Collaborative Research: Climate-induced sea-level rise, warming and herbivory effects on vegetation and greenhouse gas emission in coastal western Alaska

合作研究：气候引起的海平面上升、变暖和食草对阿拉斯加西部沿海植被和温室气体排放的影响

• 批准号: 2113750
• 负责人: Katharine Kelsey
• 金额: $ 37.7万
• 依托单位: University of Colorado at Denver-Downtown Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-02-01 至 2026-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2113750&HistoricalAwards=false
• 关键词: Collaborative; Research; Climate; induced; sea

Arctic coastal wetlands are experiencing the effects of climate change, including warming temperatures, flooding from sea level rise, and changes to the number of geese that migrate in the summer and graze on local plants. The Yukon-Kuskokwim (Y-K) Delta of Alaska is one of the largest river deltas in the world and an important ecosystem for millions of migratory geese. This research looks at how warming, increased flooding, and changes in the impacts of geese will affect different plant communities and the uptake and release of greenhouse gases, which influence the rate of climate change. The investigators will conduct field experiments in different plant communities that will experience different levels of flooding, warming, and goose impacts, and measure plant and greenhouse gas responses to these changes. The investigators will also conduct laboratory experiments where the investigators can tightly control temperature, flooding, and effects of geese to better understand the mechanisms behind our measured field responses. This project expands our understanding because it will be conducted across both coastal and inland landscapes in the Y-K Delta, unlike previous research. The experiments will look at complex interactions between flooding, warming, and goose grazing to tease apart these three effects. The deep understanding provided from these experiments can also be applied to other ecosystems because many coastal regions in the Arctic are experiencing similar climate changes. The investigators will work with a school teacher to build learning modules based on this research that will be used in middle schools across native villages in the Y-K Delta. The researchers will work with local high school students at the research site to train them in field techniques as well as help them develop a story about the research for the local radio station. Finally, the investigators will train and mentor a post-doctoral researcher, two graduate students, and undergraduates at three universities, who will disseminate their findings through scientific conferences and publications. Arctic coastal wetlands are experiencing significant consequences of climate change, including increasing temperature, rising sea level, and changing waterfowl abundances. The Yukon-Kuskokwim (Y-K) Delta in Alaska, one of the largest river deltas in the world, is an important refuge for millions of migratory birds and one of the most vulnerable regions in North America to these changes. The overall goal of this proposal is to investigate how increasing temperature and flooding, in light of changing waterfowl abundances, interact to affect plant communities and greenhouse gas (GHG) emissions, specifically carbon dioxide and methane, across the Y-K Delta landscape. To address this goal, the investigators will conduct a large-scale field experiment, where they will manipulate temperature, flooding regimes, and goose impacts to quantify how these variables interact to influence plant communities and GHG fluxes. The investigators will use laboratory experiments to expand inference and understanding of the mechanisms behind the measured responses. The combination of these approaches will result in a greater understanding of what drives vegetation community dynamics and GHG emissions from this system. The proposed research addresses three gaps in knowledge: 1) This research expands our knowledge about GHG fluxes in the Y-K Delta by measuring the controls on GHGs in both coastal and inland plant communities; 2) The results will inform prediction of how climate-induced changes will interact to influence communities and GHG fluxes in the future; and 3) By improving understanding of the mechanisms that drive GHG fluxes across a gradient of conditions, the work will improve understanding of how GHG fluxes will be affected by climate change in other high-latitude coastal wetland systems. For broader impacts, the investigators will work with a local school teacher to build learning modules from our research to be used in middle schools across native villages in the Y-K Delta. The investigators will work with local high school students at the research site to train them in field techniques as well as help them develop a story about the research for the local radio station. The investigators will train and mentor a post-doctoral researcher, two graduate students, and undergraduates at three universities, who will disseminate their findings through scientific conferences and publications.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

