Written Paper

Grazing systems effects on inflitration rates and sediment production of a bushed grandland Buchuma, Kenya  [1985]

Mbakaya, D. S.(Kenya Agricultural Research Institute, Nairobi (Kenya). National Agricultural Research Laboratories) Kenya Agricultural Research Institute, Nairobi (Kenya). National Agricultural Research Laboratories [Corporate Author]

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A drip-type rainfall simulator was used to assess effects of grazing systems and vegetation on infiltration rates and sediment production at Buchuma Range Research Station, Kenya. Four livestock grazing treatment were studied: high intensity low frequency, rotation, moderate continous and non-grazing. A combination to cattle and goats were utilized in each treatment. Two vegetation types and bare groung were aslo studied. Chloris roxbughiana Grewia bicolor and bare groung (unvegetated.)The study objectives were to determine (1)the influences of high intensity low frequency (HILF), rotation grazing (RG), moderate continous grazing (MCG) and live-stock exclosure (EXC)on infliltration rates and sediment production, (2)the inflience of HILF and RG on vegatation, (3)the influence of Grewia bicolor, Chloris roxburghiana and bare ground on infiltration rates and sediment production, (4)interrelationships of plant standing crop and cover, soil bulk density, organic mater, soil moisture content, texture, aggregate stability and micro-relief with infiltration rates and sediment. Infiltration rates were consistently greater in vegetated plots than unvegetated plots. Howeverr, in the vegetated plots there was signicant difference between the two vegatation types. Infiltration rates were greater under Grewia bicolor than in chloris roxburghiana. Sediment production production was greater was greater from unvegetated plots than from vegetated plots. The EXC had the grea
ter infiltration rate, although it was not signficantly diffefferent from high intensity low frequency before grazing (HILF1), rotation grazing before grazing (RGI) and rotation grazing after grazing (ZG2). The MCG pasture infiltration rates were less than other pastures although they were not significantly different from RG pastures. During August the greatest sedimentproduction occurred from MCG pastures although it was not sognificantly greater than RG pastures. During Dcember greater sediment production was from RM2 pastures although it was only significantly greater than the Exc. stepwise multiple regression identified variables associated with vegatation foliar cover, littel cover, standing crop and litter accumulation and soil aggregate stability as being the most important in influencing influencing infiltration rates and sediment production.