Collaborative Research on Biogeochemistry of Antarctic Dry Valley Lakes: Seasonality and Feedback Processes in Amictic Lakes Dominated by Internal Cycling

南极干谷湖泊生物地球化学合作研究：以内循环为主的非密克湖的季节性和反馈过程

• 批准号: 8817113
• 负责人: Diane McKnight
• 金额: --
• 依托单位: Geological Survey-Denver
• 依托单位国家: 美国
• 项目类别: Interagency Agreement
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1990-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817113&HistoricalAwards=false
• 关键词: Collaborative; Research; Biogeochemistry; Antarctic; Dry

Lake ecosystems in temperate zones are influenced both by seasonally-varying external forces and by internal biogeochemical cycling; however, hydrologic mixing and dilution may obscure the importance of some biogeochemical processes. In contrast, lakes in the Dry Valleys of Antarctica are influenced by a seasonality that is simple in the extreme, are stabilized by a permanent ice cover, and receive proportionately minor annual inputs of chemical constituents, including organic material and nutrients, from glacial meltwater streams. Therefore, these lakes are uniquely suited for the study of processes involved in the internal production and degradation of organic material. This study will focus on the chemical and biological changes occurring during the austral winter (constant darkness) and the austral summer (constant daylight) and on the interaction or feedback mechanisms between processes occurring in major zone of these lakes. The study will be accomplished by measuring key autotrophic and heterotrophic processes and related chemical parameters, by quantifying lake hydrology and by deploying sampling devices to operate during the winter. Knowledge of these lake ecosystems will enhance our understanding of internal biogeochemical cycling in other lakes.

温带地区的湖泊生态系统受到季节性的外力和内部生物地球化学循环的影响。但是，水文混合和稀释可能会掩盖某些生物地球化学过程的重要性。 相比之下，南极干山谷中的湖泊受到极端简单的季节性的影响，由永久性冰盖稳定，并接受了化学成分的年度较小的年度输入，包括有机材料和营养，从冰川融合流中，包括有机材料和营养素。 因此，这些湖泊非常适合研究有机材料内部生产和降解的过程。这项研究将重点介绍在澳大利亚冬季（恒定的黑暗）和澳大利亚夏季（持续的日光）以及这些湖泊主要区域中发生的过程之间的相互作用或反馈机制。 该研究将通过测量关键的自养和异养过程以及相关的化学参数来完成，通过量化湖泊水文学和部署采样设备在冬季运行。 对这些湖泊生态系统的了解将增强我们对其他湖泊内部生物地球化学循环的理解。