论文部分内容阅读
运用功能性状的研究方法能有效地利用植物的生理、形态和生活史等特征,揭示性状对物种共存的影响。以往有关热带林的群落生态学分析中,基本上都是以胸径(DBH)≥1 cm以上的个体为对象,而对DBH<1 cm的幼苗很少关注。该文以海南岛典型的热带低地雨林老龄林内幼苗多度最大的16个物种的幼苗为研究对象,详细测定了4种功能性状:比叶面积(SLA)、叶干物质比例(LMF)、比茎密度(SSD)和茎干物质比例(SMF),分析了这些性状之间及其与幼苗高度的关系。结果表明:SLA和LMF随幼苗高度增加而显著减小,SSD和SMF随幼苗高度增加而显著增加;幼苗功能性状在不同的生长阶段均达到显著差异;乔木和灌木幼苗的各功能性状均无显著差异,藤本植物幼苗的各功能性状与前两种生长型植物有显著差异;乔木、灌木通过低的SLA、LMF和高的SMF来适应热带低地老龄林的林下低光环境,藤本植物则通过相反的策略实现在老龄林中的共存;幼苗通过调节各功能性状之间的权衡来适应环境。
Utilizing the research methods of functional traits can effectively utilize the characteristics of plant physiology, morphology and life history to reveal the impact of traits on the coexistence of species. In the past, community-based ecological analyzes of tropical forests were generally conducted on individuals with a DBH of 1 cm or more, but seldom focused on seedlings of DBH <1 cm. In this paper, seedlings of 16 species with the highest seedling density in the typical aged tropical forest in Hainan Island were studied. Four functional traits were determined: specific leaf area (SLA), leaf dry matter ratio (LMF) Stem density (SSD) and stem-to-shoot ratio (SMF), the relationship between these traits and their relationship with seedling height was analyzed. The results showed that the SLA and LMF decreased significantly with the increase of seedling height, and the SSD and SMF increased significantly with the increase of seedling height. The functional traits of seedlings reached significant differences at different growth stages. There was no significant difference in the functional traits of both tree and shrub seedlings However, the functional traits of liana seedlings were significantly different from those of the first two kinds of growth plants. Trees and shrubs were adapted to the low light environment of forest under the lowland, low forest by low SLA, LMF and high SMF, Opposite strategies achieve coexistence in aged forests; seedlings adapt to the environment by adjusting the trade-off between functional traits.