Assessment of Leguminous Tree Capacity in Mitigating Global Warming in Nigeria’s Savannah Agroecological Zone in Biu, Bornu State Nigeria

Abstract

This study examined the potential of leguminous trees to mitigate the impacts of global warming, particularly within Nigeria’s savannah agroecological zone. Soil samples were systematically collected using a soil auger at intervals of 5, 10, and 15 metres from tree trunks, with sampling conducted at three soil depths: 0–15 cm, 15–30 cm, and 30–45 cm. Composite soil samples were subsequently taken to the laboratory for analysis. The results revealed that soil organic matter (SOM) content was generally higher beneath the canopy of leguminous trees and decreased from the tree trunk towards the canopy margin. However, soil pH and moisture content exhibited different patterns. To mitigate the effects of global warming and improve soil quality, the study recommends integrating at least 25 leguminous trees per hectare into farming systems within Nigeria’s savannah agroecological zone.