Relations aire-especes dans les jacheres du perimetre de la reservenaturelle de Kigwena (Burundi)

摘要

A study aiming the establishment area-species relationship conside-ring the age of the fallow has been led in the perimeter of the natural forest reser-ve of Kigwena (Burundi). According to the systematic inventory of all vegetalspecies present in three classes of fallows (0-2 years, 3-5 years and more than5 years), equations of tendency curves obtained are respectively: y = 4,58 Lnx+19,7, y= 6,70 Lnx +4,99 and y= 7,22 Lnx +11,63. The regression is thereforevery maid with raised coefficients in any case (R2 = 0,97). Values of c and zobtained show that, on an even surface of 1 m2, the highest specific diversity isin recent fallows (c = 18). According to Arrhenius equation, species-area rela-tionship in fallows of our study (0-2 years, 3-5 years and more than 5 years) arerespectively: S = 18,40, 16, S = 8,10, 31 et S = 11,8A10, 26.