年轮数据提供了管理线索,并精确定位了两种miombo树(Brachystegia spiciformis,Julbernardia paniculata)生长的气候驱动因素

IF 2.7 3区 农林科学 Q1 FORESTRY Dendrochronologia Pub Date : 2023-10-01 DOI:10.1016/j.dendro.2023.126117
Abilio Santos-Malengue , David Ariza-Mateos , Rafael Navarro-Cerrillo , Antonio M. Cachinero-Vivar , J. Julio Camarero
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引用次数: 0

摘要

热带非洲森林的树木年轮研究仍然缺乏。这就是位于非洲南部季节性干旱的miombo森林的情况。在安哥拉的miombo,由于木炭的大量开采,迫切需要树木年轮数据来估计达到最小允许砍伐直径的年龄。此外,还必须研究气候-生长关系,以了解主要树种如何响应气候约束和远相关,如厄尔Niño南方涛动(ENSO)。为了实现这两个目标,我们使用树木年代学方法研究了两种miombo树豆科植物(Brachystegia spiciformis, Julbernardia paniculata)在安哥拉湿地(Bailundo)和干地(Caála)的径向生长数据。两种都有弥散多孔的木材和明显的环状边界,由晚期木材的顶生薄壁组织所划分。干地和湿地取样个体年龄(1.3 m)在28 ~ 34岁之间,环宽分别为3.8 ~ 4.3 mm和5.5 ~ 6.0 mm。在湿(干)地,Brachystegia和Julbernardia在12(14 ~ 20)岁时直径增长量最大,为1.05 ~ 1.32 (0.74 ~ 0.91)cm yr - 1。这两个物种都需要12-15年才能达到15厘米的最小切割直径。同种个体间的生长变异性在干地(平均标准误差1.4 cm)低于湿地(平均标准误差2.7 cm)。我们还发现,从11月到2月的潮湿条件,通常与El Niño事件有关,促进了两种物种的生长,个体之间的生长一致性更强,对干燥地点的气候更敏感。这些信息可能有助于估计最小切割直径的最佳年龄,以保证木炭和薪材的可持续使用。
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Ring data provide management clues and pinpoint climate drivers of growth in two species of miombo trees (Brachystegia spiciformis, Julbernardia paniculata)

Tree-ring studies are still lacking in tropical African forests. This is the case in the seasonally dry miombo forests located in Southern Africa. In the Angolan miombo, subject to intense charcoal exploitation, tree-ring data is urgently needed to estimate the age at which the minimum permitted cutting diameter is reached. Further, climate-growth relationships must be also investigated to understand how major miombo tree species respond to climate constraints and teleconnections such as the El Niño Southern Oscillation (ENSO). To achieve both aims, we studied radial growth data of two miombo tree legume species (Brachystegia spiciformis, Julbernardia paniculata) in wet (Bailundo) and dry (Caála) Angolan sites using dendrochronological methods. Both species have diffuse porous wood and conspicuous ring boundaries delimited by terminal parenchyma in latewood. Sampled individuals had ages (at 1.3 m) between 28 and 34 years with ring widths ranging 3.8–4.3 and 5.5–6.0 mm in dry and wet sites, respectively. In the wet (dry) site, Brachystegia and Julbernardia reached maximum diameter increment rates of 1.05–1.32 (0.74–0.91) cm yr−1 at an age of 12 (14−20) years. Both species took 12–15 years to reach a minimum cutting diameter of 15 cm. The growth variability among conspecific individuals was lower in the dry (mean standard error, 1.4 cm) than in the wet site (mean standard error, 2.7 cm). We also found that wet conditions from November to February, often linked to El Niño events, enhanced growth for both species, with greater growth consistency among individuals and higher sensitivity to climate found in the dry site. This information may help to estimate the optimal age for minimum cutting diameter that guarantees the sustainable use of charcoal and fuelwood.

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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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