Spread of the introduced tree species Prosopis juliflora (Sw.) DC in the Lake Baringo area, Kenya :

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The spread of the introduced plant Prosopis juliflora (Sw.) DC was studied in the Lake Baringo area in Kenya. In addition, woody plant diversity and soil characters were studied. Major initial planting sites with P. juliflora were located and marked with GPS. The number of major plantations was 16 and obvious signs of spread were found from 9 of the plantations. Sites planted with P. chilensis were found as well, but no signs of spread were observed. Small scale plantations with P. juliflora and P. chilensis were also located. Observations of spread by P. juliflora were made both from major planting sites and from small scale plantations. P. juliflora showed the strongest signs of spread along roads and in areas where the soil had a fine texture and where there was seasonally or permanently good access to water. The abundance of plant species was low in the area and 31 species were scored during the inventories. However, the sampling was not large enough to capture the whole species pool. Plant diversity was slightly higher where P. juliflora was absent. Soil samples showed a high pH and the highest was detected in Loruk in the northern part of the study area. Loruk also had the highest amount of exchangeable potassium and the coarsest soil. The invasion of P. juliflora seemed higher in areas where no previous vegetation exis...