Rapid Assessment of Recent Changes in Land Cover and Carbon Balance in Beringia

白令海峡土地覆盖和碳平衡近期变化的快速评估

• 批准号: 0454997
• 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: 2005
• 资助国家: 美国
• 起止时间: 2005-04-15 至 2009-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0454997&HistoricalAwards=false
• 关键词: Rapid; Assessment; Recent; Changes; Land

Funds are provided to develop and test a methodology for the rapid assessment of the patterns of decadal time scale land cover change at multiple sites throughout the Beringia region and to gauge the probable impact these changes have had on ecosystem carbon balance. The project is made possible by participation in the Swedish Beringia 2005 Expedition. Land cover change will be assessed at the plot level in collaboration with a Russian colleague who established marked plots throughout the region between 1984 and 1986. At the landscape level, land cover change will be assessed using modern high-spatial resolution satellite imagery to derive supervised land cover classifications that will be compared to land cover maps derived from newly archived historical air photos and/or recently declassified military spy imagery. Component land-atmosphere fluxes of carbon dioxide and methane will be measured in collaboration with a Swedish colleague in multiple land cover types at each site visited. Component fluxes will be extrapolated to the landscape level for each multi-temporal land cover assessment and the probable changes in carbon balance over time and space will be estimated. Monolith, soil, and vegetation samples will be collected for controlled laboratory experiments and analyses that will enable cross-site comparison of a range of biogeochemical processes.

提供资金用于制定和测试一种方法，以快速评估整个贝林贾地区多个地点的十年时间尺度土地复盖变化模式，并评估这些变化对生态系统碳平衡可能产生的影响。该项目是通过参加2005年瑞典Beringia探险队而得以实施的。将与一名俄罗斯同事合作，在地块一级评估土地复盖变化，这位同事在1984至1986年间在整个区域建立了标记地块。在景观一级，将使用现代高空间分辨率卫星图像评估土地覆盖变化，以得出受监督的土地覆盖分类，并将其与从新存档的历史航空照片和(或)最近解密的军事间谍图像得出的土地覆盖地图进行比较。将与一位瑞典同事合作，在访问的每个地点的多种土地覆盖类型下测量二氧化碳和甲烷的组成陆地-大气通量。各组成部分的通量将被外推到每一次多时相土地覆盖评估的景观水平，并将估计碳平衡随时间和空间的可能变化。将收集整体、土壤和植被样本，以进行受控的实验室实验和分析，从而能够对一系列生物地球化学过程进行跨地点比较。