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This article in SSSAJ

  1. Vol. 75 No. 1, p. 246-256
     
    Received: Apr 23, 2010
    Published: Jan, 2011


    * Corresponding author(s): wolde_mekuria@yahoo.com
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doi:10.2136/sssaj2010.0176

Restoration of Ecosystem Carbon Stocks Following Exclosure Establishment in Communal Grazing Lands in Tigray, Ethiopia

  1. Wolde Mekuria *a,
  2. Edzo Veldkampa,
  3. Marife D. Correa and
  4. Mitiku Haileb
  1. a Soil Science of Tropical and Subtropical Ecosystems, Buesgen Institute, Georg-August Univ. of Goettingen, Buesgenweg 2, 37077 Goettingen, Germany
    b Dep. of Land Resources Management and Environmental Protection, Mekelle Univ., P.O. Box 231, Mekelle, Ethiopia

Abstract

Degraded lands are common in human-influenced tropical semiarid areas, and the potential for C sequestration through rehabilitation of these areas is substantial. In this study, we investigated changes in ecosystem C stocks (ECS) after establishing exclosures on degraded communal grazing lands, and identified easily measurable biophysical and management-related factors that can be used to predict ECS restoration in the highlands of Tigray, Ethiopia. We selected replicated (n = 3) 5-, 10-, 15-, and 20-yr-old exclosures and paired each exclosure with an adjacent communal grazing land. All exclosures displayed higher ECS than the communal grazing lands. Differences in ECS between exclosures and grazing lands varied between 29 (±4.9) and 61 (±6.7) Mg C ha−1 and increased with exclosure duration. In exclosures, much of the variability in ECS was explained by a combination of the following variables: precipitation, clay content, vegetation canopy cover, woody biomass, and exclosure duration (R 2 = 0.77–0.90). Precipitation and vegetation canopy cover also explained much of the variability of ECS in communal grazing lands (R 2 = 0.48–0.55). Our results help to establish baseline information for C sequestration projects and to predict the expected ecosystem C sequestration under exclosures. Expansion of exclosures would increase grazing pressure on the remaining communal grazing area. Therefore, the decision to establish additional exclosures should also include an economic analysis and an evaluation of the social consequences.

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