Germination characteristics of Artemisia ordosica (Asteraceae) in relation to ecological restoration in northern China
Rimmington, Glyn M.
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Zheng, Y., Rimmington, G.M., Gao, Y., Jiang, L., Xing, X., An, P., El-Sidding, K., and Shimizu, H., 2011, Germination characteristics of Artemisia ordosica (Asteraceae) in relation to ecological restoration in northern China: Canadian Journal of Botany v. 83, no. 8, p. 1021-1028, doi: 10.1139/b05-059.
Artemisia ordosica Krasch. (Asteraceae) is the dominant psammophytic shrub species on the Ordos Plateau of northern China and is used for revegetation of semi-arid areas. Experiments were conducted to determine the effects of light intensity, constant temperature, alternating temperatures, and water potential on germination to determine why air-dispersed achenes fail to germinate well in the field. Achenes germinated within a wide alternating temperature window, except under the 5:15 °C (night:day) temperature regime in darkness. Final percent germination (FPG) was higher in darkness than in light at alternating temperature regimes, except under the 20:30 °C (night:day) temperature regime. Achenes subjected to a range of constant temperatures in the dark had high FPG over 76.8% except at 30 °C (8%). Photosynthetic photon flux densities (PPFD) of 100 and 400 µmol·m 2·s 1 significantly lowered FPG under a 10:20 °C (night:day) regime, while at 0 25 µmol·m 2·s 1 PPFD, the FPG was over 92%. Few achenes germinated at 1.4 MPa. The most suitable temperature for germination of achenes placed under water stress was 20 °C. The best timing for air dispersal is mid-May, so seeds would become covered with sand at a time when temperature and soil moisture conditions were optimal for germination.Key words: air dispersal, Artemisia ordosica, hydrothermal time, psammophytes, semi-arid regions, temperature.
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