作者
Wolde Mekuria, E Veldkamp, Mitiku Haile, Jan Nyssen, Bart Muys, Kindeya Gebrehiwot
发表日期
2007/4/1
期刊
Journal of arid environments
卷号
69
期号
2
页码范围
270-284
出版商
Academic Press
简介
As a response to land degradation in Tigray, Northern Ethiopia, regional authorities have promoted rehabilitation of degraded lands through closed areas since 1991. It is generally assumed that exclosures lead to restoration of natural resources such as soil fertility, vegetation biomass and composition, fauna, and water storage; however, this is not supported by studies. In the present study, our objective was to assess the impact of exclosures on soil properties, and relate the age of exclosures to their effectiveness in improving soil chemical and physical properties. Five and ten years closed areas had significantly (p<0.05) higher levels for soil organic matter, total nitrogen, and available phosphorus compared to free grazing lands, and the highest levels in were observed in closed areas at footslope position. Our results show that exclosures are not only effective in restoring vegetation, but also in improving soil …
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