A rapid assessment technique for quantifying change in land cover and carbon balance in arctic tundra

量化北极苔原土地覆盖变化和碳平衡的快速评估技术

• 批准号: 0435669
• 负责人: Patrick Webber
• 金额: --
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0435669&HistoricalAwards=false
• 关键词: rapid; assessment; technique; quantifying; change

Funds are provided to develop and verify a technique to rapidly assess decadal-scale change in land cover and carbon balance in arctic tundra. Recent and persistent changes in climate in the Arctic are amongst the most dramatic on the globe. Understanding how changes in ecosystem productivity interact and potentially offset the balance and stability of the Arctic soil carbon reservoir is of utmost importance to global change science. Subtle changes in plant species and communities, which underlie land cover change, have increasingly been related to dramatic shifts in ecosystem function, such as the exchange of carbon across the land-atmosphere boundary. Land cover change represents a time-integrated response and shift in the competitive interaction between species responding to an altered biological, chemical and/or physical state. This project will utilize newly acquired satellite imagery to derive extant land cover maps and retrospectively construct land cover maps from historical air photos and declassified military spy imagery. Empirical spatially, and land cover, explicit models of ecosystem carbon balance will be run over the time series of land cover maps to indicate probable decadal-scale changes in carbon balance. Ground truth for derived products will result from observations at the former site of the International Biological Program near Barrow, which remains relatively intact and where an extensive research history of decadal-scale changes in ecosystem structure and function exists.

提供资金用于开发和验证一种快速评估北极苔原土地覆盖和碳平衡十年尺度变化的技术。 北极最近和持续的气候变化是地球仪上最引人注目的变化之一。 了解生态系统生产力的变化如何相互作用并可能抵消北极土壤碳库的平衡和稳定性，对全球变化科学至关重要。 植物物种和群落的微妙变化是土地覆被变化的基础，这些变化越来越多地与生态系统功能的急剧变化有关，例如陆地-大气边界的碳交换。 土地覆被变化是一种随时间变化的反应，是物种之间因生物、化学和/或物理状态改变而产生的竞争性相互作用的变化。该项目将利用新获得的卫星图像绘制现有的土地覆盖图，并根据历史航空照片和解密的军事间谍图像追溯性地绘制土地覆盖图。生态系统碳平衡的经验空间和土地覆盖明确模型将在土地覆盖图的时间序列上运行，以表明碳平衡可能的十年尺度变化。衍生产品的地面实况将来自巴罗附近的国际生物方案旧址的观测，该遗址仍然相对完整，并且在生态系统结构和功能的十年尺度变化方面存在广泛的研究历史。