DISSERTATION RESEARCH: Nutrient Controls on Epiphyte Communities in Tropical Forests

论文研究：热带森林附生植物群落的养分控制

• 批准号: 0608499
• 负责人: Peter Vitousek
• 金额: $ 1.08万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0608499&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Nutrient; Controls; Epiphyte

Nitrogen supply frequently limits the forest productivity. Nitrogen-fixing lichens with a cyanobacterial photosynthetic partner (cyanolichens) growing as epiphytes in forest canopies have the potential to contribute significant amounts of nitrogen to forests, but the factors controlling their abundance are poorly understood. Long-term fertilization experiments in low-diversity Hawaiian montane rainforests indicate that epiphytic cyanolichens are most abundant and diverse when phosphorus supply to host trees is high, suggesting that soil phosphorus may indirectly determine epiphyte community composition and nitrogen inputs via canopy nitrogen fixation. The investigator will expand this research to investigate whether soil phosphorus also controls canopy epiphyte communities in highly diverse tropical forests on Mt. Kinabalu in Malaysian Borneo. This research will contribute towards understanding both the links between terrestrial soil and canopy processes and the role of canopy nitrogen fixation in whole-forest nutrient cycles.

氮供应经常限制森林生产率。 随着森林檐篷中的附生植物的生长，具有蓝细菌光合作用伴侣（氰基化）的固氮地衣有可能对森林贡献大量的氮，但是控制其丰度的因素知之甚少。 低多样性的夏威夷山地雨林中的长期施肥实验表明，当磷供应到宿主树时，附生的氰基化最丰富和多样化，这表明土壤磷可能会间接确定epiphyte社区组成和通过固定氮基因固定固定的氮组成和氮的输入。 研究人员将扩大这项研究，以调查土壤磷是否还控制马来西亚婆罗洲山地山上高度多样化的热带森林中的冠层附生植物群落。 这项研究将有助于理解陆地土壤和冠层过程之间的联系，以及固定氮气在全部森林营养周期中的作用。