三种主要的北极树种目前和未来的干旱脆弱性
Jorge Aldea1,2, Jonas Dahlgren3, Emma Holmström1
1Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Lomma, Sweden.
Global change biology
|January 26, 2024
概括
气候变化增加了北极森林的干旱风险. 挪威杉和树面临更高的脆弱性,而苏格兰松可能会受益于更温暖的冬季,需要适应性森林管理策略.
科学领域:
- 林业科学 林业科学
- 适应气候变化 适应气候变化
- 生态生态学 生态生态学
背景情况:
- 气候变化正在加剧干旱,威胁北极森林的健康,增加树木死亡率.
- 对森林应对气候变化的准确预测对于有效的森林管理和适应战略至关重要.
研究的目的:
- 确定影响瑞典北极森林干旱损害风险的关键因素.
- 在各种气候变化情景下预测干旱损害风险的未来时空演变.
主要方法:
- 利用了来自挪威杉,苏格兰松和瑞典树 (2010-2018) 的16455个核心的树环宽度时间表.
- 采用随机森林机器学习算法来识别干旱损害的预测变量.
- 基于1960-2010年间的生长异常计算的干旱损害风险和使用RCP排放场景 (2040-2070) 预测的未来风险.
主要成果:
- 当地气候变量是干旱损害风险的最重要的预测因素,站立竞争也发挥了作用.
- 挪威杉在瑞典南部表现出高度干旱的脆弱性,预计随着春季气温的上升而大幅扩大.
- 预计由于年气温升高,瑞典北部和中部的树对干旱的脆弱性将增加.
- 苏格兰松树干旱损害风险与寒冷的冬季和早春有关,这表明随着气候变暖,风险可能会降低.
结论:
- 森林管理策略应包括活跃物种的选择和促进多样化的物种混合物,以增强抗旱能力.
- 通过稀薄等方法减少树木竞争是适应北极森林增加干旱压力的有希望的方法.
- 了解物种对气候变化的反应对于北极森林生态系统的长期可持续性至关重要.
相关概念视频
Responses to Drought and Flooding
10.7K
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.
10.7K
Threats to Biodiversity
22.3K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
22.3K
Adaptations that Reduce Water Loss
25.6K
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.
25.6K
Survival Tree
86
Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
Building a Survival Tree
Constructing a...
Building a Survival Tree
Constructing a...
86
Softwoods and Hardwoods
165
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
165
Conservation of Declining Populations
9.6K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
9.6K


