成熟的松树的干旱遗产可以缓解反复出现的干旱期间的生理压力
K Hikino1,2, B D Hesse1,3, T Gebhardt1,4
1School of Life Sciences, Land Surface-Atmosphere Interactions, Ecophysiology of Plants, Technical University of Munich, Freising, Germany.
Plant biology (Stuttgart, Germany)
|May 16, 2025
概括
森林显示了干旱遗产的积极影响. 以前的干旱暴露改善了树木对后来的干旱时期的弹性,通过减少用水量和增强土壤水分,有助于恢复.
科学领域:
- 森林生态 森林生态
- 干旱压力生理学 干旱压力生理学
背景情况:
- 森林生态系统面临长期干旱和延迟恢复,被称为"干旱遗产".
- 了解干旱遗产对于预测森林在气候变化中的性至关重要.
研究的目的:
- 调查长期实验干旱对树木对反复干旱的生理反应的积极遗留影响.
- 评估干旱引起的挪威杉变化如何影响混合森林环境中的欧洲.
主要方法:
- 一个混合的挪威杉和欧洲树森林经历了五年的实验性干旱 (2014年5月至2019年6月).
- 在2019年7月的实验性干旱释放之后,在2022年的自然干旱期间监测了生理反应.
- 测量了叶面积,早晨叶子的水潜力,叶子的气体交换和树脂液流密度.
主要成果:
- 在干旱后的4年里,挪威杉的叶面积持续减少了30%,导致用水量减少,土壤水量增加.
- 与对照组相比,遗留的杉树在2022年干旱期间显著减少了生理干旱压力.
- 邻近的树也受益于松树减少的用水量,表现出更好的生理干旱耐受性.
结论:
- 干旱后杉叶面积缓慢恢复起到有益的遗留效应,增强了对未来干旱事件的抵御力.
- 干旱遗留的积极影响可以改善水的供应,并减少干旱影响的树木和邻近物种的生理压力.
相关概念视频
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
25.0K
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.
25.0K
Responses 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
Responses to Salt Stress
12.9K
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.
12.9K
Regulation of Transpiration by Stomata
27.6K
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.
27.6K
Ecological Succession
17.1K
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
17.1K


