Storage and distribution of soil organic carbon, total nitrogen and CO2 emissions in top and subsoils of different land use types in semi-arid tropical soils

Chukwuebuka Christopher Christopher Okolo1, Girmay Gebresamuel2, Amanuel Zenebe3, Mitiku Haile2, Jephter Ebuka Orji4, Chinyere Blessing Okebalama Dr5, Chinedu Emmanuel Eze6, Emmanuel Eze7 and Peter Eze8, (1)Jimma University, Natural Resources Management, Jimma, Ethiopia, (2)Mekelle University, Land Resources Management and Environmental Protection, Mekelle, Ethiopia, (3)Mekelle University, Land Resources Management and Environmental Protection; Institute of Climate and Society, Mekelle, Ethiopia, (4)Alex Ekwueme Federal University Ndufu-Alike, Ndufu-Alike, Nigeria, (5)University of Nigeria, Soil Science, Nsukka, Nigeria, (6)Michael Okpara University of Agriculture Umudike, Umudike, Nigeria, (7)University of Heidelberg, Institute of Geography & Heidelberg Center for the Environment (HCE), Heidelberg, Germany, (8)Botswana International University of Science and Technology, Gaborone, Botswana