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Download TAAG Book of Abstracts - Tropical Biology Association

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Status <strong>of</strong> Soil Properties and Wheat Production under<br />

Parkland Agr<strong>of</strong>orestry at Beressa Watershed in Gurage<br />

Zone, Central Ethiopia<br />

Gosaye Degu Belay<br />

Hawassa University, WondoGenet Collage <strong>of</strong> Forestry<br />

and Natural Resources, Ethiopia<br />

Email for correspondence:gosayede@yahoo.com<br />

Abstract<br />

This study was conducted in Gurage administrative Zone<br />

<strong>of</strong> Central Ethiopia and was intended to assess and<br />

document the dimensional effect <strong>of</strong> trees (Faidherbia<br />

albida, Cordia africana, Croton macrostachyus, Persea<br />

americana) on soil fertility and wheat crop. In the<br />

selection <strong>of</strong> appropriate trees, uniformity in topography<br />

and history <strong>of</strong> cropping practice was considered. The<br />

sampling procedure for agronomy and soil properties<br />

under the parkland tree species at different radii (0.5m,<br />

1m, 2m and 10m) from tree trunk and soil layer (0-20cm<br />

& 20-40cm) was followed accordingly. Different soil<br />

physical properties (texture, moisture, and soil bulk<br />

density) and chemical properties (total nitrogen,<br />

available phosphorus, cation exchange capacity (CEC),<br />

pH, organic carbon, electrical conductivity (EC),<br />

potassium (K), Calcium (Ca), Magnesium (Mg) and<br />

Sodium (Na)) were analyzed. Based on the laboratory<br />

result large amount <strong>of</strong> soil nutrient is found on top soil<br />

layer than bottom and near to the tree trunk than away.<br />

Specifically significant differences were observed<br />

between 0-20cm and 20-40cm depths for bulk density<br />

under C. mycrostachus compared to the control. Little<br />

variation was observed for texture among the different<br />

tree species and distances. Soil pH and electrical<br />

conductivity were significantly different at 0-20cm and<br />

20-40cm depths for soil sample taken from P.<br />

americana. Exchangeable potassium shows significant<br />

difference between the two depths at one and two<br />

meter from all parkland tree species. Based on the<br />

agronomic result <strong>of</strong> the research, F. albida has increased<br />

the yield more than 50% as compared with the control.<br />

However for the rest tree species (C. africana, C.<br />

macrostachyus, and P. americana) the highest yield is at<br />

the control. As a general recommendation awareness <strong>of</strong><br />

the local people about the economic importance <strong>of</strong><br />

F.albida tree should be created through extension<br />

services.<br />

The Vulnerability <strong>of</strong> the Coast <strong>of</strong> Liberia to Marine Oil<br />

Spills: Implications for Biodiversity and Renewable<br />

Natural Resource Utilization<br />

Darlington Saykay Tuagben<br />

USAID, Liberia<br />

Email for correspondence:d.tuagben@gmail.com<br />

Abstract<br />

The West African coastline has become a “hotspot” for<br />

oil production and 17 oil exploration blocks have been<br />

designated <strong>of</strong>f Liberia’s 579 km coastline which supports<br />

about 60% <strong>of</strong> the human population. There is a potential<br />

for conflict between oil production, existing human<br />

activities and biodiversity. This study aims to establish<br />

the level <strong>of</strong> dependency <strong>of</strong> rural coastal households on<br />

natural resources and assess this potential conflict with<br />

a goal to contribute to biodiversity conservation efforts<br />

in Liberia. Published literatures were reviewed to assess<br />

the vulnerability <strong>of</strong> coastal and marine resources and<br />

inhabitants to oil spills events followed by household<br />

surveys in seven coastal counties adjacent to ten <strong>of</strong> the<br />

17 <strong>of</strong>fshore oil exploration blocks. Average household<br />

size (N=10) was similar in all sites. The coastal zone <strong>of</strong><br />

Liberia comprises sensitive environments all <strong>of</strong> which<br />

are vulnerable to oil pollution to varying degrees.<br />

Mangroves, estuaries and coastal lagoons are important<br />

spawning, roosting and breeding sites for fish and other<br />

wildlife, whereas sandy beaches are used for recreation<br />

and breeding grounds for five species <strong>of</strong> marine turtles.<br />

Coastal inhabitants rely heavily on the utilization <strong>of</strong><br />

coastal and marine resources for their livelihoods and<br />

income. Fishing and several other income sources might<br />

be lost in the event <strong>of</strong> a large oil spill, increasing poverty<br />

and food insecurity. There is an urgent need to develop<br />

an oil spill contingency plan and a waste management<br />

plan that will consider both biodiversity conservation<br />

and human safety and wellbeing.<br />

Keywords: Oil spills, Coastal vulnerability, Community<br />

livelihoods, Biodiversity conservation, Human safety,<br />

Contingency plan<br />

Keywords: agronomy, soil physical properties,<br />

agr<strong>of</strong>orestry, Faidherbia albida<br />

<strong>TAAG</strong> First African Student’s Conference, Nairobi. 2-4 July, 2013 57

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