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Articles by B.J. Dlamini
Total Records ( 2 ) for B.J. Dlamini
  Solomon Tefera , B.J. Dlamini and A.M. Dlamini
  A study was conducted to investigate pattern of Chromolaena odorata invasion and its effect on grass layer in three land use systems (communal, government ranch and game reserve) and two soil classes (lithosol and raw mineral soil). Six sites (2 ha each) were selected, one on each of the two common soil classes for each land use system. The communal land had significantly lowest (p<0.05) density (465 SE ha-1) of C. odorata compared to the game reserve and there was no significant difference in total density in the two soil classes (mean = 691 SE ha-1). The greatest proportion occurred in height class of >1-1.5 m and the lowest in >0-0.5 m. Shrub (>0.5-3 m) and seedling (>0-0.5 m) densities were significantly (p<0.05) highest in the game reserve and commercial ranch, respectively. Total dry matter (DM) grass production within and outside invaded areas showed significant differences (p<0.05) in many sites. More pronounced trends of DM production were observed for the most dominant palatable species which included Urochloa mozambicensis, Panicum deustum and P. maximum. It is concluded that the invasion of C. odorata was rated to be moderate or high while past land management may be the major factor in the difference between land use systems. The effect of invasion of C. odorata on the grass layer was also severe to constitute a threat to livestock and game industries. Adaptive control strategies are therefore recommended while further work will be required to identify the causes of difference between land uses, to determine soil characteristics and overall productivity potential as affected by C. odorata invasion as well as interaction effects between biotic and abiotic factors.
  Solomon Tefera , B.J. Dlamini and A.M. Dlamini
  A study was conducted to assess woody vegetation pattern in the semi-arid savannas of Swaziland under three land use systems (communal land, government ranch, game reserve) and three soil classes (vertisol, lithosol and raw mineral). Communal perceptions towards the indigenous use of woody plants were also assessed. A total of 90 woody plant species were identified. Fifty eight percent of the identified woody plants have browse value to livestock. The mean density of total woody plants combined ranged between 1352 TE ha-1 and 11 533 TE ha-1. In severely encroached area, the total woody plant density was greater (p< 0.001) on communal land (8578 TE ha-1) than in the ranch (5608 TE ha-1) and game reserve (4123 TE ha-1) and on raw mineral soil than lithosol. In less encroached areas, land use had no significant differences, but lithosol (2024 TE ha-1) had greater density (p< 0.05) than vertisol (1237 TE ha-1). The most important encroaching species in the study areas were: A. tortilis, A. nilotica, C. odorata, A. burkei, C. apiculatum, S. caffra and D. cinerea. All the sites in the current study were dominated by height class of >0.05 -2 m, which suggested the potential for long-term increase. There is an indication that bush encroachment showed non to significant variations at small scale (between land uses, soil classes) and large scale levels of resolution (between study areas). At small scale level, significant variations may be due to past and present grazing pressure as well as inherent diversity and nature of the soil. This study suggests in severely encroached area in particular that generalized statements about the relatively bad condition of any land use system and the permanence of any specific condition must be treated with caution.
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