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Jomo Kenyatta University of Agriculture and Technology (2007)

Assessing the spread of prosopis juliflora in Marigat Division using geographical information system and satellite remote sensing

Muuo, Moses Kagiri

Titre : Assessing the spread of prosopis juliflora in Marigat Division using geographical information system and satellite remote sensing

Auteur : Muuo, Moses Kagiri

Université de soutenance : Jomo Kenyatta University of Agriculture and Technology, Kenya

Grade : Master of Science (MS) 2007

Résumé
Prosopis juliflora has been spreading rapidly colonizing pasturelands, farms and forming dense impenetrable thickets in Marigat division. In this study, Thematic Mapper (TM) images for 1986 and 1989 and Enhanced Thematic Mapper plus (ETM +) images for 2000 and 2003 were used as source of remotely sensed data for mapping the spread of Prosopis juliflora and perform land cover change in the division. Structured questionnaires were used to evaluate people’s perceptions on the effects of Prosopis juliflora. Supervised classification approach was used to obtain classified images for 1986, 1989,2000 and 2003. The images depicted land covers such as shrub land, grass cover, Prosopis juliflora, wetlands, agricultural fields and bare land. On accuracy assessments, Kappa stastic yielded 0.6, 0.6, 0.7 and 0.7 for images of 1986, 1989,2000 and 2003 respectively while overall accuracy yielded 65%, 63%, 75% and 79% for the same images. Statistical analysis showed that between 1986 to 2003, spatial areas covered by Prosopis juliflora, wetlands, agricultural fields and bare land increased by 101 %, 50%, 4.5% and 86% respectively while areas covered by grass cover and shrub land declined by 86%, and 12% respectively. Results from questionnaires indicate livestock production has been adversely affected by the invading Prosopis juliflora. The critical grass and forage species have been eliminated and hence affecting pastoralism, which is the main lifestyle and source of livelihood for local people in Marigat division. On animal health, the respondents stated when their animals feed on Prosopis juliflora pods, they develop teeth complications. The fresh and sugary pods are sticky and hence collect around the base of the teeth leading to massive teeth decays, wearing and loosening. The animal cannot chew regurgitated bolus because of weak teeth, most of them falling off and hence eventually dies as a result of starvation. Similarly, areas under farming activities have been reduced by the invading Prosopis juliflora and hence affecting food production in Marigat division. Therefore, if unchecked, Prosopis juliflora has the potential to wipe out pastoralism and farming activities in the near future. However, some of the respondents cited benefits accrued from its product such as building posts, fuel wood and pods (animal feed). Many of the households rely on charcoal and poles from Prosopis juliflora for sale and domestic uses. The pods of Prosopis juliflora are popular source of fodder for livestock during dry seasons. The vigorous and continous flowering of the species has made bee keeping a popular economic activity in the division. Therefore, the study recommends enhanced use of products from Prosopis juliflora through their proper processing and marketing. Periodical monitoring of the spread of Prosopis julifora by using GIS, SRS and GPS is also highly recommended. Further studies on impact of Prosopis juliflora on soil physical and chemical properties should be carried out to compliment this study. Finally, these research findings could be used in the management and control of Prosopis juliflora not only in Marigat division but also in other arid and semi - arid areas affected by the spread.

Mots Clés : Trees / Prosopis juliflora / Geographic information systems / Remote sensing / Marigat Division, Kenya

Présentation (Research Kenya)

Page publiée le 22 septembre 2010, mise à jour le 24 février 2018