LTER Cross-Site: Interactions between Climate and Nutrient Cycling in Arctic and Subarctic Tundras

LTER 跨站点：北极和亚北极苔原气候与养分循环之间的相互作用

• 批准号: 0087046
• 负责人: Gaius Shaver
• 金额: $ 30万
• 依托单位: Marine Biological Laboratory
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-10-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0087046&HistoricalAwards=false
• 关键词: LTER; Cross; Site; Interactions; between

" LTER Cross site 2000: Interactions between climate and nutrient cycling in Arctic and Subarctic tundras"The proposed project would continue a long history of arctic ecosystem science by the PI and collaborators. The climate of high latitude ecosystems strongly limits the inputs and turnover of essential elements like N and P. The broad aims of this research are to: 1) improve understanding of the causes and consequences of variability in climate-nutrient interactions and in the availability and plant uptake of N and P among contrasting arctic and Subarctic tundra ecosystems and 2) to apply this understanding to better develop large-area, long-term predictions of their responses to climate change. The research will compare ecosystems at two sites: Abisko in Sweden and Toolik Lake in Alaska. The proposed work involves: two workshops focused on comparisons at the sties; field research on N and P turnover in soil, plant microbe interactions, and amino acid uptake; and modeling of primary production, biomass accumulation, and organic matter turnover. The new experimental component of the project includes a deeper examination of the importance of organic N uptake by arctic vegetation and extends many ongoing measurements to the "tails" of the growing season during which time there is indication of important, but previously under appreciated biological activity.

“LTER Cross site 2000：北极和亚北极冻土带气候与养分循环之间的相互作用“拟议的项目将延续PI和合作者长期从事北极生态系统科学的历史。高纬度生态系统的气候强烈限制了氮和磷等基本元素的输入和周转。1）提高对气候-养分相互作用以及对比鲜明的北极和亚北极苔原生态系统中氮和磷的可用性和植物吸收的可变性的原因和后果的理解，2）将这种理解应用于更好地开发大面积，对气候变化的长期预测。 这项研究将比较两个地点的生态系统：瑞典的阿比斯科和阿拉斯加的图里克湖。 拟议的工作包括：两个研讨会的重点是：猪舍的比较;土壤中氮和磷周转、植物微生物相互作用和氨基酸吸收的实地研究;初级生产、生物量积累和有机物周转的模型。 该项目新的实验部分包括对北极植被吸收有机氮的重要性进行更深入的研究，并将许多正在进行的测量扩展到生长季节的“尾部”，在此期间，有迹象表明存在重要但以前未得到重视的生物活动。