Collaborative LTREB Proposal: Long-Term Ecosystem Response to Chronic Atmospheric Nitrate Deposition

LTREB 协作提案：生态系统对慢性大气硝酸盐沉积的长期响应

• 批准号: 0814864
• 负责人: Andrew Burton
• 金额: $ 15.16万
• 依托单位: Michigan Technological University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0814864&HistoricalAwards=false
• 关键词: Collaborative; LTREB; Proposal; Long; Term

As the Earth's climate warms over the next century, ecosystems throughout the northern hemisphere also will be exposed to elevated rates of atmospheric nitrogen (N) deposition. Understanding this complex environmental change lies at the heart of our ability to anticipate the degree to which forests will sequester human-produced carbon dioxide from the atmosphere. An interdisciplinary team of scientists will investigate the interaction between climate warming and simulated atmospheric N deposition using a long-term, regional-based, field experiment located in sugar maple-dominated forest ecosystems common throughout eastern North America. Over the past 10 years, simulated atmospheric nitrogen deposition at rates expected to occur by 2050 have increased tree growth and slowed the decay of dead leaves and roots, increasing the amount of carbon stored in this wide-spread ecosystem. However, it is uncertain whether carbon storage will stabilize at a higher equilibrium over the long-term as atmospheric nitrogen deposition increases, or whether expected warming will counteract this effect. The proposed research will quantify the amounts of carbon stored in overstory trees, forest floor and soil over the next decade, allowing this team of scientists to test hypotheses regarding the interaction of climate warming and atmospheric nitrogen deposition on ecosystem carbon sequestration. The results of this project will be disseminated to other global change scientists, K-12 teachers, and the general public through the development of user-friendly, web-based tools. In addition the team of investigators will continue conducting the annual Global Change Teachers Institute. Through lectures and field-based learning, middle and high school teachers develop an understanding of the causes and ecological impacts of global environmental change, thereby bringing this information into science curricula.

随着下个世纪地球气候变暖，整个北半球的生态系统也将面临大气氮 (N) 沉降率升高的影响。了解这种复杂的环境变化是我们预测森林从大气中吸收人类产生的二氧化碳程度的能力的核心。一个跨学科的科学家团队将通过在北美东部常见的以糖枫为主的森林生态系统中进行长期、区域性的实地实验，研究气候变暖与模拟大气氮沉降之间的相互作用。在过去的 10 年里，模拟大气氮沉降率预计到 2050 年就会增加，从而促进了树木的生长，减缓了枯叶和根的腐烂，从而增加了这个广泛的生态系统中储存的碳量。然而，随着大气氮沉降的增加，碳储存是否会长期稳定在较高的平衡状态，或者预期的变暖是否会抵消这种影响尚不确定。拟议的研究将量化未来十年内林木、森林地面和土壤中储存的碳量，使该科学家团队能够检验有关气候变暖和大气氮沉降对生态系统碳固存相互作用的假设。该项目的成果将通过开发用户友好的网络工具传播给其他全球变化科学家、K-12 教师和公众。此外，研究小组将继续举办年度全球变化教师研究所。通过讲座和实地学习，初中和高中教师了解全球环境变化的原因和生态影响，从而将这些信息纳入科学课程。