The role of iron in nitrogen fixation and photosynthesis in changing polar oceans

铁在极地海洋变化中固氮和光合作用的作用

• 批准号: 2892753
• 金额: --
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2892753
• 关键词: role; iron; nitrogen; fixation; photosynthesis

Iron is essential for marine primary production due to its enzymatic requirement in key metabolic functions such as photosynthesis, respiration and the acquisition of macronutrients such as nitrogen fixation [1]. Oceanic photosynthesis powers life in the oceans and is fundamental to the carbon-cycle and hence the climate [2]. In many parts of the ocean, particularly the Southern Ocean, iron availably limits the growth of phytoplankton. As the Arctic Ocean warms and becomes ice free, primary productivity, which underpins the entire Arctic ecosystem, has already increased, but the future trend is unclear due to the ongoing debate on Arctic micro-nutrient limitation and the imbalance in the Arctic nitrogen budget [3]. Nitrogen fixation, which has a large iron requirement may therefore be a critical source of nitrogen to sustain contemporary and future ocean productivity. We aim to carryout shipboard bioassays to investigate the role of iron for nitrogen fixation in the Arctic and to understand how iron, nutrients and light the iron-limited Southern Ocean. This project will provide important new insights into the role of iron in both nitrogen fixation and photosynthesis in a time when the climate is changing rapidly.

铁对于海洋初级生产至关重要，因为其在关键代谢功能（例如光合作用，呼吸和氮固定等大分子营养素的获取）中的酶促需求是必不可少的[1]。海洋光合作用为海洋的生命增强，是碳循环的基础，因此气候[2]。在海洋的许多地方，尤其是南大洋地区，铁可以限制浮游植物的生长。随着北极海洋的温暖并变得无冰，主要的生产力（支撑整个北极生态系统）已经增加，但是由于对北极微营养限制的持续辩论以及北极氮预算的不平衡，未来的趋势尚不清楚[3]。因此，氮固定的氮固定需要很大，因此可以是维持现代和未来海洋生产力的氮的关键来源。我们旨在携带船上的生物测定，以调查铁在北极中固定氮的作用，并了解铁，营养物质和点亮铁限制的南大洋。该项目将在气候迅速变化的时代，对铁在氮固定和光合作用中的作用中的作用提供重要的新见解。