The population dynamics of some woody species in the kalahari sand vegetation of Hwange national park

Abstract

The nopulaHon dynamics and principal controlling factors of six woody species found in the Kalahari Sand vegetation of Hwange Nation?1 Park are Investigated. The populations fror- woodland and sc areas of known human disturbance (logging) are compared with undisturbed sites. The effects of edaphic factors, frost-, fire and elephant damage on the woody species are examined. The results show the populations from the disturbed are?s vo be generally unstable with a decline in the woodlands. The estimated rerr litment of pluri lug a is 0,2 ?f the rate p.eedel to woodlands In the presen state* T1 influence of soil mo,svure is of major importance in determining vegetation 'hysiognomy an^ species composition. Frost and fire =*lso have a strong modifying influence on the vegetation through the differing sensitivities of each species. Frost, fire and elephant account for 57'''., and 19* of the damage (excluding unknown factors). In conclusion a hypo*-hes s showing *-he interaction of abiotic and bioMc factors on the three stages of vegetation cycling : woodland, scrub and grassland, Is presented.