亚热带人工幼林树种功能性状与凋落物现存量的关系分析

    Analysis on the Relationship Between the Functional Traits of Tree Species and Litter Standing Crop in the Subtropical Artificial Young Forests

    • 摘要: 凋落物作为森林生态系统的重要部分,是生态系统物质循环的重要环节。以选择亚热带常见28个人工林幼林树种的叶片、茎功能性状与凋落物现存量为研究对象,旨在探讨亚热带人工幼林树种功能性状与凋落物现存量的关系。结果表明:常绿阔叶树种的凋落物现存量最高(均值123.73 g·m-2),其次是落叶阔叶树种(均值 57.08 g·m-2)和常绿针叶树种(均值 54.61 g·m-2)。南方枳椇、红豆树、江南桤木等落叶树种具有高比叶面积、叶氮含量,较低叶片单宁含量、木质密度的特点,说明这些树种在资源利用上表现出获取性的策略。而桂花、石栎、深山含笑、苦槠等常绿树种则具有相反的特点,表现资源保守型的策略。在亚热带人工林幼林中凋落物现存量与叶片氮含量、叶片非结构性碳水化合物为显著的负相关关系。研究结果说明植物功能性状不仅通过影响植物生长速率,还会通过分解速率影响凋落物现存量。因此,在造林树种选择时,需要考虑树种的叶片功能特性。

       

      Abstract: As an important part of the forest ecosystem, the litter is an important link in the material cycle of the ecosystem. In this paper, the functional traits of leaves and stems and the litter standing crop of 28 common tree species in the subtropical artificial young forests were selected as the research objects, in order to explore the relationship between the functional traits of tree species and litter standing crop in the subtropical artificial young forests. The results showed that the evergreen broad-leaved tree species had the highest litter standing crop (mean 123.73 g·m-2), followed by the deciduous broad-leaved tree species (mean 57.08 g·m-2) and the evergreen needle-leaved tree species (mean 54.61 g·m-2). The deciduous tree species such as Hovenia acerba, Ormosia hosiei, and Alnus trabeculosa had the characteristics of high true leaf area, leaf nitrogen concentration, low leaf tannin content and wood density, indicating that these tree species exhibited the acquisitive strategies in resource utilization, while the evergreen tree species such as Osmanthus fragrans, Lithocarpus glaber, Michelia maudiae and Castanopsis sclerophylla had the opposite characteristics, showing the conservative strategy in resource utilization. There was a significant negative correlation between the litter standing crop and leaf nitrogen content and leaf non-structural carbohydrates in the subtropical artificial young forests. The results showed that the functional traits of plants not only affected the plant growth rate, but also affected the litter standing crop through the decomposition rate. Therefore, the leaf functional traits of tree species should be considered in the selection of tree species for afforestation.

       

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