北极沿海湿地正在经历气候变化的影响，包括气温变暖、海平面上升引起的洪水，以及夏季迁徙和吃当地植物的鹅数量的变化。阿拉斯加的育空-库斯科奎姆 (Y-K) 三角洲是世界上最大的河流三角洲之一，也是数百万候鸟的重要生态系统。这项研究着眼于变暖、洪水增加以及鹅影响的变化将如何影响不同的植物群落以及温室气体的吸收和释放，从而影响气候变化的速度。研究人员将在不同的植物群落中进行实地实验，这些植物群落将经历不同程度的洪水、变暖和鹅影响，并测量植物和温室气体对这些变化的反应。研究人员还将进行实验室实验，在这些实验中，研究人员可以严格控制温度、洪水和鹅的影响，以更好地了解我们测量的现场响应背后的机制。该项目扩展了我们的理解，因为与之前的研究不同，它将在 Y-K 三角洲的沿海和内陆地区进行。这些实验将研究洪水、变暖和放牧鹅之间的复杂相互作用，以区分这三种影响。这些实验提供的深刻理解也可以应用于其他生态系统，因为北极的许多沿海地区正在经历类似的气候变化。研究人员将与一名学校老师合作，​​根据这项研究构建学习模块，并将在 Y-K 三角洲原住民村庄的中学中使用。研究人员将与研究地点的当地高中生合作，对他们进行现场技术培训，并帮助他们为当地广播电台编写有关该研究的故事。最后，研究人员将培训和指导三所大学的一名博士后研究员、两名研究生和本科生，他们将通过科学会议和出版物传播他们的发现。北极沿海湿地正在经历气候变化的重大后果，包括气温升高、海平面上升和水禽数量变化。阿拉斯加的育空-库斯科奎姆 (Y-K) 三角洲是世界上最大的河流三角洲之一，是数百万候鸟的重要避难所，也是北美最容易受到这些变化影响的地区之一。该提案的总体目标是调查随着水禽数量的变化，温度升高和洪水如何相互作用，从而影响 Y-K 三角洲景观中的植物群落和温室气体 (GHG) 排放，特别是二氧化碳和甲烷。为了实现这一目标，研究人员将进行大规模的现场实验，他们将操纵温度、洪水状况和鹅影响，以量化这些变量如何相互作用以影响植物群落和温室气体通量。研究人员将利用实验室实验来扩大对测量反应背后机制的推论和理解。这些方法的结合将使人们更好地了解驱动植被群落动态和该系统温室气体排放的因素。拟议的研究解决了三个知识空白：1）这项研究通过测量沿海和内陆植物群落的温室气体控制措施，扩展了我们对 Y-K 三角洲温室气体通量的了解； 2）结果将有助于预测气候引起的变化将如何相互作用，从而影响未来的社区和温室气体通量； 3）通过加深对在不同条件梯度下驱动温室气体通量的机制的理解，这项工作将增进对其他高纬度沿海湿地系统中温室气体通量将如何受到气候变化影响的理解。为了产生更广泛的影响，研究人员将与当地学校教师合作，根据我们的研究构建学习模块，供 Y-K 三角洲原住民村庄的中学使用。研究人员将与研究地点的当地高中生合作，对他们进行现场技术培训，并帮助他们为当地广播电台编写有关该研究的故事。研究人员将培训和指导三所大学的一名博士后研究员、两名研究生和本科生，他们将通过科学会议和出版物传播他们的研究结果。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。

项目成果

Goose Feces Effects on Subarctic Soil Nitrogen Availability and Greenhouse Gas Fluxes

鹅粪便对亚北极土壤氮素有效性和温室气体通量的影响

• DOI: 10.1007/s10021-022-00752-x
• 发表时间: 2022-03
• 期刊: Ecosystems
• 影响因子: 3.7
• 作者: Beard, Karen H.;Kelsey, Katharine C.;Choi, Ryan T.;Welker, Jeffrey M.;Leffler, A. Joshua
• 通讯作者: Leffler, A. Joshua

Short‐term effects of experimental goose grazing and warming differ in three low‐Arctic coastal wetland plant communities

实验性鹅放牧和气候变暖对三个低纬度北极沿海湿地植物群落的短期影响不同

• DOI: 10.1111/jvs.13139
• 发表时间: 2022-06
• 期刊: Journal of Vegetation Science
• 影响因子: 2.8
• 作者: Choi, Ryan T.;Petit Bon, Matteo;Leffler, A. Joshua;Kelsey, Katharine C.;Welker, Jeffrey M.;Beard, Karen H.
• 通讯作者: Beard, Karen H.