Community and Ecosystem Dynamics of a Northern Temperate Forest Exposed to Elevated CO2 and O3 in a FACE System

FACE 系统中暴露于高浓度 CO2 和 O3 的北温带森林的群落和生态系统动态

• 批准号: 9652675
• 负责人: David Karnosky
• 金额: $ 58.84万
• 依托单位: Michigan Technological University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9652675&HistoricalAwards=false
• 关键词: Community; Ecosystem; Dynamics; Northern; Temperate

9652675 Karnosky The greenhouse gases, carbon dioxide (CO2) and ozone (O3), are increasing globally and are closely tracking population growth. Little is known about how these two gases will impact forest communities, as, until now, studies with these gases were done in artificial environments created by exposure chambers. In this, project we are using a state-of-the-art Free-Air Carbon Dioxide Enrichment (FACE) facility to facilitate long-term exposures of regenerating forest stands to elevated CO2 and O3, alone and in combination. The facility is being constructed on United States Forest Service land near Rhinelander, Wisconsin. A multidisciplinary team of scientists will examine mechanisms and responses in trembling aspen (Populus tremuloides), sugar maple (Acer saccharum) and paper birch (Betula papyrifera) in various competitive combinations. Of particular interest are: (1) tree physiology, growth, survival, and productivity; (2) competitive interactions among genotypes and species; (3) tree and stand carbon and nitrogen allocation; (4) pest and stress tolerance as regulated by foliar defense compounds; and (5) carbon and nitrogen cycling and ecosystem carbon storage. Three replicate FACE rings are being established for a factorial combination of treatments (control, CO2, O3, CO2, + O3) in a randomized complete block design. Our research strategy will include parallel experimentation and modeling. Thus, response data from these treatment combinations will be used to parameterize and refine an existing whole-tree and stand level process model. Our experimental design will allow us to address specific hypotheses using species of contrasting life-histories, while also affording the largest possible scope of inference for model parameterization.

小行星9652675 温室气体二氧化碳（CO2）和臭氧（O3）在全球范围内不断增加，并密切跟踪人口增长。 人们对这两种气体如何影响森林群落知之甚少，因为到目前为止，对这些气体的研究都是在暴露室创造的人工环境中进行的。 在这个项目中，我们正在使用最先进的自由空气二氧化碳富集（FACE）设施，以促进再生森林长期暴露于升高的CO2和O3，单独和组合。 该设施正在美国森林建造 服务 土地 附近 莱因兰德， 威斯康星州。 一个多学科的科学家小组将研究颤抖的白杨（胡杨），糖枫（槭）和纸桦（白桦）在各种竞争组合的机制和反应。 特别令人感兴趣的是：（1）树木生理学、生长、存活和生产力;（2）基因型和物种之间的竞争相互作用;（3）树木和林分的碳和氮分配;（4）由叶片防御化合物调节的害虫和胁迫耐受性;（5）碳和氮循环以及生态系统碳储存。 在随机完全区组设计中，针对处理（对照、CO2、O3、CO2、+ O3）的析因组合建立了三个重复FACE环。 我们的研究策略将包括平行实验和建模。 因此，来自这些治疗组合的响应数据将用于参数化和完善现有的 全木-林分水平法 模型 我们的实验设计将使我们能够使用不同生活史的物种来解决特定的假设，同时也提供了 最大 可能 范围 的 推理 为 模型参数化