Feedbacks between Calcium Cycling and Canopy Tree Dynamics in Northern Temperate Forests

北温带森林钙循环与冠层树木动态之间的反馈

• 批准号: 9815390
• 负责人: Charles Canham
• 金额: $ 45万
• 依托单位: Cary Institute of Ecosystem Studies, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-15 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9815390&HistoricalAwards=false
• 关键词: Feedbacks; between; Calcium; Cycling; Canopy

Abstract98-15390Charles CanhamFeedbacks between calcium cycling and canopy tree dynamics in a north temperate forestThere has been widespread concern that acid deposition is depleting the supply of calcium (a critical nutrient for plant growth) in the soils of northeastern U.S. forests. Tree species in those forests appear to differ strikingly in both their demand for calcium, and their effects on the availability of calcium in the soil. The proposed research will (1) determine the mechanisms by which tree species regulate the availability of Ca in the soil beneath them, (2) determine the responses of tree seedlings and saplings to variation in Ca availability, and (3) develop a quantitative, predictive model of the long-term consequences of these processes for the dynamics of northeastern forests. The research will provide a bridge between two traditionally distinct fields of forest ecology: the study of population and community dynamics of forest trees, and nutrient cycling in forest ecosystems.

北温带森林中钙循环与树冠树动态之间的反馈人们普遍关注酸沉降正在耗尽美国东北部森林土壤中的钙（植物生长的关键营养素）的供应。 这些森林中的树种似乎在对钙的需求和对土壤中钙的有效性的影响方面存在显著差异。 拟议的研究将（1）确定树种调节其下方土壤中钙的可用性的机制，（2）确定树苗和树苗对钙可用性变化的反应，以及（3）开发这些过程对东北森林动态的长期影响的定量预测模型。 该研究将在森林生态学的两个传统上不同的领域之间架起一座桥梁：森林树木的种群和群落动态研究，以及森林生态系统中的养分循环。