当地和区域气候对林木线附近灌木和乔木生长的制约因素

IF 2.7 3区 农林科学 Q1 FORESTRY
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引用次数: 0

摘要

许多林木线和灌木线对气候变暖的反应没有预期的那么快。在树木和灌木分布的寒冷边缘运行的其他非热气候驱动因素可以解释这种缺乏响应的现象。为了确定林木和灌木在林线附近径向生长的主要气候驱动因素,我们测量了林环宽度,并将其与气候变量(温度、降水、积雪深度)和植被绿度(归一化差异植被指数 NDVI)联系起来。我们比较了在三个树线地点采样的两种矮灌木(Vaccinium uliginosum、Dryas octopetala)和三种树种(Larix sibirica、Picea obovata、Pinus uncinata):极地或北乌拉尔山脉、南乌拉尔山脉和西班牙比利牛斯山脉。矮小灌木的一阶自相关性(AR1)低于乔木,乌拉尔北部地区除外。在该地,V. uliginosum呈现负增长趋势,而在乌拉尔南部和比利牛斯地区,P. obovata和P. uncinata树木也分别呈现负增长趋势。灌木和树木的生长指数与不同月份的归一化差异植被指数相关。在乌拉尔北部和南部,树木对较暖的夏季条件表现出较强的正生长反应,而对降水则表现出负生长反应。比利牛斯山脉的八爪金龙(D. octopetala)的生长受前冬和今春降水的影响,与五月积雪深度有很强的相关性(r = 0.66,p = 0.0006,1998-2020 年)。在林线附近共存的矮小灌木和乔木对区域气候变化的反应不同。我们的研究结果表明,灌木和乔木分别对当地气候条件(如积雪深度)和区域气候条件(如生长季气温)具有很强的依赖性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Local and regional climatic constraints of shrub and tree growth near the treeline

Many treeline and shrublines are not responding to climate warming as fast as expected. This lack of responsiveness could be explained by other non-thermal, climate drivers operating at the cold edge of distribution of trees and shrubs. To determine which are the main climate drivers of tree and shrub radial growth near the treeline we measured ring width and related it to climate variables (temperature, precipitation, snow depth) and vegetation greenness (NDVI, Normalized Different Vegetation Index). We compared two dwarf shrub (Vaccinium uliginosum, Dryas octopetala) and three tree species (Larix sibirica, Picea obovata, Pinus uncinata) sampled in three treeline sites: Polar or Northern Urals, Southern Urals, and Spanish Pyrenees. Dwarf shrubs presented lower first-order autocorrelation (AR1) than trees, excepting in the N. Urals site. In this site, V. uliginosum showed a negative growth trend, whereas this tendency was observed in P. obovata and P. uncinata trees from the S. Urals and Pyrenees sites, respectively. Shrub and tree growth indices correlated with NDVI at different months. Trees showed stronger and positive growth responses to warmer summer conditions and also negative responses to precipitation in the N. and S. Urals. The growth of D. octopetala in the Pyrenees was enhanced by prior-winter and current-spring precipitation showing a strong correlation with May snow depth (r = 0.66, p = 0.0006, period 1998−2020). Dwarf shrubs and trees coexisting near the treeline differently responded to regional climate variability. Our findings indicate a strong dependence of shrubs and trees on local (e.g., snow depth) and regional (e.g., growing-season air temperature) climate conditions, respectively.

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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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