气候变暖对喜马拉雅铁杉生长的影响对比:季节和海拔变化

IF 2.7 3区 农林科学 Q1 FORESTRY
Samresh Rai , Jan Altman , Martin Kopecký , Kristina Sohar , Pavel Fibich , Vít Pejcha , Jiří Doležal
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引用次数: 0

摘要

持续的气候变化可能对生长季节和海拔范围内的树木生长产生不同的影响,对森林生态系统功能和服务产生重要影响。然而,我们对这些对气候敏感的喜马拉雅森林的影响的了解仍然有限。在这里,我们探讨了海拔变化的气候因素驱动喜马拉雅铁杉(Tsuga dumosa)径向生长的长期变化,包括最近对喜马拉雅中部前所未有的气候变暖的响应。我们评估了几个生长参数,包括总环宽、早木宽度、调整后的晚木宽度和最大晚木密度。位于尼泊尔道拉吉里南坡海拔2500-3100米的400年历史的森林。研究结果表明,以气温升高和降水模式变化为特征的气候条件变化对高程边缘杉木生长的不利影响大于中高带杉木生长。具体而言,在低海拔地区,春季和秋季之前的增温共同限制了早木的生长,而夏末的增温则通过缓解高季风降水造成的凉爽生长限制条件,促进了中海拔地区的生长。此外,春季气温升高增加了晚木密度,而夏季变暖促进了高海拔晚木的生长。此外,我们观察到,最近秋季气温的上升已经开始阻碍所有海拔的Tsuga生长。综上所述,杉木生长受多种气候因子的影响,这些气候因子在不同的生长季节和不同的海拔范围内都有所不同。最近的春季变暖限制了低海拔地区的生长,而之前较高的秋季气温减少了该物种分布范围的高低边界的生长。这些发现有助于更好地理解气候变化和树木生长动态之间的复杂关系,特别是在脆弱的喜马拉雅森林中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Contrasting impacts of climate warming on Himalayan Hemlock growth: Seasonal and elevational variations

Ongoing climate change can have varying impacts on tree growth within the growing season and across their elevation ranges, with important implications for forest ecosystem functions and services. However, our knowledge of these effects on climate-sensitive Himalayan forests is still limited. Here, we explore the elevational changes in climatic factors driving long-term changes in the radial growth of Himalayan Hemlock (Tsuga dumosa), including recent responses to unprecedented climate warming in the central Himalayas. We evaluated several growth parameters, including total ring width, earlywood width, adjusted latewood width, and maximum latewood density, in unique > 400-year-old forests along an elevational gradient of 2500–3100 m on the southern slopes of Dhaulagiri, Nepal. Our findings show that changing climatic conditions, characterized by increasing temperatures and variable precipitation patterns, had a more detrimental effect on Tsuga growth at the edge of its elevation range compared to the optimal mid-elevation zone. Specifically, at lower elevations, the combination of spring and preceding autumn warming restricted earlywood growth, while warmer temperatures in late summer stimulated growth at the mid-elevation site by alleviating the cool growth-limiting conditions caused by high monsoonal precipitation. Furthermore, increased spring temperatures enhance latewood density, while summer warming promotes latewood growth at higher elevations. Additionally, we observed that the recent rise in autumn temperatures has begun to impede Tsuga growth across all elevations. In conclusion, our study reveals that the growth of Tsuga trees is influenced by multiple climatic factors that vary within the growing season and across different parts of its elevation range. Recent spring warming has constrained growth in lower elevations, while higher previous autumn temperatures have reduced growth at both higher and lower boundaries of the species' range. These findings contribute to a better understanding of the complex relationship between climate change and tree growth dynamics, particularly in vulnerable Himalayan forests.

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来源期刊
Dendrochronologia
Dendrochronologia FORESTRY-GEOGRAPHY, PHYSICAL
CiteScore
5.50
自引率
13.30%
发文量
82
审稿时长
22.8 weeks
期刊介绍: Dendrochronologia is a peer-reviewed international scholarly journal that presents high-quality research related to growth rings of woody plants, i.e., trees and shrubs, and the application of tree-ring studies. The areas covered by the journal include, but are not limited to: Archaeology Botany Climatology Ecology Forestry Geology Hydrology Original research articles, reviews, communications, technical notes and personal notes are considered for publication.
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