莫燕华　马姜明　苏静　秦佳双　潘小梅　菅瑞

摘要：  該研究以桂林岩溶石山檵木群落老龄林的25种主要植物为对象，通过测定其叶干质量（DW）、叶干物质含量（LDMC）、叶面积（LA）、叶厚度（LT）、比叶面积（SLA）和叶组织密度（LTD）等叶性状指标，探讨不同物种叶性状的差异以及性状之间的内在联系。结果表明：DW、LDMC、LA、LT、SLA和LTD在乔木层8种植物之间以及灌木层17种植物之间均呈极显著差异（P<0.01）。乔木层植物叶片具有相对较大的DW、LDMC和LT，灌木层植物叶片具有相对较大的SLA，乔木层和灌木层植物叶片LA和LTD的差异不显著。Pearson相关性分析表明，乔木层与灌木层植物叶性状相关性除LTD与LDMC和LA，SLA与LA不一致外，其他性状两两之间相关性均表现为一致性。主成分分析表明，在6个叶性状指标中，DW、LDMC和LTD可以作为反映岩溶石山檵木群落老龄林乔木层植物适应生境的重要叶性状指标，主要表征植物抵御外界干扰及不利环境的能力和对生长环境干湿程度适应的能力，具有“缓慢投资-收益”叶经济谱的特点。SLA和LTD可以作为反映岩溶石山檵木群落老龄林灌木层植物适应生境的重要叶性状指标，主要表征植物获取资源的能力，具有“快速投资-收益”叶经济谱的特点。

关键词： 叶性状， 檵木群落， 老龄林， 桂林岩溶石山

中图分类号：  Q948文献标识码：  A文章编号：  1000-3142（2019）08-1059-10

Abstract：   The leaf traits including leaf dry weight （DW）， leaf dry matter content （LDMC）， leaf area （LA）， leaf thickness （LT）， specific leaf area （SLA） and leaf tissue density （LTD） of the 25 dominant plants in karst hills of Guilin， China， were measured to examine the trait differences among species and their intrinsic relationships， and to discuss the mechanisms of plants adapting to the karst hills at the old-growth forest stage of Loropetalum chinense community. The results showed that the DW， LDMC， LA， LT， SLA and LTD were significantly different among eight species of plants in tree layer and among seventeen species in shrub layer （P <0.01）. The plant species in tree layer had higher DW， LDMC and LT but lower SLA than those in the shrub layer. There was no significant difference in LA and LTD between tree layer and shrub layer species. Pearson correlation analysis showed that the correlations among leaf traits were consistent both in tree layer and in shrub layer except for the relationships of LA with LTD， LDMC and SLA. The principal component analysis shows that among the six leaf traits， DW， LDMC， and LTD might be used as important leaf traits to reflect the adaptations of plants in the tree layer at old-growth forest stage of L. chinense community in karst hills， which mainly represented the ability of plants to resist external disturbances and unfavorable environments and adapt to dry and wet environments. It has the characteristics of “slow investment-income” leaf economic spectrum. SLA and LTD might be used as important leaf traits to reflect the adaptations of plants in the shrub layer at old-growth forest stage of L. chinense community in karst hills， which mainly showed the ability of plants to acquire resources and had the characteristics of “fast investment-income” leaf economic spectrum.

Key words： leaf traits， Loropetalum chinense community， old-growth forest stage， karst hills of Guilin

植物功能性状是指对植物体定植、存活、生长和死亡存在潜在显著影响的一系列植物属性（Díaz et al.， 1999）。这些属性能单独或联合指示生态系统对环境变化的响应，且能对生态系统过程产生强烈……