Agroforestry parklands are a common land-use in Ethiopia and many parts of the tropics. These systems play an important role in climate change mitigation and adaptation, through carbon (C) sequestration. However, C sequestration in both tree biomass and soil has not been extensively studied for parklands of the Central Rift Valley (CRV), Ethiopia. Therefore, here we sampled a small number of F. albida trees and soil from the Adulala watershed, CRV, to provide a preliminary estimate of the C sequestration potential of these systems. Mean above-ground total dry biomass of trees was estimated at 844 kg tree−1. Tree density was 5.80 ha−1, which corresponded to 2.45 t C ha−1 in above-ground biomass and 0.76 t C ha−1 below-ground; and 118 t C ha−1 in soil (0–80 cm depth) under trees, compared to 84 t C ha−1 in the soil of crop-only areas. We speculate that if tree density was increased to 100 trees ha−1, the rate of soil C sequestration could be estimated as 0.48 t C ha−1 year−1 for 42 years. Faidherbia albida tree density is sparse in the study area, but could be increased by encouraging farmers to protect planted seedlings or natural regeneration.

Authors: Dilla, A.M.; Smethurst, P.J.; Barry, K.; Parsons, D.

Subjects: agroforestry, parklands, land use, climate change

Publication type: Journal Article, Non-ISI, Publication

Year: 2019

ISSN: 1472-8028

DOI: https://doi.org/10.1080/14728028.2018.1564146