Tree-ring based high-resolution temporal climate and environmental change in Corsica in the Late Holocene

基于树木年轮的全新世晚期科西嘉岛高分辨率时间气候和环境变化

• 批准号: 89926409
• 负责人: Professor Dr. Achim Bräuning
• 金额: --
• 依托单位: Institut für Geographie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/89926409?language=en
• 关键词: Tree; ring; based; resolution; temporal

A dendroclimatological and dendrochemical study on living Pinus nigra laricio trees in Corsica shall reveal the specie’s ecological response to climate change and climate differentiation at the timberline at annual resolution. The study will be based on ring width and latewood density measurements of a spatially dense sampling network. The oldest living trees sampled so far show up to 850 tree rings and are among the oldest in the western Mediterranean region. Due to the alignment along climatic gradients, the selected sites show different climatic sensitivity to cold, wet, warm and dry recent conditions and can thus represent regional climatic trends of different climatic variables. Stable oxygen and carbon isotope variability in wood cellulose will be measured at annual resolution at sites with time series of more than 520 years, spanning the major part of the Little Ice Age. Image analysis of variations of the tracheid properties will provide information about growth-controlling climate variations at an intra-annual scale and will supplement the interpretation of the density measurements. The spatial data achieved by tree material shall be compared with other climate proxies such as montane vegetation distribution, potential treeline position, temporary snowline (remote sensing data), and will be calibrated against data of modern isotopic composition of surface waters and maximum snowline depression. Corsica is located in a climatic key position in the track of Mediterranean cyclones. The study is dedicated to late Holocene mountain climatic change and will contribute new data of the Mediterranean area, which will be strongly affected by warming and drying in the next decades.

对科西嘉岛现存黑松的树木气候学和树木化学研究将揭示该物种对气候变化的生态响应和林线气候分异的年度分辨率。该研究将基于空间密集采样网络的年轮宽度和晚材密度测量。迄今为止采样的最古老的现存树木有多达 850 个年轮，属于西地中海地区最古老的树木之一，由于沿气候梯度排列，所选地点显示出不同的年轮。气候对寒冷、潮湿、温暖和干燥最近条件的敏感性，因此可以代表不同气候变量的区域气候趋势。将在时间序列超过 520 年的地点以年分辨率测量木材纤维素中的稳定氧和碳同位素变化，跨越小冰河时代主要部分的管胞特性变化的图像分析将提供有关年内控制生长的气候变化的信息，并将补充对密度测量获得的空间数据的解释。树木材料应与其他气候指标进行比较，例如山地植被分布、潜在林线位置、临时雪线（遥感数据），并将根据地表水的现代同位素组成数据和科西嘉岛最大雪线洼地进行校准。该研究致力于研究全新世晚期的强烈山地气候变化，并将贡献地中海地区未来受变暖和干燥影响的新数据。几十年。