Estimation of stability-related soil properties using mid-infrared spectroscopy for non-agricultural land use in Lake Victoria basin, Kenya

2015 ◽  
Vol 81 (2-4) ◽  
pp. 79-94
Author(s):  
B. K. Waruru ◽  
K. D. Shepherd ◽  
G. M. Ndegwa ◽  
A. Sila ◽  
P. T. Kamoni
2015 ◽  
Vol 33 (1) ◽  
pp. 99-106 ◽  
Author(s):  
Johana P. Bonett ◽  
Jesús H. Camacho-Tamayo ◽  
Leonardo Ramírez-López

Techniques such as mid-infrared (MIR) spectroscopy can be used to identify the classes and properties of soils with high preci-sion. In the present study, 312 soil samples of different orders, representative of Colombian agricultural zones, were studied, among which are found Inceptisols and Verisols of the Sinú valley (Córdoba), Andisols of the Eastern Andes Mountain range (Cundinamarca), and Oxisols of the Eastern plains of Colombian (Meta), with the aim of evaluating the ability of mid-infrared spectroscopy to estimate soil properties such as organic carbon, Ca, Mg, Na, K, P, Al, and pH. The results obtained through the analysis of the curves allowed observing that the greatest number of properties are reflected in the spectral region be-tween 400 and 850 cm<sup>-1</sup>. The Inceptisols and Vertisols gave the best results in the calibration of the models for the majority of the properties, followed by the Andisols and finally the Oxisols, which did not show good results. In the descriptive analysis, the observed values showed a behavior similar to the values predicted from the models, for those properties with representa-tive spectral models. The majority of the properties did not show a normal distribution, and the coefficients of variation were very high.


2021 ◽  
Vol 16 (2) ◽  
pp. 335-345
Author(s):  
Dancan Otieno Onyango ◽  
Christopher O. Ikporukpo ◽  
John O. Taiwo ◽  
Stephen B. Opiyo

The socio-economic and ecological value of Lake Victoria is threatened by significant regional development and urbanization. This study analyzed spatial-temporal land use/land cover changes in the Kenyan Lake Victoria basin from 1978–2018 using Landsat 3, 4-5 and 8 imagery, with a view to identifying the extent and potential impacts of urbanization on the basin. Supervised image classification was undertaken following the Maximum Likelihood algorithm to generate land use/land cover maps at ten-year intervals. Results indicate that the basin is characterized by six main land use/land cover classes namely, agricultural land, water bodies, grasslands and vegetation, bare land, forests and built-up areas. Further, the results indicate that the basin has experienced net increases in built-up areas (+97.56%), forests (+17.30%) and agricultural land (+3.54%) over the last 40 years. During the same period, it experienced net losses in grassland and vegetation (-37.36%), bare land (-9.28%) and water bodies (-2.19%). Generally, the changing landscapes in the basin are characterized by conversion of natural environments to built-up environments and driven by human activities, urban populations and public policy decisions. The study therefore recommends the establishment of a land use system that creates a balance between the ecological realm and sustainable development.


2016 ◽  
Vol 101 ◽  
pp. 47-56 ◽  
Author(s):  
A.J. Thougnon Islas ◽  
K. Hernandez Guijarro ◽  
M. Eyherabide ◽  
H.R. Sainz Rozas ◽  
H.E. Echeverría ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document