Leaf phenology and trunk growth of Avicennia alba(Blume) under a seasonally fluctuating saline environment in the tropical monsoon area of eastern Thailand
Leaf phenology and trunk growth of Avicennia alba(Blume) under a seasonally fluctuating saline environment in the tropical monsoon area of eastern Thailand
复制标题
泰国东部热带季风区季节波动盐分环境下白骨壤叶片物候及树干生长
DOI：
10.1111/1440-1703.12251
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发表时间：
2021
影响因子：
2
通讯作者：
Chadtip Rodtassana and Tamanai Pravinvongvuthi
中科院分区：
文献类型：
--
作者：
Piyapon Kankong;Sasitorn Poungparn;Akira Komiyama;Chadtip Rodtassana and Tamanai Pravinvongvuthi
红树林被认为是高生产力的生态系统，但目前还不清楚它们是如何在热带季风区盐环境的波动下保持高生产力的。对与红树林生长相关的物候方面的研究可能是这一点的支持性证据。在这里，我们研究了季节性变化的叶物候和树干生长ofAvicennia albatrees在热带季风红树林森林，有明确的雨季和旱季在泰国东部的达叻府。对于叶物候，通过使用人口统计学技术计算新叶和落叶的数量，并从2019年6月至2020年5月的45个样本枝条中计算出每月的出叶率和落叶率。在此期间，树干断面积增量也记录每月使用测树带。出叶率呈明显的雨季高、旱季低的季节变化规律。月出叶速率与树干生长量呈显著正相关，说明无论是叶片还是树干生长量，都是一个重要的生长因子。alba对土壤中不断变化的水盐度有反应。然而，叶片损失率在整个研究期间波动。认为在热带雨季低盐环境下，与新叶形成相关的树干生长形成层活动促进了树木的生长。探讨了在盐量波动环境下潮间带生长的红树林的生长策略。
Mangrove forests are said to be highly productive ecosystems but it is unclear how they maintain high productivity under the fluctuation of saline environment in the tropical monsoon region. A study of phenological aspects linked with the growth of mangrove trees may be a supportive evidence for this. Here, we studied the seasonal variation in leaf phenology and trunk growth ofAvicennia albatrees in a tropical monsoon mangrove forest which has clear rainy and dry seasons at Trat Province, eastern Thailand. For the leaf phenology, the number of new and lost leaves was counted by using demographic techniques, and the monthly rates of leaf emergence and loss were calculated from 45 sample shoots from June 2019 to May 2020. In this period, trunk basal‐area increments were also recorded monthly by using dendrometer bands. The rate of leaf emergence showed a remarkable seasonal pattern that was high during the rainy season and low during the dry season. The monthly rate of leaf emergence and trunk growth showed a positive relationship, indicating that both the leaf and trunk growth ofA. albaresponded to the changing water salinity in the soil. However, the leaf loss rate fluctuated throughout the study period. It was considered that the cambial activity of trunk growth associated with new leaf formation stimulates tree growth under the low saline environment during the rainy season in the tropics. We discussed a growth strategy that will benefit mangrove trees growing in the intertidal areas under fluctuated saline environment.