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

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 options that might 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 examine performed inside what's frequently a comparatively constrained geographical scope is more and more highlighted. One method of constructing a globally powerful ecology contains kind of formal intercontinental comparative experiences, frequently all in favour of the query of ecological convergence. those reviews are directed at trying out the prediction that related actual and different environmental elements in several components of the area, via their selective impacts, will supply upward thrust to ecosystems which proportion com­ mon structural and useful beneficial properties. may still this be precise, the predictive energy of ecology constructed inside of the sort of framework will be enough to resolve related difficulties somewhere else in such biomes. there's a lengthy historical past 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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Despite this low density, lightning fires are commonly reported and may be very extensive. For example, many fires were almost simultaneously ignited across the western Cape during a lightning storm in December 1988, and eventually burned about 109000ha (Thompson 1990). These lightning fires would almost certainly have included Swartboskloof had the catchment not burnt the previous March. 2 Climate and the Probability of Fire The United States National Fire Danger Rating System (NFDRS) has been successfully adapted and applied in the western Cape (van Wilgen and Burgan 1984).

J. van Hensbergen 40 wood «6mm) (third stratum); (2) a percentage cover value for each stratum; and (3) a packing ratio for each stratum. A stratified fuel modelling approach could allow for the simulation of conditions likely to lead to crown fires in vegetation with marked vertical discontinuities in fuel distribution, such as found in forest patches in Swartboskloof. g. Walker 1981; Kessell et al. 1982, 1984). Such models express the amount of dead, fine litter fuel (X) at time t (in years) as: X t = UK (1 - e- Kt ), where L = K Xmax L is the litter production rate (tonnes ha- 1 yr- 1), Xmax is the maximum litter standing crop at equilibrium, K is the decomposition constant, and e is the base of the natural logarithms.

9), extreme fire danger days (BI > 175) are never experienced in May through July but may occur in any of the months of August to April, although mean frequency only exceeds 2 days per month from November to March. High fire danger days (BI values > 77) occur in all months of the year, but are infrequent in the winter months (May to August). Thus, whilst fires could occur at any time of the year, the greatest likelihood is during the midsummer months of November to March. Large fires in the western Cape are associated with prolonged periods of high fire danger.

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