Yousif et al
Greener Journal of Geology and Earth Sciences Vol. 1 (3), pp. 073-077, November 2013.
ISSN: 2354-2268 © 2013 Greener Journals
Manuscript Number: 062413687
Assessing Grazing Impact on Arid and Semi Arid Rangelands in Kordofan Region
Yousif Mohamed Zainelabdeen Hamed*1,
Abdelrahman Ahmed Khatir2
1Gedarif Research Station.
2El Obied Research Station.
*Corresponding Author’s Email: yousifmohamed80 @ yahoo.com
This study was conducted in Um "Nabag" (15km north of "Bara"), "Dilling" (160km south of "Elobeid") and "Eldemokya" (30km east of "Elobeid").
The objective was to assess the effect of grazing level on vegetation cover and frequency, and to assess its effect on biomass production and shoot/root ratio.
The results showed different levels of grazing intensity at different sites as indicated by cover and shoot/ root ratio. More intensive grazing levels were found at Bara in the north, early and late in the rainy season but in Dilling it was not found in the late in the rainy season for both seasons (2008 and 2009) which indicated longer stay of herders in "Bara" area as a rainy season residence.
The results also showed that, there was a decrease in cover percentage increase in bare soil with increased grazing intensity since it reached 70% and 67% for "Bara" and "Demokeya" at level II(>50%<75% grazed) grazing, indicating high possibility of erosion hazard and reflecting the impact of using rainy season residence intensively, subjecting the area to soil erosion hazards.
There was drastic decrease in root/shoot ratio with increasing grazing intensity decreasing from 1:6 to 1:10 in (2008) from non grazed to level (I) (>50% grazed) grazing, and from 1:3 to 1:4 in (2009) from non grazed to level (I) grazing for "Bara" between early and late time of use.
Keywords: Intensity of grazing level, vegetation cover, Shoot/Root ratio, litter, bare soil.