降水频率下降可能会导致叶子早衰,因为它会加剧干旱压力并增强干旱适应
Xinyi Zhang1,2,3, Xiaoyue Wang4,5, Constantin M Zohner6
1The Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101, Beijing, China.
Nature communications
|January 21, 2025
概括
降水频率的下降,而不仅仅是总量,可能会导致北半球的叶子更早下降 (叶子衰老). 当前的气候模型未能捕捉到这一关键联系,影响未来的气候变化预测.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 地球系统科学 地球系统科学
背景情况:
- 叶子衰老的时间影响着陆地生态系统的碳吸收.
- 降水频率在叶子衰老中的具体作用尚不清楚.
研究的目的:
- 调查降水频率对北半球叶子衰老日期的影响.
- 评估地球系统模型在模拟这种关系中的性能.
主要方法:
- 对长期碳流量数据和卫星观测 (1982-2022) 的分析.
- 部分相关性分析,将降水频率的影响与温度,辐射和总降水分隔开.
- 与30个最先进的地球系统模型进行比较.
主要成果:
- 降水频率的下降与其他气候因素考虑后更早的叶子衰老日期有关.
- 降水频率减少,通过土壤水分和大气干燥加剧干旱压力,限制光合作用.
- 增强的干旱适应机制有助于观察到的关系.
结论:
- 降水频率是叶子衰老时间的关键驱动因素,影响生态系统的碳循环.
- 地球系统模型需要纳入降水频率,以准确地预测现象学和气候变化.
- 目前的模型不充分反映了叶子衰老对降水频率变化的敏感性.
相关概念视频
01:57Adaptations 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
02:41Responses 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
02:45Responses to Heat and Cold Stress
13.3K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.3K
02:02Responses to Salt Stress
13.0K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.0K
02:04Regulation of Transpiration by Stomata
27.8K
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
27.8K
02:16Light Acquisition
8.4K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.4K