揭示木质藤本叶片在喀斯特石漠化生境中的适应策略,可为石漠化地区的植被恢复和重建提供基础数据和理论依据。以贵州茂兰喀斯特石漠化生境的8种常见木质藤本为研究对象,采集其叶片样本,并测定形态、解剖特征和元素含量,分析叶片性状的种内和种间变异特征,探究木质藤本在喀斯特石漠化生境下的资源利用策略。结果表明:1)叶片的形态、解剖特征和化学元素性状在种内和种间均存在不同程度的变异,种内变异范围为0.07%~34.56%,种间变异范围为4.30%~70.05%;2)叶片氮含量与磷含量、钾含量显著正相关,磷含量与钾含量显著正相关;3)主成分分析表明,粗叶悬钩子、三叶地锦、多花勾儿茶和灰毛鸡血藤具有较高的比叶面积、氮含量、磷含量和镁含量,主要聚集在第一主成分的负相关一侧,表现出资源获取策略倾向;而金樱子、长叶胡颓子、菝葜和箭羽龙须藤具有较高的叶片组织厚度、钙含量、碳氮比和氮磷比,主要聚集在第一主成分的正相关一侧,表现出资源保守策略倾向。综上所述,喀斯特石漠化生境中,木质藤本叶片在形态、解剖特征和元素含量上表现出显著的种间和种内变异;不同叶片功能性状之间具有显著关联,且具有相似叶片功能性状组合的物种在资源获取策略上具有较高的一致性。

Revealing the adaptation strategies of liana leaf in karst rocky desertification habitats could provide basic data and theoretical basis for vegetation restoration and reconstruction of rocky desertification areas.In this study,leaf samples of 8 common liana species in the Maolan Karst rocky desertification habitat were gathered to evaluate their morphological,anatomical,and elemental composition indices.The characteristics of the intraspecific and interspecific variations in leaf traits of lianas were analyzed,and the resource strategies adopted under the karst rocky desertification habitats were further explored.1)Various degrees of intraspecific and interspecific variations were present in leaf morphological,anatomical,and chemical element traits.The intraspecific variation ranged from 0.07% to 34.56%,whereas interspecific variation spanned from 4.30% to 70.05%.2)Leaf nitrogen content was significantly positively correlated with phosphorus content and potassium content,and phosphorus content was significantly positively correlated with potassium content.3)Principal component analysis showed that species with higher specific leaf area,nitrogen content,phosphorus content,and magnesium content,such as Rubus alceifolius,Parthenocissus semicordata,Berchemia floribunda and Callerya cinerea,were clustered on the negative correlation side of the first principal component,tending to adopt a resource acquisition strategy.While species with higher thickness of various leaf tissues,calcium content,carbon-to-nitrogen ratio,and nitrogen-to-phosphorus ratio,such as Rosa laevigata,Elaeagnus bockii,Smilax china and Bauhinia curtisii,were clustered on the positive correlation side of the first principal component,suggesting a resource conservation strategy.Overall,the study highlighted significant intraspecific and interspecific variability in leaf morphological,anatomical,and chemical traits within the karst rocky desertification context.Notable correlations among different traits were identified,with species exhibiting similar leaf trait syndromes adopting analogous resource strategies.