| Biology and Soil |
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| Seed Germination Strategies of 32 Chenopodiaceae Species on the Southern Gurbantunggut Desert |
| LIU Hui-liang1,2, SONG Ming-fang1,2, DUAN Shi-min1, WANG Xi-yong1, ZHANG Dao-yuan1, YIN Lin-ke1 |
1.Key Laboratory of Biogeography and Bioresource in arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract In order to determine seed germination strategies and ecological significance of Chenopodiaceae species, seed germination characteristics (germination percentages, germination beginning days, germination periods and mean germination time (MGT) of 32 Chenopodiaceae species from the south edge of Gurbantunggut Desert were studied. Seeds of each species were incubated with alternating temperature regime of 25 ℃ in light for 12 h and 10 ℃ in dark for 12 h, simulating natural conditions during the spring germination period. Seed germination was monitored every 24 h for 60 days. Results showed that germination percentages of 32 species displayed a bimodal distribution, and the species with germination percentage exceeding 80% (25%) and less than 20% (31.3%) were most; germination beginning days displayed a skewness toward short periods, and 28 species began to germinate within 1~3 d (87.5%); MGT was also skewed toward short periods, and 21 species showed MGT less than 5 d (65.6%), and Chenopodium hybridum had maximal MGT (23.7 d); germination period was different among 32 species, and 15 species was less than 15 d, 10 species was in 15~30 d, and 5 species exceeded 30 d. Principal component analysis and clustering analysis showed that the 32 Chenopodiaceae species can be divided into four main germination patterns: rapid germination, transitional germination, slow germination and low germination. The results showed that 32 Chenopodiaceae species had different germination strategies, for example, the "opportunism" germination strategy of rapid germination species, the "caution" germination strategy of transition germination species and slow germination species, and the "bet hedging" germination strategy of low germination species, which were associated with soil salinization. Moreover, seed mass and its variation were small in logarithm scale (10-2~101), which implied that Chenopodiaceae species could hold a transient or long-living seed bank.
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Received: 02 June 2011
Published: 20 March 2012
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2012, Vol. 32 
