Species-, Community-, and Ecosystem-Level Consequences of the Interactions Among Multiple Resources

多种资源之间相互作用的物种、群落和生态系统层面的后果

• 批准号: 0108960
• 负责人: Edward Rastetter
• 金额: $ 41.79万
• 依托单位: Marine Biological Laboratory
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-15 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0108960&HistoricalAwards=false
• 关键词: Species; Community; Ecosystem; Level; Consequences

All plants need to acquire at least 15 elements from their environment including carbon, nitrogen, phosphorus and sulphur. In addition to these element resources, plants also require light and water. Although the relative requirement for these resources by plants remains relatively constant, their relative availability in the environment can vary drastically in both space and time. Plants must therefore adjust to this variability in resource availability to maintain a balanced nutrition. The relative success of various species in making this adjustment will in part determine the productivity of the ecosystem, the composition of the plant community, the species diversity, the rates of nutrient cycling, and the rate of CO2 storage or loss. In this grant, a theoretical foundation is established for understanding the complex interactions among multiple resources and the consequences of these interactions on species, on communities of plants, and on ecosystem processes like nutrient cycling and carbon sequestration. The theory is then tested using data from the Arctic Tundra Long-Term Ecological Research (LTER) site in northern Alaska.

所有植物都需要从其环境中获得至少15个元素，包括碳，氮，磷和硫。 除了这些元素资源外，植物还需要光和水。 尽管植物对这些资源的相对要求仍然相对稳定，但它们在环境中的相对可用性在时空和时间上都可能发生巨大变化。 因此，植物必须适应这种资源可用性的可变性，以维持平衡的营养。 各种物种在进行此调整方面的相对成功将部分决定生态系统的生产率，植物群落的组成，物种多样性，营养循环速率以及二氧化碳储存率。 在这笔赠款中，建立了一个理论基础，以理解多个资源之间的复杂相互作用以及这些相互作用对物种，对植物社区以及生态系统过程（如营养循环和碳碳酸续集）的后果。 然后，使用来自阿拉斯加北部的北极苔原长期生态研究（LTER）地点的数据对该理论进行了测试。