TITLE:
Land Cover Dynamics in the Kirisia Forest Ecosystem, Samburu County, Kenya
AUTHORS:
Fiesta Warinwa, Francis Mwaura, John Warui Kiringe, Antony Oduya Ndubi
KEYWORDS:
Kirisia Watershed Ecosystem, Forest Cover, Water Supply
JOURNAL NAME:
Advances in Remote Sensing,
Vol.5 No.3,
August
5,
2016
ABSTRACT: The study characterized the status and trend of land cover transformation in Kirisia forest ecosystem
between 1973 and 2015 using remote sensing and GIS. The dominant land cover types
consisted of indigenous forest followed by shrub land and bush land. The findings showed a major
increase in the built environment by 55.4% and an overall reduction in forest cover by 21.3%. Up
to 83.9 km2 of the original indigenous forest was lost between 1973 and 1986 due to severe fires.
Thereafter, 23.7 km2 of the remaining indigenous forest was lost between 1986 and 2000 mainly
through charcoal burning, illegal timber logging and livestock forage harvesting. A slight recovery
occurred between 2000 and 2015 with a 5% increase in indigenous forest cover mostly through
natural succession by shrub land and bush land in the burnt forest areas especially following the
1998 El Nino period. The land cover change in the forest ecosystem was not exceptional in Kenya
but mirrors similar changes that have been documented in other valued dry land watershed ecosystems
in the country including the national water towers. The continued loss of forest cover is
likely to affect the water recharge capacity in the watershed thereby creating severe water scarcity
for the people in Mararal town as well as nearly 142,954 other individuals in the Kirisia region.
Appropriate interventions are therefore needed to mitigate the negative land cover change in Kirisia
forest and restore its hydrological functions and water recharge capacity.