BE/CBC: The Jasper Ridge Global Change Experiment: Biocomplexity in Ecosystem Responses to Long-Term Environmental Changes

BE/CBC：贾斯珀岭全球变化实验：生态系统对长期环境变化的生物复杂性响应

• 批准号: 0221838
• 负责人: Christopher Field
• 金额: $ 190万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0221838&HistoricalAwards=false
• 关键词: CBC; Jasper; Ridge; Global; Change

ABSTRACTThe Jasper Ridge Global Change Experiment: Biocomplexity in Ecosystem Responses To Long-Term Environmental ChangesThe research proposed here utilizes annual grassland as a model system to test four hypotheses concerning the regulation of the cycles of carbon, nitrogen, and water in response to global change. Specifically, the PIs will explore the mechanisms through which (1) plant physiology and species dynamics alter cycles of C, N, and H2O, (2) levels and dynamics of C, N, and H2O regulate plant species composition, (3) microorganisms control short-term and long-term N availability, and (4) plant chemical composition regulates structure and function of the soil microbial community. Together, these hypotheses dissect the complex web of feedbacks linking biogeochemical cycles and ecological dynamics. The research builds on the infrastructure and ongoing operations of the Jasper Ridge Global Change Experiment, a multi-factor, ecosystem-scale manipulation. The manipulations were initiated in 1998 with NSF support and are now supported by the Packard Foundation. They include two levels of temperature, two of CO2, two of N deposition, and two of precipitation, with single-factor manipulations as well as all of the possible 2-way, 3-way, and 4-way combinations.The team includes biogeochemists, ecophysiologists, population biologists, and microbial ecologists. The project will explore interactions between biogeochemical cycles and species dynamics across a range of time scales, from short-term physiological changes, through changes in species composition that unfold over several generations, to slow feedbacks from changes in soil stocks of C and N. The experiment's large array of treatments, plots that contain thousands of individuals of the dominant plants, and duration of several generations of the key species, provides a unique framework for addressing specific questions about biogeochemical responses to realistic global changes as well as fundamental questions about controls on major biogeochemical cycles. A modeling framework will be used that combines biogeochemistry, species changes, and species effects on biogeochemistry for synthesizing results across the project and integrating those results in the broader fabric of global-change research. This experiment is intended as a model system, where ease of manipulation and rapid responses can facilitate testing mechanistic hypotheses and establishing a framework for generalizing underlying principles to other ecosystems. The proposed research will have a range of broader impacts. Jasper Ridge provides a core for diverse projects led by students as well as independently funded researchers. Located on university campus in a major urban area, the project is highly visible and widely integrated in Stanford classes as well as organized activities for K-12 students and the general public. It is an effective tool for communicating the nature of global changes, the diversity of their impacts, and the potential of biogeochemistry research. With the funding requested here, we will focus on increasing opportunities for secondary students, with an organized curriculum and internships.

摘要jasper脊全球变化实验：生态系统对长期环境改变的研究的生物复杂性在这里提出的研究利用年度草原作为模型系统，用于测试有关调节碳，氮气和水的调节的四个假设，以响应全球变化。 Specifically, the PIs will explore the mechanisms through which (1) plant physiology and species dynamics alter cycles of C, N, and H2O, (2) levels and dynamics of C, N, and H2O regulate plant species composition, (3) microorganisms control short-term and long-term N availability, and (4) plant chemical composition regulates structure and function of the soil microbial community.这些假设共同解剖了连接生物地球化学周期和生态动力学的复杂反馈网络。该研究基于贾斯珀·岭全球变化实验的基础设施和持续运营，这是一种多因素的生态系统规模操纵。该操作是在1998年启动的，并得到了NSF的支持，现在得到Packard Foundation的支持。它们包括两个级别的温度，两个CO2，N沉积中的两个以及两个降水，以及单因素操纵以及所有可能的2向，3向和4路组合。该团队包括生物地球员，生物生理学家，人群生物学家，人群生物学家和微生物生态学家。该项目将探索各种时间尺度的生物地球化学周期与物种动态之间的相互作用，从短期生理变化到几代人的物种组成的变化，到从C和N的土壤库存变化中慢慢反馈。生物地球化学对现实的全球变化以及有关主要生物地球化学控制的基本问题。将使用一个建模框架，将生物地球化学，物种变化和物种对生物地球化学的影响结合在一起，以在整个项目中综合结果，并将这些结果整合到更广泛的全球变化研究结构中。该实验旨在作为模型系统，在该系统中，易于操作和快速响应可以促进测试机械假设并建立一个将基本原理推广到其他生态系统的框架。拟议的研究将产生一系列更广泛的影响。 Jasper Ridge为学生和独立资助的研究人员领导的各种项目提供了核心。该项目位于大学校园的主要城市校园，在斯坦福大学的课程中广泛融合，并为K-12学生和公众提供了有组织的活动。它是传达全球变化的性质，其影响的多样性以及生物地球化学研究的潜力的有效工具。在此处要求的资金下，我们将专注于通过有组织的课程和实习机会增加中学生的机会。