Seedling dynamics differ between canopy species and understory species in a tropical seasonal rainforest,SW China  

作　　者：Libing Pan Xiaoyang Song Wenfu Zhang Jie Yang Min Cao 

机构地区：[1]CAS Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Menglun,Mengla 666303,Yunnan,China [2]College of Life Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Plant Diversity》2024年第5期671-677,共7页植物多样性（英文版）

基　　金：supported by the NSFC China-US Dimensions of Biodiversity Grant (DEB: 32061123003);National Natural Science Foundation of China (31870410, 32171507);the Chinese Academy of Sciences Youth Innovation Promotion Association (Y202080);the Distinguished Youth Scholar of Yunnan (202001AV070016);the West Light Foundation of the Chinese Academy of Sciences;the Ten Thousand Talent Plans for Young Top-notch Talents of Yunnan (YNWR-QNBJ-2018-309)

摘　　要：We used 11 years of census data from 450 seedling quadrats established in a 20-ha forest dynamics plot to study seedling dynamics in tree species of a tropical seasonal rainforest in Xishuangbanna,southwestern China.We found that overall seedling recruitment rate and relative growth rate were higher in the rainy season than in the dry season.Both the recruitment rate of seedlings from canopy tree species(two species)and the relative growth rate of seedlings from understory species(nine species)were higher in the rainy season than in the dry season.However,in the rainy season,the recruitment rate of seedlings was higher for canopy tree species than for understory tree species.In addition,relative growth rate of seedlings was higher in the canopy species than in understory seedlings in the dry season.We also observed that,in both rainy and dry seasons,mortality rate of seedlings was higher for canopy species than for understory species.Overall,canopy tree species appear to have evolved a flexible strategy to adapt to the seasonal changes of a monsoon climate.In contrast,understory tree species seem to have adopted a conservative strategy.Specifically,these species mainly release seedlings in the rainy season and maintain relatively stable populations with a lower mortality rate and recruitment rate in both dry and rainy seasons.Our study suggests that canopy and understory seedling populations growing in forest understory may respond to future climate change scenarios with distinct regeneration strategies.

关 键 词：Tropical forest Tree seedling SEASONALITY RECRUITMENT Mortality Relative growth rate 

分 类 号：S718.5[农业科学—林学]