Dissertation Research: Interactions of Controlled Nutrient Enrichment, Plant Growth, and Insect Herbivory in Red Mangrove (Rhizophora mangle)

论文研究：红树林（Rhizophora mangle）中受控养分富集、植物生长和昆虫食草的相互作用

• 批准号: 9001036
• 负责人: Edward Barrows
• 金额: $ 0.86万
• 依托单位: Georgetown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9001036&HistoricalAwards=false
• 关键词: Dissertation; Research; Interactions; Controlled; Nutrient

Primary productivity of mangroves is an important source of nutrients for adjacent marine systems. The level of productivity is affected not only by environmental factors but also by other components of the mangrove community. Nutrient enrichment might have direct impact on aquatic food webs by increasing primary productivity of mangroves, but enrichment to coastal waters might be mitigated because as much as 20% of mangrove leaf material is removed by herbivores. The objective of this study is to determine the effects of nutrient enrichment on primary productivity of the key mangrove species, Rhizophora mangle, and on rates of insect herbivory in a controlled experiment in which nutrient availability in sediment is manipulated. The following hypotheses will be tested: 1. Nutrient enrichment causes increased leaf production and terminal branch production, internodal elongation, and flowering. 2. Nutritional quality (e.g., CNP ratio, water content) of mangrove tissues increases following nutrient enrichment of the sediment. 3. Nutritional quality of mangrove tissues correlates with rates of insect herbivory by both leaf feeders (folivores) and twig borers (xylovores). 4. Secondary use of R. mangle twigs by insects and their kin, e.g., predators, parasites, twig-nesting ants, etc., increases with rate of primary herbivory. 5. Proportions of species in the twig-feeding guild of R. mangle change following nutrient enrichment. This research will contribute to the knowledge base on mangrove ecology and may provide important information useful in conservation of mangroves.//

红树林的初级生产力是森林资源的重要来源 为邻近的海洋系统提供养分。 生产力水平 不仅受环境因素的影响， 组成了红树林群落。 营养强化可能 对水生食物网产生直接影响， 红树林的生产力，但富集到沿海沃茨可能 因为多达20%的红树林叶材料 被食草动物吃掉 本研究的目的是 确定营养强化对初级 关键红树林物种红树林的生产力， 在一个对照实验中， 控制沉积物中的养分有效性。 以下 将检验假设： 1. 营养丰富导致叶产量增加， 顶生分支产生，节间伸长，和 开花 2. 营养质量（例如，CNP比率，含水量） 红树林组织增加后，营养丰富， 沉淀物。 3. 红树林组织的营养质量与 两种食叶动物（食叶动物）的昆虫食草率 和小树枝蛀虫（食木动物）。 4. 二次利用R。昆虫和它们的同类把树枝弄得乱七八糟， 例如，在一个实施例中，捕食者、寄生虫、树枝筑巢的蚂蚁等， 随着初级食草动物的比率增加而增加。 5. 取食团的种类比例; 在营养强化后的变化 本研究将有助于建立红树林的知识库 生态学，并可能提供有用的重要信息， 保护红树林。