贵州喀斯特森林34个优势种叶片构建成本特征

探讨喀斯特森林优势种叶片构建成本特征可为优势种对喀斯特环境的适应与生存策略、喀斯特退化生态系统植被恢复与重建研究提供理论依据。本研究分析了贵州喀斯特森林34个优势种叶片构建成本(CC),讨论了其与叶片比叶面积、糖类、水溶性酚、脂类、蛋白质、木质素、矿物质和有机酸含量之间的关系。结果表明:1)喀斯特地区植物叶片CC为1.37±0.05g glucose/g DW,显著低于非喀斯特地区(p0.05);2)叶片中有机酸和矿物质含量与叶片CC负相关,可能与植物适应喀斯特地区高碱环境策略有关;3)纸质叶和落叶有机酸和蛋白质含量分别显著高于革质叶和常绿叶,前者CC低于后者,纸质叶和落叶物种更加有利于喀斯特地区植被恢复;4)植物对钙的适应程度越高,叶片CC越低,嗜钙、喜钙植物对喀斯特地区植被恢复具有潜在重要意义。

Leaf Construction Costs of 34 Dominant Species in Karst Forest, Guizhou

Understanding leaf construction costs(CC) of dominant species in Karst forest is the theoretical basis for the research on adaption and survival strategies of species on Karst environment as well as for vegetation restoration, forest reconstruction of the degraded Karst ecosystems. In this study, 34 dominant species in Guizhou Karst forests were sampled for leaf CC analysis. Relationships between CC and leaf mass area, contents of soluble phenols, sugars, lipids, proteins, lignin, mineral and organic acids in the leaves were also detected. Results showed that:1) the mean leaf CC of karst species was 1.37±0.05 g glucose/g DW, significantly lower than those from non-karst forests; 2) the leaf CC was negatively related with the leaf contents of organic acids and minerals, which might be associated with the adaption of those species on the high alkalinity environment; 3) the contents of proteins, organic acids and the CC in paperly and deciduous leaves were significantly higher and lower than those in leathery and evergreen ones, respectively, showing the species with paperly and deciduous leaves are more suitable for the reforestation in Karst regions; 4) the species with a higher adaption capacity on Ca+Mg had lower leaf CC and higher organic acids, indicating the calciphile and preference species are potentially important for the vegetation restoration in Karst areas.