Soil organic carbon and total nitrogen stocks under different land uses in a semi-arid watershed in Tigray, Northern Ethiopia

Gelaw, Aweke Mulualem; Singh, Bal Ram; Lal, Rattan

doi:10.1016/j.agee.2014.02.035

Cited by 208 publications

(117 citation statements)

References 54 publications

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“…However, this finding is inconsistent with Yang et al (2004), who pointed out that the conversion of secondary forests to rubber plantations did not change the soil C stock deeper than 40 cm. This study also differs from Gelaw, Singh and Lal [22], where there was no significant difference in the soil C stock of different agroforestry ecosystems when the soil was deeper than 30 cm because the soil disturbances only happened in the top layer of the soil.…”

Section: Land Use Change Reduced Soil Cmentioning

confidence: 41%

Ecosystem Carbon Stock Loss after Land Use Change in Subtropical Forests in China

Fan

Guan

et al. 2016

Forests

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Converting secondary natural forests (SFs) to Chinese fir plantations (CFPs) represents one of the most important (8.9 million ha) land use changes in subtropical China. This study estimated both biomass and soil C stocks in a SF and a CFP that was converted from a SF, to quantify the effects of land use change on ecosystem C stock. After the forest conversion, biomass C in the CFP (73 Mg¨ha´1) was significantly lower than that of the SF (114 Mg¨ha´1). Soil organic C content and stock decreased with increasing soil depth, and the soil C stock in the 0-10 cm layer accounted for more than one third of the total soil C stock over 0-50 cm, emphasizing the importance of management of the top soil to reduce the soil C loss. Total ecosystem C stock of the SF and the CFP was 318 and 200 Mg¨ha´1, respectively, 64% of which was soil C for both stands (205 Mg¨ha´1 for the SF and 127 Mg¨ha´1 for the CFP). This indicates that land use change from the SF to the CFP significantly decreased ecosystem C stock and highlights the importance of managing soil C.

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Section: Land Use Change Reduced Soil Cmentioning

confidence: 41%

Ecosystem Carbon Stock Loss after Land Use Change in Subtropical Forests in China

Fan

Guan

et al. 2016

Forests

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“…During the last century, the expansion of agriculture to support the growing population was in general achieved by massive deforestation that has been followed by soil degradation (Bewket 2002;Gelaw et al 2014). Over much of the country this has transformed forests and woodlands into agricultural land with scattered trees (Tesfaye et al 2014).…”

Section: Abstract Characterization á Farmer Managed Natural Regeneratmentioning

confidence: 99%

“…Trees on farms are characteristic of a large part of the Ethiopian agricultural landscape today, while tree species distribution and management intensity varying with agro-ecological conditions principally defined by rainfall, altitude, and soil type (Poschen 1986;Teklay et al 2007;Gelaw et al 2014). It is common for farmers to manage natural regeneration of trees (FMNR) within crop fields by protecting seedlings and young trees, mostly native species that have germinated from soil seedbanks (Poschen 1986).…”

Section: Abstract Characterization á Farmer Managed Natural Regeneratmentioning

confidence: 99%

“…This can mitigate and reverse deforestation and land degradation with large potential for soil organic carbon and nitrogen sequestration (Bewket 2002;Mekuria and Aynekulu 2013;Gelaw et al 2014). The positive relationship between higher rural population and tree cover observed by Tiffen et al (1994) in semi-arid Kenya has been also reported in the Blue Nile basin as tree cover has been restored over the last four decades as a result of local initiatives to plant trees at the household level along with community afforestation and forest protection (Bewket 2002).…”

Section: Abstract Characterization á Farmer Managed Natural Regeneratmentioning

confidence: 99%

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Understanding patterns of tree adoption on farms in semi-arid and sub-humid Ethiopia

et al. 2016

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Trees on farms are a widespread feature of landscapes across a large part of Ethiopia with an important role in enhancing the resilience of smallholder livelihoods through the provision of ecosystem services. Despite their importance, little is known about what trees are planted or retained from natural regeneration by different types of farmers that results in the pattern of tree cover found in the region. We address this knowledge gap through analysis of household survey data from semi-arid and sub humid areas of Oromia regional state. A set of composite variables that represent distinctive patterns of tree cover on farms were derived from principal component analysis and Pearson correlation analysis. This revealed two major tree adoption strategies: farmer managed natural regeneration (FMNR) of trees to meet subsistence needs as well as contributing to other ecosystem services; and, high value agroforestry (HVAF) involving planted trees used largely to produce fruits, timber and fodder. Regression analysis further identified fine-scale variation in ecological and socio-economic factors that affect which of these two broad strategies are adopted by farmers. Favorable climatic conditions coupled with institutional arrangements to control free grazing were pre-conditions for HVAF, whereas poor biophysical potential and sloping land provided a positive incentive for farmers to adopt FMNR. Farmers with preferences for tree species with multiple utilities and locational flexibility favored FMNR while adoption of HVAF was more assetdriven. Our findings reveal that farmers integrate many native and exotic tree species on their farms to meet their variable farm conditions, needs and asset profiles in stark contrast to most tree promotion efforts that focus on a few, usually exotic, tree species. We recommend that future agroforestry promotion should embrace a diversity of tree species appropriate to matching the fine scale variation in ecological conditions and farmer circumstances encountered in the field.

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“…Tillage in our long-term predictions, was simulated every 7 years, this was linked to a modelled increase in soil C stock. The modelled increases in soil C in the surface soil predicted by the model also fit with measured findings of other, which have suggested increases in soil C stock for the surface layers even in field conditions with high C decomposition rates (GILLABEL et al, 2007;DENEFT et al, 2008;GELAW et al, 2014). As was found in the modelling and field measurements of this study, Deneft et al (2008) also found increased soil C stocks in the surface soil (0-20 cm) due to the use of pivot-irrigating in a cultivated system compared to a dryland cultivated area.…”

Section: Discussionsupporting

confidence: 65%

Evaluation of soil carbon stocks in response to management changes in sugarcane production

Zani¹

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Soil organic carbon and total nitrogen stocks under different land uses in a semi-arid watershed in Tigray, Northern Ethiopia

Cited by 208 publications

References 54 publications

Ecosystem Carbon Stock Loss after Land Use Change in Subtropical Forests in China

Ecosystem Carbon Stock Loss after Land Use Change in Subtropical Forests in China

Understanding patterns of tree adoption on farms in semi-arid and sub-humid Ethiopia

Evaluation of soil carbon stocks in response to management changes in sugarcane production

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