Sapwood density underlies xylem hydraulics and stored carbohydrates across 13 deciduous tree species in a seasonally dry tropical forest in Thailand
Sapwood density underlies xylem hydraulics and stored carbohydrates across 13 deciduous tree species in a seasonally dry tropical forest in Thailand
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泰国季节性干燥热带森林中 13 种落叶树种的边材密度是木质部水力学和储存碳水化合物的基础
DOI：
10.1007/s00468-022-02364-3
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Ishida Atsushi
中科院分区：
文献类型：
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作者：
Kawai Kiyosada;Waengsothorn Surachit;Ishida Atsushi
关键messageSapwood密度是协调的水力能力和非结构性碳水化合物储备在木质部在季节性干燥的热带forest.AbstractSapwood密度（WD）是一个特征的分歧，在生活史策略之间的物种在季节性干燥的热带森林（SDTFs），因为WD是喜欢木质部的水力特性，通过其相关性与导管解剖，最大光合能力，和叶物候。然而，目前还不清楚如何在WD的差异有助于水的传导和非结构性碳水化合物（NSC）储备在旱季，木本植物的生理最严重的时期的分歧。我们假设，在干旱季节，重木质物种保持水分传导，光合作用，并在木质部高NSC储备的碳的易位。使用13个落叶树种的SDTF位于泰国东北部，我们调查了WD和树皮形态的变化在干旱后期的木质部的水力特性和NSC浓度。电导率（PLC）的百分比损失变化作为WD的二次函数：高PLC中观察到轻和重的树木种类。最大电导率与WD无关。PLC与树干木质部中可溶性糖和NSC的浓度呈负相关，这些关系强调了WD和NSC之间的负相关性。我们还发现，厚树皮的物种表现出相对较低的PLC，和密集树皮的物种表现出较高的NSC浓度在分支木质部，但他们的联系一般弱于WD。这些结果表明，物种水力学和NSC储备协调SDTF在旱季，WD这些分歧的基础。
Key messageSapwood density is coordinated with hydraulic capacity and non-structural carbohydrate reserves in xylem in the seasonally dry tropical forests.AbstractSapwood density (WD) is one characteristic underlying the divergence in life history strategies among species in seasonally dry tropical forests (SDTFs) since WD is liked to xylem hydraulic properties through its correlations with vessel anatomy, maximum photosynthetic capacity, and leaf phenology. However, it remains unclear how differences in WD contribute to the divergence in water conduction and non-structural carbohydrate (NSC) reserves during the dry season, the physiologically most severe period for woody plants. We hypothesized that heavy-wooded species maintain water conduction, photosynthesis, and translocation of carbon which result in high NSC reserves in xylem during the dry season. Using 13 deciduous tree species from a SDTF located in Northeast Thailand, we investigated the variation in WD and bark morphology in relation to hydraulic properties and NSC concentrations in xylem during the late-dry season. Percentage loss of conductivity (PLC) varied as a quadric function of WD: high PLC was observed in light- and heavy-wooded species. The maximum conductivity was not related to WD. The PLC was negatively related to the concentrations of soluble sugars and NSC in the trunk xylem, and these relationships underlined the negative association between WD and NSCs. We also found that species with thick bark showed relatively low PLC, and that dense-barked species exhibited higher NSC concentrations in branch xylem, but their linkages were generally weaker than WD. These results demonstrate that species hydraulics and NSC reserves are coordinated in SDTFs during the dry season, and that WD underlies these divergences.