Belowground C Sources and Sinks in Arctic Tundra Ecosystems

北极苔原生态系统中的地下碳源和汇

• 批准号: 9615942
• 负责人: Knute Nadelhoffer
• 金额: $ 47.8万
• 依托单位: Marine Biological Laboratory
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615942&HistoricalAwards=false
• 关键词: Belowground; Sources; Sinks; Arctic; Tundra

ABSTRACT OPP 9615942 NADELHOFFER MARINE BIOLOGICAL LABORATORY This project is designed to characterize climatic and environmental controls on carbon inputs to tundra soils from belowground sources and on carbon balances in tundra soils. Specific objectives of this project include 1) quantifying root production and root-derived carbon fixation in wet sedge tundra, 2) assessing how global change influences both rates of carbon inputs from belowground sources to soils and the fate of these carbon inputs in arctic ecosystems, and 3) characterizing the fluxes of root-derived carbon across the soil-water-atmosphere interface under current and projected climatic conditions. The carbon-labeled experiments proposed here will permit measurements of plant carbon allocation to belowground production, fine root turnover, rates of carbon transfer from plants to soil and atmospheric pools, and rates of soil carbon turnover over timescales of days to years. Without such research on belowground carbon dynamics, it will be difficult to develop realistic predictions of arctic ecosystem responses to climate and environmental change.

摘要 OPP 9615942 NADELHOFFER 海洋生物实验室 该项目旨在表征对地下来源向苔原土壤的碳输入以及苔原土壤碳平衡的气候和环境控制。 该项目的具体目标包括 1) 量化湿莎草苔原中的根系生产和根系碳固定，2) 评估全球变化如何影响从地下来源到土壤的碳输入速率以及这些碳输入在北极生态系统中的命运， 3) 表征在当前和预计的气候条件下穿过土壤-水-大气界面的根源碳通量。 这里提出的碳标记实验将允许测量植物碳分配到地下生产、细根周转、从植物到土壤和大气池的碳转移速率以及数天到数年时间尺度上的土壤碳周转率。 如果没有对地下碳动态的研究，就很难对北极生态系统对气候和环境变化的反应做出现实的预测。