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林下树种幼苗是森林生态系统的一个重要组成部分,在森林的自然更新过程中发挥着重要作用.为了解树种幼苗的海拔分布格局以及森林群落林下幼苗对季节性气候的响应,本研究调查了云南省哀牢山(亚热带)和玉龙雪山(亚高山)两个地区的林下树种幼苗物种组成及个体数量的海拔分布格局及其季节动态.结果表明:随着海拔的升高,两个山体的树种幼苗物种丰富度均先增加后下降,优势种也呈现明显的变化;雨季末期的幼苗物种丰富度明显大于旱季末期,其中,占据优势地位的物种具有较明显的季节性差异;不同海拔带树种幼苗优势种也具有显著差异.
Undergrowth seedlings are an important part of forest ecosystem and play an important role in the natural regeneration of forests.In order to understand the distribution pattern of tree seedlings and the responses of forest seedlings to seasonal climate, The distribution patterns and seasonal dynamics of species composition and individual numbers of understory seedlings of Ailao Mountain (subtropical zone) and Jialong Snow Mountain (subalpine) in Yunnan Province were studied. The results showed that with the elevation increasing, Species richness of tree seedlings increased first and then decreased, and dominant species also showed obvious changes. Species richness of seedlings in late rainy season was obviously greater than that in late dry season, in which the predominant species had obvious seasonal differences; Belt species seedlings also have significant differences in dominant species.