Effects of change in population, household conditions and farming practices on agricultural land use in the Volta River basin of Ghana, 1984-2000

Erdkunde ◽  
2005 ◽  
Vol 59 (2) ◽  
pp. 126-135 ◽  
Author(s):  
Samuel N. A. Codjoe ◽  
Eckart Ehlers ◽  
Paul L. G. Vlek
Author(s):  
P. Jyothirmayi ◽  
B. Sukumar

The land is a delineable area of the earth's surface, encompassing all attributes of the biosphere immediately above or below this surface. Physical characteristics of the land determine agricultural land use. Among them, relief and slope play an important role. Aim of this study is to establish the relationship of relief and slope with agricultural land use in Valapattanam River basin in Kannur district using GIS and Remote sensing. The Survey of India Topographic maps in 1:50000 scale was used as a base map for delineating the basin. Contours were digitized and Digital Elevation Model (DEM) was generated. Agricultural land use map was prepared using satellite digital data by the digital image processing method using ERDAS IMAGINE image processing software. Agricultural land use map was intersected with the relief and slope classes in ArcGIS software. Areas were calculated and the trend of agricultural land use patterns was studied. The study revealed that there is a strong correlation between Agricultural land use and relief and slope in the Valapattanam River basin. Most of the area under paddy, coconut, mixed crops like banana and tapioca concentrated below 20 m height in the coastal plain and valley regions of the basin. Rubber mostly cultivated between 100 and 300 meters with slopes between 3 to 12 degrees. Agriculture is limited up to 18-degree slope and 300 m height. Areas of more than 300 m height are occupied mostly by forest.


Author(s):  
Manoj Kumar Mahato ◽  
N. C. Jana

The present study is concerned with the analysis of landform characteristics of Salda River basin and its impact on agriculture land use pattern. The Salda basin is one of the sub-basins of Subarnarekha River, with diversified landscape pattern in the western part of Purulia district in West Bengal. This basin is constituted by plateaus, plains with terraces, scarps, inselbergs, which is evolved under polycyclic evolution. The development of polycyclic geomorphic processes in this basin is typified by diverse morphology and drainage, which largely influence the land use pattern in this area. These diverse landscape patterns indicate the interaction of litho-tectonic-structural and various geomorphic processes with recent human intervention. The main objectives of the present study are to analyse the landforms characteristics, correlate them with land use and identify problems as well as prospects of agricultural land utilization. The entire study is based on both primary and secondary data. Extensive field survey has been conducted to collect primary information regarding terrain characteristics, micro relief, slope characteristics, hydrological attributes, soil character, natural vegetation, environmental hazards. The Survey of India topographical sheets, meteorological data, agricultural production data, land use and land cover data have been collected for the analysis of geomorphological characteristics, land classification, and agricultural land use pattern. This study reflects the typical land characteristics of the fringe area of Chhotanagpur plateau, where some typical geomorphic attributes control the productivity of the land and also controls the socio-economic conditions of the local people. The present authors have tried to examine the typical geomorphic attributes and their effects on present productivity of the land in a micro level study, where agriculture is the main source of income.


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