Functional differentiation among 12 dipterocarp species under contrasting water availabilities in Northeast Thailand
Functional differentiation among 12 dipterocarp species under contrasting water availabilities in Northeast Thailand
复制标题
泰国东北部水资源对比下 12 种龙脑香科植物的功能分化
DOI：
10.1139/cjb-2020-0155
复制
发表时间：
2021
期刊：
影响因子：
1.1
通讯作者：
Okada Naoki
中科院分区：
文献类型：
--
作者：
Kawai Kiyosada;Waengsothorn Surachit;Leksungnoen Nisa;Okada Naoki
物种组成变化很大，取决于水的可用性梯度。在泰国东北部，由于土壤结构和水分的差异，干燥落叶林（DDF）和干燥万年青林（DEF）显示出对比鲜明的物种组成。虽然植物性状（生理和形态特征）是已知的物种分布，这些不同的分布（无论是干DDF或不太干DEF）的特征的基础仍然不清楚。在这里，我们研究了21个叶片和茎性状之间的差异DDF和DEF使用12个龙脑香品种。结果表明，DDF品种叶片和叶柄的水分利用效率和贮水量均高于DEF品种，叶片氮含量和气孔密度均高于DEF品种，叶片较大，叶肉层较厚，严重脱水时失水速率也高于DEF品种。叶片渗透势在充分膨压，木材密度，木材含水量之间没有显着差异DDF和DEF。我们还观察到潜在的光合能力和严重脱水过程中的失水速率跨物种之间的负相关关系。我们的研究结果表明，与光合作用和脱水回避树种之间的差异产生生态位差异沿着在热带干旱森林的土壤水分有效性。
Species composition varies greatly dependent on water availability gradients. In Northeast Thailand, dry deciduous forests (DDF) and dry evergreen forests (DEF) show contrasting species composition due to differences in soil structure and moisture. Although plant traits (physiological and morphological characteristics) are known to be involved in species distributions, which traits underpin these distinct distributions (either dry DDF or less-dry DEF) remain unclear. Here, we examined the differentiation of 21 leaf and stem traits between DDF and DEF using 12 dipterocarp species. We found that DDF species showed higher water use efficiency and higher water storage capacity in the lamina and petiole, higher leaf nitrogen content, higher stomatal density, larger leaves, thicker mesophyll layers, and a higher rate of water loss under severe dehydration than DEF species. Leaf osmotic potential at full turgor, wood density, and wood water content were not significantly different between DDF and DEF. We also observed a negative relationship between the potential photosynthetic capacity and the water loss rate during severe dehydration across species. Our results suggest that the differences in leaf traits related to photosynthesis and dehydration avoidance among the tree species produce niche differences along the soil water availability in tropical dry forests.