Jibril, Mamman Shaba
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EFFECTS OF HUMAN ACTIVITIES ON THE AFAKA AFFORESTATION PROJECT, KADUNA NORTH, KADUNA STATE, NIGERIA Jibril, Mamman Shaba; Ariyo, Mary Oluyemisi; Butu, Ali Williams; Emeribe, Chukwudi Nnaemeka
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol. 5, No. 2
Publisher : UI Scholars Hub

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The study aimed to investigate the effects of human activities on the Afaka afforestation project, Kaduna State, Nigeria. Structured interview was used to evaluate the level of community involvement in the modification of the forest project, their perceived environmental effects of landcover loss. Landsat images of 1986, 1999 and Sentinel-2 image of 2017 were applied for detection of changes in land use/land cover over the years (1986-2017). The study found that the land cover structure of the forest reserve has changed significantly. In 1986, area under crop cultivation was 19.24%, built-up areas, 0.08%, disturbed forest, 7.57%, gully, 2.60%, riparian vegetation, 2.78% and undisturbed forest, 61.49%. However, by 2017, there were significant changes as the area under crop cultivation 41.18%, built-up areas 0.17%, disturbed forest, 43.17%, gully 5.6%, riparian vegetation 4.66% and undisturbed forest, 1.66%, implying intensive human impacts on the Kaduna Afforestation project in recent time. This could be traced to the increased level of poverty in the community as 75% of the respondents who cannot afford alternative energy supplies such as kerosene and National grid-based electricity, rely on felling of trees for cooking. On the perceived effects of the afforestation project modification, reduced plantation size was 60.5%, decreased soil fertility 19.5%, reduced non-timber products, 11.1%, sheet erosion 6.1%, while flooding 2.8%. The result of the chi-square test reveals significant changes in the area coverage of the forest cover classification at P<0.05. Thus, it can be concluded that the afforestation project did not meet its objectives. There is need for sustainable programmes and policies towards alleviating poverty among the inhabitants of the study area most of which depend on the forest resources for livelihood. This should be followed up with policies to encourage tree planting initiatives to promote forest restoration and ecological integrity of the study area.
EFFECT OF URBANIZATION ON CHANNEL PLATFORMS OF RIVER KADUNA FROM 1962-2017, KADUNA STATE, NIGERIA Butu, Ali Williams; Emeribe, Chukwudi Nnaemeka; Leke, Dewingong Columbus; Jibril, Mamman Shaba
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol. 4, No. 2
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The study investigated changes in channel planforms of River Kaduna. Topographic maps were complimented with Mosaic of SPOT 5 satellite and Sentinel-2 images. Results showed that except for sinuosity index and channel length, channel width, braiding and channel migration exhibited considerable changes. These changes were evident in reduced velocity and stream energy, the type of sediment being transported, the silt materials being transported in suspension and the coarse sand and gravels being moved by lift and drag processes which are easily deposited, thus causing the channel to contract and braid. Channel migration occurred as gradual bend shifts leaving no evidence of lateral abrasion. Similarly, channel length did not change significantly to affect the sinuosity index. The result further revealed there was little lateral abrasion and the channel are relatively stable, implying that the materials being transported and deposited must have originated from the watershed. Anthropogenic factors such as urbanization, deforestation and agriculture activities contributed significantly to the observed channel alteration. There is a need to encourage mining gravel and sand from braided channels to provide sinks for sediments that otherwise would be deposited downstream. Afforesting the catchment area is required to create canopies to exposed surface and reduce sediment supplies.