Fire in South African Mountain Fynbos: Ecosystem, Community by B. W. van Wilgen, D. J. McDonald (auth.), Dr. Brian W. van

By B. W. van Wilgen, D. J. McDonald (auth.), Dr. Brian W. van Wilgen, Dr. David M. Richardson, Dr. Frederick J. Kruger, Dr. Hubertus J. van Hensbergen (eds.)

Ecologists are more and more being drawn into the duty of addressing difficulties of environmental degradation. they're anticipated to discover strategies that may result in sustainable source use through the international. In doing so, the robustness of the technology turns into more and more vital, and the matter of extrapolating the result of learn performed inside what's frequently a comparatively restricted geographical scope is more and more highlighted. One method of constructing a globally powerful ecology consists of roughly formal intercontinental comparative reviews, frequently occupied with the query of ecological convergence. those reports are directed at trying out the prediction that related actual and different environmental elements in numerous components of the area, via their selective affects, will supply upward thrust to ecosystems which percentage com­ mon structural and useful positive factors. may still this be actual, the predictive energy of ecology constructed inside any such framework might be enough to unravel comparable difficulties in different places in such biomes. there's a lengthy heritage of such an method in mediterranean­ variety ecosystems, documented in a sequence of volumes and their accompanying medical papers starting with that of Di Castri and Mooney (1973).

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Additional resources for Fire in South African Mountain Fynbos: Ecosystem, Community and Species Response at Swartboskloof

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_ il '! I. I: ~,' I ..... # -.. ••• j. ~. fJ;'~ . J>• :~ ~ l' Fig. 16. Map of Swartboskloof showing the advance of the fire front at 3-h intervals on 17 March 1987. The central portion (within the 24:00 line) was burnt on 18 March 1987. Stars (*) indicate positions where the fire was ignited using flares both wind and slope, to ensure control. Once the catchment had been "closed off" the upper reaches were ignited with flares but the burn was nevertheless slow and the central portion of the catchment had still not burnt when a combination of wind, topography, and increasing humidity saw the fire die out after 24:00.

1991) indicate that fire frequencies of between 11 and 15 years are the norm for fynbos. W. J. van Hensbergen Swartboskloof has been subjected to an average fire frequency of around 16 years (Fig. 2), with a range of fire frequencies from 7 to 29 years. Minimum fire frequencies in fynbos are therefore obviously not determined by fuel buildup alone. The question of why fynbos does not burn more frequently would probably be explained by a scarcity of ignition sources. Natural fires in fynbos are caused by lightning, and sparks from falling rocks (Edwards 1984).

The vapour pressure deficit (vpd) was calculated from the minimum relative humidity and maximum temperature values for each day, on the assumption that these values would be approximately coincident in time. 2). Temperatures in the catchment may be expected to decrease with altitude. G. ' data). 8°e can be expected across the Swartboskloof catchment. 1. 2. 6 likely in pockets at higher altitudes and occasional snowfalls occur in wmter above 600m. B. Versfeld et at. Fig. 4. Spatial variation of net solar radiation (MJm- 2 yCk l x 103) in Swartboskloof.

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