Journal of East China Normal University(Natural Sc ›› 2015, Vol. 2015 ›› Issue (2): 122-132.doi: 10.3969/j.issn.1000-5641.2015.02.015

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Character of seed rain of species with different dispersal modes in Tiantong evergreen broad leaved forest, Zhejiang Province

LEI Xiao 1,2, YANG Qing-song1,2,LIU He-ming1,2,XING Jiu-zhou1,2,WANG Xi-hua1,2   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai200241, China;
    2. Tiantong National Station of Forest Ecosystem, Chinese National Ecosystem Observation and Research Station, East China Normal University, Shanghai 200241,China
  • Received:2014-04-09 Online:2015-03-25 Published:2015-05-28

Abstract: To reveal the character of seed rain of species with different dispersal modes, we explored the seed rain in a 20 hm2 evergreen broadleaved forest dynamic plot in Tiantong from Oct.2012 to Sept.2013, then analyzed the density and species composition of seed rain and seed limitation (measured by the proportion of plots that seeds were not dispersed in). The results were showed as follows: (1) A total of 13,638 seeds were collected belonging to 66 species and 28 families.The density of seed rain was 146 seeds/m2during the twelvemonth period (total trap area = 93.5 m2); (2) 56% of tree species were not found in seed traps which contributed to generally low species similarity between seeds and adult plants. Different dispersal modes also affected the Jaccard similarity coefficient (R). The extreme R coefficient(Rmax) while the maximum distance from the seed collector (d) were caused by wind(Anemochory:Rmax=0.226,d=20 m;Gravity:Rmax=0.077,d=9 m;Zoochory:Rmax=0.094,d=13 m), which indicated that the seeds 〖JP2〗dispersed by wind had an advantage in longdistance dispersal;(3)More than 60% of species were distributed among no more than ten seed traps during a year, which exhibited seed limitation in plot. As far as the relatively dominant species(IV≥1) were concerned, dispersal mode could have a great impact on seed limitation. When it comes to anemochory species, it was possible that their seed limitation was just the result of lacking in individuals, and a severe seed limitation in gravity and zoochory species could be attributed to low productivity and incapacity in dispersal.

Key words: seed rain, dispersal mode, seed limitation, Tiantong, evergreen broad leaved forest

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