US-Costa Rica Dissertation: Biological processes influencing nutrient limitation in a tropical wet forest

美国-哥斯达黎加论文：影响热带湿森林养分限制的生物过程

• 批准号: 0840298
• 负责人: Michelle Mack
• 金额: $ 1.5万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0840298&HistoricalAwards=false
• 关键词: US; Costa; Rica; Dissertation; Biological

This award to Dr. Michelle Mack at the University of Florida supports graduate student Silvia Alvarez-Clare to conduct doctoral dissertation research at EARTH University Forest Reserve in Costa Rica. Ms. Alvarez-Clare will be supervised in Costa Rica by Dr. Ricardo Russo from EARTH University. Ms. Alvarez-Clare's investigation will focus on the biological processes influencing nutrient limitation in a tropical wet forest. Specifically, the proposed study will (1) directly test if nitrogen, phosphorus, or a combination of N and P, limit tree biomass production and litterfall decomposition in a lowland diverse tropical wet forest; (2) investigate how the plant community as a whole influences plant-soil-microbial-feedbacks and thereby nutrient limitation; and (3) explore the mechanisms by which an increase in nutrient availability mitigates or reinforces nutrient limitation in a diverse forest with plant and microbial communities adapted to low nutrient concentrations. This potentially transformative research will supply much needed information on tropical forest productivity and nutrient cycling, specifically how tree species composition and demographic stages influence ecosystem nutrient dynamics. Additionally, the research will provide a scientific baseline for future policy and management decisions regarding tropical forest resources.

该奖项授予佛罗里达大学的Michelle Mack博士，支持研究生Silvia Alvarez-Clare在哥斯达黎加的地球大学森林保护区进行博士论文研究。 阿尔瓦雷斯-克莱尔女士将在哥斯达黎加由地球大学的里卡多·鲁索博士监督。 Alvarez-Clare女士的调查将侧重于影响热带潮湿森林养分限制的生物过程。 具体而言，拟议的研究将（1）直接测试氮，磷，或N和P的组合，限制树木生物量的生产和凋落物分解在一个低地多样化的热带潮湿森林;（2）调查植物群落作为一个整体如何影响植物-土壤-微生物-反馈，从而养分限制;以及（3）探索在具有适应低养分浓度的植物和微生物群落的多样化森林中，养分可利用性的增加减轻或加强养分限制的机制。 这项潜在的变革性研究将提供有关热带森林生产力和养分循环的急需信息，特别是树种组成和人口阶段如何影响生态系统养分动态。 此外，这项研究将为今后有关热带森林资源的政策和管理决定提供科学基线。