SGER: Short- and Long-Term Effects of Hurricane Opal on a Forest Ecosystem

SGER：飓风蛋白石对森林生态系统的短期和长期影响

• 批准号: 9615661
• 负责人: Mark Hunter
• 金额: $ 2.5万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-15 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615661&HistoricalAwards=false
• 关键词: SGER; Short; Long; Term; Effects

9615661 Hunter This project will investigate the short term effects of Hurricane Opal on ecosystem processes at the Coweeta LTER site, North Carolina. The hurricane was a rare and dramatic event that resulted in considerable deposition of woody detritus and green leaves on the forest floor. The rare nature of this event, and the need to initiate studies of its effects as soon as possible, make this research well suited for SGER funding. This research will investigate the short-term effects of hurricane-derived greenfall on nutrient availability and decomposition processes on the forest floor. The investigators will test the prediction that loss of green leaf tissue from hurricane Opal will influence the carbon-nutrient balance of trees because nutrients were not resorbed for internal recycling prior to senescence. Rather, nutrients were lost to the forest floor. The nutrient stress caused by the loss of green tissue may result in high carbon:nutrient ratios in trees, and the allocation of carbon to tannins and other polyphenols instead of allocation to growth. This allocation of carbon to defenses may influence the subsequent quality of leaf tissue for herbivores, and levels of defoliation in the forest canopy. This project represents a unique opportunity to study the effects of altered ecosystem processes on plant physiology and plant herbivore dynamics following an extreme climatic event.

9615661 Hunter这个项目将调查飓风蛋白石对北卡罗来纳州Coweeta lter遗址生态系统过程的短期影响。飓风是一个罕见而戏剧性的事件，导致森林地面上的木质碎屑和绿色叶子大量沉积。该事件的罕见性质以及尽快启动其影响的需求，使这项研究非常适合SGER资金。 这项研究将研究飓风衍生的绿化对森林地面营养物的可用性和分解过程的短期影响。研究人员将测试这样的预测，即飓风蛋白石中绿叶组织的损失会影响树木的碳含量平衡，因为在衰老之前没有养分以进行内部回收。相反，营养物质丢给了森林地面。绿色组织损失引起的营养应激可能导致碳较高：树木的养分比，以及碳与单宁和其他多酚的分配，而不是分配给生长。将碳分配给防御能力可能会影响食草动物的随后的叶片组织质量，以及森林冠层的脱叶水平。 该项目代表了研究改变生态系统过程对植物生理学的影响和植物生物动态的独特机会。