中梁山石灰岩山地30种主要植物叶片性状研究

为探讨生长在喀斯特石灰岩山地植物叶片性状适应特征,在重庆中梁山海石公园选取乔、灌、草三种生活型植物共30种,分别测定其叶干质量(mLDMC)、比叶面积(SLA)、叶pH、叶碳质量(mLCC)、叶氮质量(mLNC)和叶碳氮比等六个叶片性状因子.结果表明:不同叶片性状因子变异系数不同,其中,植物mLDMC、SLA和mLNC变异较大,分别为28.7%,50.8%和21.4%;mLDMC和SLA在不同生活型植物中存在显著差异,与乔木和灌木相比,草本具有较低的mLDMC和较大的SLA,而乔木和灌木在两者之间差异不显著;所有叶片性状因子中,植物mLDMC和SLA呈显著负相关,其他因子间没有显著相关性.可见,mLDMC和SLA是植物资源利用分类轴上划分植物类群的最佳指标,石灰岩地区不同生活型植物叶片性状不同,这是植物和环境相互选择综合作用的结果.

Leaf Traits of Main Plants on Limestone Area in Zhongliang Mountain

To explore the adaptive feature of plant leaf traits in Karst limestone area ,30 species of three life forms ,namely ,trees ,shrubs and herbs from Zhongling mountain in Chongqing city of Southwest China have been selected and their leaf dry matter content (mLDMC ) ,specific leaf area(SLA) ,leaf pH ,leaf carbon concentration(mLCC ) ,leaf nitrogen concentration (mLNC ) and leaf carbon nitrogen ratio (C/N) measured . The results show that the coefficient of variation differed between different leaf traits and a large variation has been observed in mLDMC and SLA being 28 .7% ,0 .8% ,1 .4% ,respectively .mLDMC and SLA differed significantly among three life forms .Compared with trees and shrubs ,herbs have lower mLDMC and higher SLA ,but no significant difference is observed between trees and shrubs .mLDMC and SLA are significantly negatively correlated of all leaf traits .However ,there is no significant correlation among other leaf traits . It is concluded that mLDMC and SL A could be used to predict the plant species position along resource use gradient .Leaf traits differ in three life forms ,it is the result of the selection between plants and environ-ment mutually .