| 摘要: |
| 以广西弄岗喀斯特季节性雨林33种优势树种为研究对象,解析植物气孔性状沿生境梯度的分异规律及其多维驱动机制。通过整合气孔性状、系统发育信号检测与环境因子建模,发现洼地、中坡和山顶生境间气孔配置策略存在显著分异特征。洼地植物气孔长度较大[(10.73±2.93 )μm]但密度较低[(327.82±163.50)个/mm2],山顶物种则表现出高气孔密度[(521.33±269.80)个/mm2]与开度(0.46±0.18),中坡生境呈现过渡性状特征。系统发育信号分析表明气孔大小(K=1.004)和密度(K=0.892)具有显著保守性,而气孔开度与气孔相对面积则呈现趋异进化模式。冗余分析结果表明,岩石裸露度(R2=0.61)与土壤总碳含量是驱动植物性状分异的核心环境因子；地形干燥指数则通过调控气孔形态权衡关系(气孔大小与密度呈显著负相关)影响植物水分利用策略。研究表明喀斯特植物通过"保守-分化"协同模式实现多维适应,系统发育历史与环境筛选共同塑造气孔性状的进化路径,为石漠化生态恢复中功能群配置与适应性管理提供理论依据。 |
| 关键词: 喀斯特季节性雨林,气孔性状,系统发育保守性,环境筛选,性状权衡 |
| DOI： |
| 投稿时间：2025-06-20修订日期：2025-06-08 |
| 基金项目: |
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| Divergence in Stomatal Traits Among Karst Seasonal Rainforest Tree Species and Their Underlying Drivers and Adaptive Significance |
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wangdenghui1, wangjing2, dongyanping3, 韦宇静1, nongzhengquan4, longjifeng4, wangbin1, lidongxing1
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| (1.Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences;2.Guilin University of Technology;3.Zhongshan County No.2 Middle School;4.Administration Center of Guangxi Nonggang National Nature Reserve) |
| Abstract: |
| We reveal multidimensional drivers of stomatal trait divergence in 33 dominant tree species across karst terrain in the Nonggang seasonal rainforest. Integrating morpho-anatomical, phylogenetic, and environmental analyses, three stomatal strategies emerged along elevation gradients: Depression species developed larger stomata (10.7 μm length) with lower density (328 mm?2), while summit specialists evolved high-density stomata (521 mm?2) with greater aperture plasticity. Phylogenetic analyses showed ancestral constraints on stomatal size (K=1.004) and density (K=0.892), but evolutionary lability in aperture regulation. Lithology (rock exposure) and soil carbon explained 68% of trait variation via topographic moisture gradients, enforcing key trade-offs (stomatal size-density: r=?0.79). We propose a dual-filter adaptation model: deep-time phylogenetic legacy shapes baseline stomatal architecture, while environmental filtering drives hydraulic optimization through safety-efficiency balances. This framework decodes niche partitioning in rocky habitats, informing predictive strategies for karst ecosystem restoration. |
| Key words: Karst seasonal rainforest, stomatal traits, phylogenetic conservatism, environmental filtering, trait trade-offs. |
