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Germination Studies on some Annual Species from an Arid Region of Western Australia

J. J. Mott
Journal of Ecology
Vol. 60, No. 2 (Jul., 1972), pp. 293-304
DOI: 10.2307/2258347
Stable URL: http://www.jstor.org/stable/2258347
Page Count: 12
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Germination Studies on some Annual Species from an Arid Region of Western Australia
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Abstract

Assessments of numbers of annual plants in the arid Murchison Region showed a marked seasonal variation in floral composition. Summer rain produced a predominance of grasses, while winter rains resulted mainly in the growth of dicotyledons. Incubation of topsoil under warm conditions yielded flora of a summer type, while cooler conditions resulted in germination of typical winter vegetation. Determination of the germination characteristics of three species, Aristida contorta, Helipterum craspedioides and Helichrysum cassinianum, indicates that the control of seasonal germination may be at first due to dormancy of the young seed of each species, and subsequently to temperature requirements. Germination of these species may be controlled by the necessity of the surface seed to remain moist for some time before germinating so that a heavy rain is required for germination and establishment.

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