
    5.2
  • 作者:
    Jenerette, G. Darrel
  • 通讯作者:
    Jenerette, G. Darrel
Exotic grass litter modulates seasonal pulse dynamics of CO2 and N2O, but not NO, in Mediterranean-type coastal sage scrub at the wildland-urban interface
在荒地与城市交界处的地中海型沿海鼠尾草灌木丛中,异国草凋落物调节 CO2 和 N2O 的季节性脉冲动态,但不调节 NO
  • DOI:
    10.1007/s11104-020-04722-x
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    4.9
  • 作者:
    Andrews, Holly M.;Jenerette, G. Darrel
  • 通讯作者:
    Jenerette, G. Darrel
Causes and feedbacks to widespread grass invasion into chaparral shrub dominated landscapes
草丛广泛入侵丛林灌木为主的景观的原因和反馈
  • DOI:
    10.1007/s10980-019-00800-3
  • 发表时间:
    2019
  • 期刊:
  • 影响因子:
    5.2
  • 作者:
    Park, Isaac W.;Jenerette, G. Darrel
  • 通讯作者:
    Jenerette, G. Darrel
Soil NH3 emissions across an aridity, soil pH, and N deposition gradient in southern California
  • DOI:
    10.1525/elementa.2022.00123
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Alexander H. Krichels;Peter M. Homyak;E. Aronson;J. Sickman;Jon K. Botthoff;Aral C. Greene;Holly M. Andrews;Hannah B Shulman;S. Piper;G. D. Jenerette
  • 通讯作者:
    Alexander H. Krichels;Peter M. Homyak;E. Aronson;J. Sickman;Jon K. Botthoff;Aral C. Greene;Holly M. Andrews;Hannah B Shulman;S. Piper;G. D. Jenerette
An expanded framework for wildland–urban interfaces and their management
荒地与城市界面及其管理的扩展框架
  • DOI:
    10.1002/fee.2533
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    10.3
  • 作者:
    Jenerette, G Darrel;Anderson, Kurt E;Cadenasso, Mary L;Fenn, Mark;Franklin, Janet;Goulden, Michael L;Larios, Loralee;Pincetl, Stephanie;Regan, Helen M;Rey, Sergio J
  • 通讯作者:
    Rey, Sergio J
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George Jenerette其他文献

George Jenerette的其他文献

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{{ truncateString('George Jenerette', 18)}}的其他基金

Collaborative Research: Understanding the hydrologic consequences of urban irrigation across the U.S.
合作研究:了解美国城市灌溉的水文后果
  • 批准号:
    1923150
  • 财政年份:
    2019
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
CNH2-L: Toward a Theory of Urban Trees as Living Infrastructure
CNH2-L:走向城市树木作为生命基础设施的理论
  • 批准号:
    1924288
  • 财政年份:
    2019
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
DISSERTATION RESEARCH: Connecting dryland soil trace gas emissions of NOx, N2O and CO2 to microbial community dynamics along a nitrogen deposition gradient
论文研究:将旱地土壤中 NOx、N2O 和 CO2 的痕量气体排放与沿氮沉降梯度的微生物群落动态联系起来
  • 批准号:
    1405525
  • 财政年份:
    2014
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
Dissertation Research: The effect of human management and soil properties on heavy metal content of Los Angeles Community Garden soils
论文研究:人类管理和土壤性质对洛杉矶社区花园土壤重金属含量的影响
  • 批准号:
    1210953
  • 财政年份:
    2012
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
Type I - LOI#L02170258 - Collaborative Research: Assessing Decadal Climate Change Impacts on Urban Populations in the Southwestern USA
I 型 - LOI
  • 批准号:
    1049224
  • 财政年份:
    2011
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
Research Starter Grant: An Urban Environmental Observatory
研究启动资助:城市环境观测站
  • 批准号:
    0906169
  • 财政年份:
    2009
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
Collaborative Research: Toward a Biogeography of Urban Forests
合作研究:城市森林生物地理学
  • 批准号:
    0919006
  • 财政年份:
    2009
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
CNH: Collaborative Research: Urban Vulnerability to Climate Change: A System Dynamics Analysis
CNH:合作研究:城市对气候变化的脆弱性:系统动力学分析
  • 批准号:
    0814692
  • 财政年份:
    2008
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Standard Grant
Postdoctoral Research Fellowship in Biological Informatics for FY 2006
2006财年生物信息学博士后研究奖学金
  • 批准号:
    0532789
  • 财政年份:
    2005
  • 资助金额:
    $ 89.11万
  • 项目类别:
    Fellowship Award

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CAREER: Elucidating Biogenic Control of Heterogenous Ice Nucleation
职业:阐明异质冰核的生物控制
  • 批准号:
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    2024
  • 资助金额:
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