云南哀牢山和玉龙雪山森林树种幼苗对海拔梯度的响应及其季节性差异  

Response of tree seedlings to altitudinal gradient and its seasonal variation in Ailao Mountain and Yulong Mountain,Yunnan Province,China

作　　者：李洁琼[1,2] 宋晓阳[1,2] 曹敏[1] LI Jie-qiong SONG Xiao-yang CAO Min(Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chi- nese Academy of Sciences, Mengla 666303, Yunnan, China University of Chinese Academy of Sci- ences, Beijing 100049, China)

机构地区：[1]中国科学院西双版纳热带植物园热带森林生态学重点实验室,云南勐腊666303 [2]中国科学院研究生院,北京100049

出　　处：《应用生态学报》2016年第11期3403-3412,共10页Chinese Journal of Applied Ecology

基　　金：国家重大科学研究计划项目(2014CB954100);云南省应用基础研究计划项目(2014GA003);中国科学院对外合作重点项目(GJHZ201317)资助~~

摘　　要：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.Tree seedlings under forests serve as an important part of forest ecosystem and play a role in the natural regeneration of forests. To understand the altitudinal distribution patterns of tree seed- lings and the response to seasonal variation, we investigated the species composition and individual numbers of tree seedlings, and their seasonal dynamics in Ailao Mountain （ subtropical region） and Yulong Mountain （subalpine region） in Yunnan Province. The results showed that the species rich- ness of tree seedlings increased with altitude, peaked in the middle of the mountains, and followed a decline at higher altitudes, and the dominant species also changed significantly. Species richness of tree seedlings was significantly higher at the end of rainy season than that at the end of dry sea- son, and the dominant species had obvious seasonal difference.

关 键 词：树种幼苗 海拔梯度 季节差异 

分 类 号：S718.5[农业科学—林学]