Land cover and land use change analysis: Its impacts on rangeland ecosystems in Kakooge County, Nakasongola district, Uganda

James Mbaziira
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引用次数: 2

Abstract

The paper presents and reviews the land cover and land use changes within a rangeland ecosystem and their impacts for a period of 18 years (1987–2005) in Nakasongola district, specifically, Kakooge County. The study used ArcGIS 10.2 data, field observations and community perceptions. Results showed a typical change in built areas, bush lands and subsistence farmlands expanded by 822.2% in 1987 and 61.7% in 2015, while commercial farmland, forest plantations, wetlands and woodland declined by 1.5%, 67.5%, 37.6% and 6.5% respectively. The changes in land cover and land uses originated from poverty, charcoal production, occurrence of drought, and introduction of pine plantations by 41%, 37%, 55% and 50%. Similarly, this resulted into frequent droughts, reduced soil productivity, food insecurity, and wood fuel crisis by 98%, 67%, 33%, and 36%, respectively. There was also general decline of land holding per household from 1.6ha to 1.5ha. Thus, such cumulative effectscontribute to rangeland degradation calling for appropriate management measures like strengthening environmental monitoring and ecosystem conservation strategies, extending poverty alleviation programmes and integrating of tree planting into the farming system in a more collaborative way to halt  the outpacing impacts.
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土地覆盖和土地利用变化分析:对乌干达Nakasongola地区Kakooge县牧场生态系统的影响
本文介绍和回顾了Nakasongola地区,特别是Kakooge县18年来(1987-2005年)草地生态系统的土地覆盖和土地利用变化及其影响。该研究使用了ArcGIS 10.2数据、实地观察和社区感知。结果表明:典型变化类型为建成区、灌丛地和自耕农地,1987年和2015年分别增长822.2%和61.7%,商品耕地、人工林、湿地和林地分别减少1.5%、67.5%、37.6%和6.5%。土地覆被和土地利用的变化分别为41%、37%、55%和50%,原因分别为贫困、木炭生产、干旱的发生和松林的引入。同样,这导致干旱频发、土壤生产力下降、粮食不安全和木材燃料危机分别增加了98%、67%、33%和36%。每户土地拥有量也从1.6公顷下降到1.5公顷。因此,这种累积效应有助于牧场退化,因此需要采取适当的管理措施,如加强环境监测和生态系统保护战略,扩大扶贫方案,并以更合作的方式将植树纳入农业系统,以制止这种过快的影响。
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