Mechanisms and feedback consequences of shrub expansion following long-term increases in winter snow depth in northern Alaska: a legacy for IPY

阿拉斯加北部冬季积雪深度长期增加后灌木扩张的机制和反馈后果:IPY 的遗产

基本信息

  • 批准号:
    0612534
  • 负责人:
  • 金额:
    $ 62.21万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2006
  • 资助国家:
    美国
  • 起止时间:
    2006-09-01 至 2010-08-31
  • 项目状态:
    已结题

项目摘要

Welker - 0612534Funds are provided for a detailed, mechanistic investigation of how shrubs become dominant in response to snow depth increases - a process that has been observed to occur in Alaska. This study will quantitatively document how increases in shrubs have altered the abiotic environment and caused a fundamental change in the functional attributes of these systems in arctic Alaska. The specific goals of this project are to: 1. quantitatively document how shrub increases affect the year-long temperature and water regimes of arctic tundra and how shrub increases change the energy balance of the system; 2. delineate the processes controlling shrub increases, especially soil and plant nitrogen cycling and the physical protection of shrub meristems and branches by deeper snow; and 3. quantitively describe how shrub density increases have affected the patterns and magnitudes of carbon [C] cycling [C gain, C loss and C allocation], water sources and growth, both aboveground and belowground.Observed shrub expansion within portions of arctic Alaska may have significant consequences, including shifts in the albedo-climate feedback, altered animal abundances, and changes in carbon and nitrogen cycling processes. As warming is progressing at a rapid rate in Alaska, a mechanistic understanding of the biotic response is needed, if informed land use decisions are to be made and if accurate forecasting models are to be developed.
Welker -0612534基金提供了一个详细的,机械的调查如何灌木成为主导地位,以应对积雪深度的增加-一个过程,已观察到发生在阿拉斯加。 这项研究将定量记录灌木的增加如何改变非生物环境,并导致这些系统在阿拉斯加北极的功能属性的根本变化。 本项目的具体目标是:1.定量地记录了灌木的增加如何影响北极苔原全年的温度和水分状况,以及灌木的增加如何改变系统的能量平衡; 2.描述控制灌木增加的过程,特别是土壤和植物氮循环以及更深的雪对灌木分生组织和树枝的物理保护;和3.定量描述灌木密度的增加如何影响碳[C]循环[C增益,C损失和C分配]的模式和幅度,水资源和生长,地上和地下。观察到的阿拉斯加北极部分地区的灌木扩张可能会产生重大后果,包括气候反馈的变化,改变动物丰度,以及碳和氮循环过程的变化。 由于阿拉斯加的气候变暖速度很快,如果要做出明智的土地利用决策,如果要开发准确的预测模型,就需要对生物反应进行机械性的理解。

项目成果

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Jeffrey Welker其他文献

From thaw till fall: Interacting hydrology, carbon cycle, and greenhouse gas dynamics in a subarctic stream-lake continuum
从解冻到秋季:亚北极河流-湖泊连续体中相互作用的水文学、碳循环和温室气体动态
  • DOI:
    10.1016/j.scitotenv.2024.177434
  • 发表时间:
    2024-12-20
  • 期刊:
  • 影响因子:
    8.000
  • 作者:
    Kaisa-Riikka Mustonen;Hannu Marttila;Kaisa Lehosmaa;Jack Chapman;Sari Juutinen;Iina Koivunen;Mika Korkiakoski;Annalea Lohila;Jeffrey Welker;Jussi Jyväsjärvi
  • 通讯作者:
    Jussi Jyväsjärvi

Jeffrey Welker的其他文献

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{{ truncateString('Jeffrey Welker', 18)}}的其他基金

RAPID: Fingerprinting new water-carbon interactions in the Arctic: Isotopic measurements through the Northwest Passage and in Baffin Bay
RAPID:对北极新的水-碳相互作用进行指纹识别:通过西北航道和巴芬湾的同位素测量
  • 批准号:
    2133156
  • 财政年份:
    2021
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Arctic water isotope cycle processes and patterns in the Central Arctic during an International Arctic Drift Expedition (MOSAiC)
国际北极漂流考察 (MOSAiC) 期间北极中部的北极水同位素循环过程和模式
  • 批准号:
    1852614
  • 财政年份:
    2019
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Collaborative Research: Using the ITEX-AON network to document and understand terrestrial ecosystem change in the Arctic
合作研究:利用 ITEX-AON 网络记录和了解北极陆地生态系统的变化
  • 批准号:
    1836873
  • 财政年份:
    2019
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Continuing Grant
Collaborative Research: Nutritional Landscapes of Arctic Caribou: Observations, Experiments, and Models Provide Process-Level Understanding of Forage Traits and Trajectories
合作研究:北极驯鹿的营养景观:观察、实验和模型提供了对饲料特性和轨迹的过程级理解
  • 批准号:
    1604249
  • 财政年份:
    2017
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Arctic Observing Networks: Collaborative Research: ITEX AON - understanding the relationships between vegetation change, plant phenology, and ecosystem function in a warming Arctic
北极观测网络:合作研究:ITEX AON - 了解北极变暖中植被变化、植物物候和生态系统功能之间的关系
  • 批准号:
    1504141
  • 财政年份:
    2016
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Collaborative Research: EAGER: Quantifying the Sources of Arctic Tundra-Respired CO2 Year-Round via Continuous in Situ Sampling of 14CO2
合作研究:EAGER:通过 14CO2 连续原位采样量化全年北极苔原呼吸二氧化碳的来源
  • 批准号:
    1650084
  • 财政年份:
    2016
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Collaborative Research: Asynchrony in the timing of goose-vegetation interactions: implications for biogeochemical cycling in wet sedge tundra
合作研究:鹅与植被相互作用的时间异步:对湿莎草苔原生物地球化学循环的影响
  • 批准号:
    1304879
  • 财政年份:
    2014
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Arctic Observing Networks: Collaborative Research: Sustaining and amplifying the ITEX AON through automation and increased interdisciplinarity of observations
北极观测网络:合作研究:通过自动化和增加观测的跨学科性来维持和扩大 ITEX AON
  • 批准号:
    1433063
  • 财政年份:
    2014
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Collaborative Research: Quantifying changes in the Arctic hydrological cycle at the landscape scale using advances in water vapor isotope (d18O and dD) techniques and aircraft
合作研究:利用水蒸气同位素(d18O和dD)技术和飞机的进步,在景观尺度上量化北极水文循环的变化
  • 批准号:
    1332268
  • 财政年份:
    2013
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant
Collaborative Research: Quantifying changes in the Arctic hydrological cycle at the landscape scale using advances in water vapor isotope (18O & D) techniques and aircraft
合作研究:利用水蒸气同位素(18O)的进步,在景观尺度上量化北极水文循环的变化
  • 批准号:
    1203472
  • 财政年份:
    2012
  • 资助金额:
    $ 62.21万
  • 项目类别:
    Standard Grant

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