来自东欧的树环碳稳定同位素揭示了沿海拔梯度的显著干旱信号
Irena Sochová1, Tomáš Kolář1, Eva Koňasová1
1Department of Wood Science and Technology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemědělská 3, 613 00 Brno, Czech Republic; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 4a, 603 00 Brno, Czech Republic.
The Science of the total environment
|October 30, 2024
概括
来自斯洛伐克树的树环稳定同位素 (TRSI) 和树环宽度 (TRW) 显示出明显的干旱信号. 这些气候代理显示出高度之间强烈的连贯性,表明东欧具有重要的古气候潜力.
科学领域:
- 古气候学 古气候学
- 同位素地球化学 同位素地球化学
- 登德罗年代学 登德罗年代学
背景情况:
- 树环中的稳定同位素 (TRSI) 对于气候重建至关重要,特别是在树环宽度 (TRW) 不可靠的地方.
- 高度对TRSI气候信号的影响尚不清楚.
- 树 (Quercus spp.) 是一种树. 由于它们的长寿性质,它们对古气候研究有价值.
研究的目的:
- 评估海拔高度如何影响树TRW, δ13C和 δ18O时间表中的降水和干旱信号.
- 确定斯洛伐克东部TRSI和TRW的古气候潜力.
- 调查不同海拔区气候信号的连贯性.
主要方法:
- 从斯洛伐克东部的五个海拔区域 (130630米) 收集了136个活树样本.
- 开发的树环宽度 (TRW) 和稳定同位素 (δ13C, δ18O) 时间表.
- 分析了整个海拔梯度对降雨和干旱的敏感性.
主要成果:
- 随着海拔的提高,δ13C值保持稳定,而TRW则下降,而δ18O值在较低和较高的地点之间存在显著差异.
- 在所有高度特定的TRW和TRSI年代表中观察到强烈的连贯性.
- TRW和δ13C主要反映了5月中旬至7月降水和5月中旬至8月干旱,而δ18O显示了较弱的气候信号.
- 在高海拔地区检测到稳定的干旱信号,高海拔地区的季节性响应窗口较短.
结论:
- 木TRW和碳TRSI时间表捕获了不同的夏季干旱信号,而不依赖于海拔.
- 这些发现凸显了木TRW和碳TRSI在重建东欧过去气候条件方面的显著古气候潜力.
- 稳定同位素提供了一个强大的代理干旱重建在不同地点条件的地区.
相关概念视频
Global Climate Change
24.2K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.2K
Responses to Drought and Flooding
10.6K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.6K
Adaptations that Reduce Water Loss
25.1K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.1K
The Carbon Cycle
37.1K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
37.1K
Ecological Disturbance
17.0K
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
17.0K
Xylem and Transpiration-driven Transport of Resources
23.5K
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
23.5K


