Fires Regenerate African Grassland

Are fires more important than rain for the savannah ecosystem?

Natural grass fires are evidently more important for the ecology of savannahs than has previously been assumed. This is the finding of a study carried out in Etosha National Park in the north of Namibia. It is the first study to have investigated the complex interplay of the factors fire, competition, moisture and seed availability in relation to a grass species.

Worldwide the hunting of turtles is at vastly unsustainable levels. For example, in just one market in Dhaka, Bangladesh close to 100,000 wild caught turtles are butchered for consumption during a one-day religious holiday each year.

Furthering the problem is a lucrative international black-market trade in pet turtles and tortoises that has escalated prices of some of the more rare species into the tens of thousands of dollars. Rumors even exist that some of the rarest Asian species are now commanding prices in the hundreds of thousands of dollars.

The findings are particularly significant for the management of semi-arid nature reserves, in which, in the absence of natural plant eaters, fires are the only practical means of renewing the grass canopy.??For the study, the researchers selected an area measuring 500 by 500 metres in Etosha National Park because it has one dominant grass species and because it was possible to rule out interference such as grazing and other human influences.

Etosha National Park in the north of Namibia is the second largest nature reserve in Africa, measuring 20,000 square kilometres. It is about the size of Hesse. The temperatures in the semi-arid savannah fluctuate between 6 degrees centigrade in the winter and 35 degrees in the summer. The area under investigation is one of the driest areas in which plants can still grow, with annual rainfall of just 380 mm. That is less than the rainfall in the rain shadow of the Harz mountains.

Stipagrostis uniplumis is the dominant grass species and lives for several years. The researchers observed the growth of these grasses at weekly intervals for one season and measured the most important climate parameters. They also experimented on small areas by sowing additional seeds, carrying out controlled reconstructions of fires, planting competing grass species and using artificial irrigation.

They found that the dead grass layer significantly hindered the recruitment of young plants. Fire can break up the old grass layer, thereby creating opportunities for regrowth. By contrast, artificial irrigation and the addition of seeds did not result in higher recruitment of seedlings.

Africa Grass Guide

An information guide on the grass species found in Kruger National Park. This grass guide includes facts, images and the latin names of the ...more
Kruger National Park - South African Safari