SGER: Assessing Nutrient Limitation of Phytoplankton Photosynthesis

SGER：评估浮游植物光合作用的营养限制

• 批准号: 9300491
• 负责人: Richard Geider
• 金额: $ 5万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-11-15 至 1994-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9300491&HistoricalAwards=false
• 关键词: SGER; Assessing; Nutrient; Limitation; Phytoplankton

This project examines the applicability of a newly developed bio- optical instrument (pump and probe fluorometer) that may be able to measure the "health" of oceanic phytoplankton. In theory, this instrument provides a means for non-destructive measurement of phytoplankton photosynthesis without recourse to calibration against standard biological measurements. The technique, if successfully proven, will be able to establish the nutrient status of phytoplankton from measurements of photosynthetic efficiency. Present studies indicate that photosynthetic efficiency of phytoplankton is independent of temperature and irradiance under nutrient replete conditions, but decreases under nutrient limitation. This project is designed to thoroughly test the instrument under controlled laboratory conditions using three different species of phytoplankton whose growth rates are controlled by limiting nitrate, phosphate, silicate, and iron. Such information is crucial to the development of a quantitative understanding of environmental regulation of primary productivity in the sea.

该项目研究了新开发的生物- 光学仪器（泵和探针荧光计）可能能够 测量海洋浮游植物的“健康状况”。 理论上这 仪器提供了一种非破坏性测量的方法， 浮游植物光合作用无需校准 与标准的生物测量结果进行对比。 技术，如果 成功证明，将能够建立营养状况 浮游植物的光合效率。 目前的研究表明， 浮游植物不受温度和光照的影响， 在营养充足的条件下， 限制. 该项目旨在彻底测试 仪器在受控的实验室条件下使用三个 不同种类的浮游植物，它们的生长速度 通过限制硝酸盐、磷酸盐、硅酸盐和铁来控制。 这些信息对于定量分析的发展至关重要。 初级生产力的环境调节认识 在海里。