Journal
JOURNAL OF TROPICAL ECOLOGY
Volume 26, Issue -, Pages 313-322Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0266467409990629
Keywords
canopy cover; fire regime; grass dynamics; litter; microsites; northern Australia
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Funding
- Bushfire Cooperative Research Centre, Melbourne, Australia
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Environmental factors influencing grass establishment and performance in tropical savannas are poorly understood, particularly in relation to disturbance. We describe a seed sowing experiment that examined the effects of fire regime. canopy cover and litter cover on the emergence, establishment, height and fecundity (seed production) of the regionally dominant annual grass Sorghum intrans in northern Australia. Establishment was significantly lower under the woody canopy compared with canopy gaps, and where seeds were sown on a layer of litter compared with bare soil. However, variation in fire regime had no significant effect on establishment or seed production. Additionally, a shade-house experiment was conducted to test the effects of litter on seedling emergence of'S. intrans and six other grass species representative of the local flora (Pseudopogonatherum contortion. Sorghum plumosum, Chrysopogon latifolius, Eriachne triseta, Heteropogon triticeus and Alloteropsis semialata). All species showed reduced emergence when sown either above or below litter, compared with bare soil. Our results demonstrate the importance of the overstorey as a determinant of S. intrans abundance and savanna grass composition more generally, through its effect on establishment. The aversion of savanna grasses to litter (and S. intrans to canopy shading) supports the notion of savanna species being highly adapted to disturbance.
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