Responses to drought of two Mediterranean ring-porous, deciduous species: Searching for climate smart trees and shrubs

IF 3.7 2区 农林科学 Q1 FORESTRY
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Abstract

Drought-tolerant tree species with high growth rates and a good capacity for carbon storage in woody tissues (dense wood) are searched for due to aridification. Deciduous, ring-porous tree and shrub species could show such drought tolerance and growth traits, thus representing good candidates for climate-smart rewilding. However, we still do not know the long-term growth rates of these species and how they respond to drought, particularly in climate change hotspots such as the Mediterranean Basin. We analysed these issues at the site and individual levels in two ring-porous, deciduous species (Pistacia terebinthus, Celtis australis) using dendroecology and wood anatomy. The ring width, earlywood vessel diameter, vessel density (VD) and area (%) were measured in two focal sites, one per species, and then growth data were compared with two secondary sites to test if site-to-site synchrony changed through time. Ring-width indices (RWI) and the hydraulic diameter (Dh) of earlywood were calculated. Growth rates (ring width), Dh and vessel area were higher in C. australis (1.03−2.26 mm, 269 μm, 33.9 %) than in P. terebinthus (0.57−0.72 mm, 146 μm, 21.5 %). Consequently, VD was higher in P. terebinthus than in C. australis (104 vs. 61 vessels mm−2). The ring width and Dh were more coupled in P. terebinthus (r = 0.43) than in C. australis (r = 0.32). RWI series of the focal and secondary sites have been synchronized since the 1990s as temperatures rose. Precipitation during the growing season (May, June) enhanced growth and VD of both species. P. terebinthus was more responsive to a drought index than C. australis. The two study species show high growth rates and tolerate drought being thus suitable candidates for climate-smart rewilding.

两种地中海环孔落叶树种对干旱的反应:寻找适应气候的乔木和灌木
由于干旱化,需要寻找生长速度快、木质组织(致密木材)碳储存能力强的耐旱树种。落叶、环状多孔的乔木和灌木物种可以表现出这种耐旱性和生长特性,因此是气候智能型野化的理想候选树种。然而,我们仍然不知道这些物种的长期生长速度以及它们如何应对干旱,尤其是在地中海盆地等气候变化热点地区。我们利用树木生态学和木材解剖学在两个环孔落叶树种(Pistacia terebinthus 和 Celtis australis)的地点和个体层面分析了这些问题。在两个重点地点测量环宽、早期木质部血管直径、血管密度(VD)和面积(%),每个物种一个地点,然后与两个次要地点的生长数据进行比较,以检验地点与地点之间的同步性是否随时间发生变化。计算环宽指数(RWI)和早期木材的水力直径(Dh)。生长率(环宽)、Dh 和血管面积在 C. australis(1.03-2.26 mm,269 μm,33.9%)高于 P. terebinthus(0.57-0.72 mm,146 μm,21.5%)。因此,布袋莲的 VD(104 艘 mm-2 对 61 艘 mm-2)高于奥斯特里斯(C. australis)。环宽和 Dh 在 P. terebinthus 中的耦合度(r = 0.43)高于 C. australis(r = 0.32)。自 20 世纪 90 年代以来,随着气温的升高,焦点和次要地点的 RWI 序列一直是同步的。生长季节(5 月和 6 月)的降水促进了两种植物的生长和 VD。与奥氏囊叶草相比,鹅掌楸对干旱指数的反应更为敏感。这两个研究物种生长速度快,耐干旱,因此是气候智能型野化的合适候选物种。
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来源期刊
Forest Ecology and Management
Forest Ecology and Management 农林科学-林学
CiteScore
7.50
自引率
10.80%
发文量
665
审稿时长
39 days
期刊介绍: Forest Ecology and Management publishes scientific articles linking forest ecology with forest management, focusing on the application of biological, ecological and social knowledge to the management and conservation of plantations and natural forests. The scope of the journal includes all forest ecosystems of the world. A peer-review process ensures the quality and international interest of the manuscripts accepted for publication. The journal encourages communication between scientists in disparate fields who share a common interest in ecology and forest management, bridging the gap between research workers and forest managers. We encourage submission of papers that will have the strongest interest and value to the Journal''s international readership. Some key features of papers with strong interest include: 1. Clear connections between the ecology and management of forests; 2. Novel ideas or approaches to important challenges in forest ecology and management; 3. Studies that address a population of interest beyond the scale of single research sites, Three key points in the design of forest experiments, Forest Ecology and Management 255 (2008) 2022-2023); 4. Review Articles on timely, important topics. Authors are welcome to contact one of the editors to discuss the suitability of a potential review manuscript. The Journal encourages proposals for special issues examining important areas of forest ecology and management. Potential guest editors should contact any of the Editors to begin discussions about topics, potential papers, and other details.
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