Welcome to Chinese Journal of Ecology! Today is Share:

cje

Previous Articles     Next Articles

Responses of seed germination of five Asteraceae species to temperature and their invasivity.

CHEN Wen1, WANG Ju-hong2**, CHEN Dan-sheng2, ZHU Hui2   

  1. (1Department of Geography and Tourism Management, Hanshan Normal University, Chaozhou 521041, Guangdong, China; 2Department of Biology, Hanshan Normal University, Chaozhou 521041, Guangdong, China)
  • Online:2015-02-07 Published:2015-02-07

Abstract: Seed germinations of five Asteraceae  species including Bidens pilosa, Mikania micrantha, Wedelia trilobata, Ageratum conyzoides and Eclipta prostrata (a native species) from eastern Guangdong were studied following wetstorage at 15 ℃ for 30 days and then incubation at 25 ℃ or 25/15 ℃ for 30 days, to reveal the response of germination to temperature. The result showed that B. pilosa, E. prostrate, A. conyzoides, M. micrantha and W. trilobata seeds germinated to 100%, 98%, 62%-78%, 44%-52%, 2% (at 25 ℃)-86% (at 25/15 ℃) after seed dispersal, respectively. At the first stage (at 15 ℃ under wet condition), the germination percentages of five Composite plants were 82%-91% (B. pilosa), 19%-26% (W. trilobata), 8.7%-12% (E. prostrata), 0-1% (W. trilobata), 0% (A. conyzoides). At the second stage (at 25 ℃ and 25/15 ℃), seeds of A. conyzoides germinated to 35% and 49%, E. prostrate to 58%-68%, W. trilobata to 4% (at 25 ℃) and 55% (at 25/15 ℃). Quick germination, high germination percentages, and broad temperature adaptation of germination may be important characters of these alien invasive plants.

Key words: plastic film mulching, soil net nitrogen mineralization, resin core culture method, summer maize