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

协作 LTREB：生态系统对慢性大气硝酸盐沉积的长期响应

• 批准号: 0816618
• 负责人: Kurt Pregitzer
• 金额: $ 9.64万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2010-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0816618&HistoricalAwards=false
• 关键词: Collaborative; LTREB; Long; Term; Ecosystem

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，整个北方的生态系统也将暴露于大气氮（N）沉积速率的升高。理解这种复杂的环境变化是我们预测森林将在多大程度上从大气中吸收人类产生的二氧化碳的能力的核心。一个跨学科的科学家团队将研究气候变暖和模拟大气氮沉降之间的相互作用，使用长期的，基于区域的，位于整个北美东部常见的糖枫主导的森林生态系统的实地实验。在过去的10年里，模拟的大气氮沉降速度预计将在2050年发生，这增加了树木的生长，减缓了枯叶和树根的腐烂，增加了这个广泛分布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水平，或者预期的变暖是否会抵消这一影响，目前还不确定。这项拟议中的研究将量化未来十年中储存在上层树木，森林地面和土壤中的碳量，使这支科学家团队能够测试关于气候变暖和大气氮沉积对生态系统碳封存的相互作用的假设。该项目的成果将通过开发方便用户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，调查小组将继续举办年度全球变革教师研究会。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，从而将这一信息纳入科学课程。