Salinity regulates radial growth of Cynometra ramiflora L. in the Sundarbans mangrove ecosystem

IF 2.7 3区 农林科学 Q1 FORESTRY
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Abstract

The mangrove biome is threatened by global environmental changes (including sea level rise, SLR) and anthropogenic disturbances. In this context, understanding the growth dynamics of mangrove species is essential for designing effective management plans for critical mangrove ecosystems such as the Bangladesh Sundarbans. Therefore, this study aims to (1) identify the growth-ring boundaries and tested their periodicity (annual nature) in one of the ecologically important understory mangrove species, Cynometra ramiflora in the Bangladesh Sundarbans, (2) determine the influences of climate and river discharge on radial growth, and (3) examine the influence of habitat variables (e.g., regulators, resources and forest structure) on radial growth. The growth-ring boundaries of C. ramiflora were distinct on the polished wood discs and marked by a layer of flattened fibers mixed with parenchyma. The agreement between individual growth-ring series and chronology statistics enabled us to develop for the first time a 42-year-long chronology spanning from 1979 to 2021. The results indicate that growth rings are annual and could be used for age and growth rate estimations. Monsoonal and annual precipitation enhanced radial growth. Growth was also positively influenced by the amount of river discharge received prior to the onset of growth, particularly during the pre-monsoon. Generalized additive models (GAMs) revealed that among the habitat variables, salinity had a strong negative influence on radial growth of the studied species in the Sundarbans, while tree density and diameter heterogeneity (coefficient of variation, CoV of diameter at breast height) had positive influences. This study revealed that C. ramiflora growth is strongly dependent on soil salinity and highlighted the potential of this approach for improving the prediction of future tree growth and distribution in the face of projected global changes, in particular, SLR.
盐度调节孙德尔本斯红树林生态系统中苎麻属植物的径向生长
红树林生物群落受到全球环境变化(包括海平面上升)和人为干扰的威胁。在此背景下,了解红树林物种的生长动态对于为孟加拉国孙德尔本斯等关键红树林生态系统设计有效的管理计划至关重要。因此,本研究旨在:(1)确定孟加拉国孙德尔本斯具有重要生态意义的底层红树林物种之一 Cynometra ramiflora 的生长环边界并测试其周期性(年度性);(2)确定气候和河流排水量对径向生长的影响;以及(3)研究生境变量(如调节器、资源和森林结构)对径向生长的影响。在打磨过的木盘上,苧麻的生长环边界明显,并有一层扁平的纤维与实质混合在一起。单个生长年轮序列与年轮统计之间的一致性使我们首次建立了从 1979 年到 2021 年的 42 年年轮。结果表明,生长年轮是年轮,可用于年龄和生长率的估算。季风和年降水量促进了径向生长。生长还受到生长开始前,特别是季风前的河流排水量的积极影响。广义加法模型(GAMs)显示,在生境变量中,盐度对所研究物种在孙德尔本斯的径向生长有很大的负面影响,而树木密度和直径异质性(胸径变异系数)则有正面影响。这项研究揭示了苧麻的生长在很大程度上依赖于土壤盐度,并强调了这种方法在面对预计的全球变化(尤其是可持续土地退化和干旱)时改善未来树木生长和分布预测的潜力。
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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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