Infiltration characteristics of volcanic sloping soils on Mt. Elgon, Eastern Uganda

Bamutaze, Yazidhi; Tenywa, Moses; Mwanjalolo, Majaliwa; Vanacker, Veerle; Bagoora, Festus; Magunda, M. K.; Obando, Joy Apiyo; Wasige, John Ejiet

doi:10.1016/j.catena.2009.09.006

Cited by 34 publications

(32 citation statements)

References 30 publications

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“…High variability in infiltrability is commonly reported (Bamutaze et al, 2010;Lal, 1996). Similar values to those reported here for the CV of infiltrability (33-81 %) were obtained by Van de Genachte et al (1996) in a rain forest in Guyana.…”

Section: Years Sincesupporting

confidence: 76%

Soil property changes over a 120-yr chronosequence from forest to agriculture in western Kenya

Nyberg

Bargués‐Tobella²,

Kinyangi

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. Much of the native forest in the highlands of western Kenya has been converted to agricultural land in order to feed the growing population, and more land is being cleared. In tropical Africa, this land use change results in progressive soil degradation, as the period of cultivation increases. Both rates and variation in infiltration, soil carbon concentration and other soil parameters are influenced by management within agricultural systems, but they have rarely been well documented in East Africa. We constructed a chronosequence for an area of western Kenya, using two native forest sites and six fields that had been converted to agriculture for up to 119 yr.We assessed changes in infiltrability (the steady-state infiltration rate), bulk density, proportion of macro-and microaggregates in soil, soil C and N concentrations, as well as the isotopic signature of soil C (δ 13 C), along the 119-yr chronosequence of conversion from natural forest to agriculture. Infiltration, soil C and N decreased within 40 yr after conversion, while bulk density increased. Median infiltration rates fell to about 15 % of the initial values in the forest, and C and N concentrations dropped to around 60 %, whilst the bulk density increased by 50 %. Despite high spatial variability, these parameters have correlated well with time since conversion and with each other.

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Section: Years Sincesupporting

confidence: 76%

Soil property changes over a 120-yr chronosequence from forest to agriculture in western Kenya

Nyberg

Bargués‐Tobella²,

Kinyangi

et al. 2012

Hydrol. Earth Syst. Sci.

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“…Elgon, a distinct stratification of crop production according to altitude is evident. In the lower to medium altitudinal zones (up to 1800 masl), the landscape typically depicts composite hillslopes in terms of the slopes and land use characterized by scattered planted trees largely eucalyptus, annual and perennial cropping (Bamutaze, Tenywa, Majaliwa, Palesjo, et al, 2010;Bamutaze, Tenywa, Majaliwa, Vanacker, et al, 2010;Okwuosa, 2012). Cultural factors and attitudes also have a strong influence on land use systems, especially among the Mt.…”

Section: Introductionmentioning

confidence: 98%

“…It is vital for farmers to have a good comprehension of these variations and how they influence the productivity of the land in form of soil fertility as well as rainfall conditions (Mugagga et al, 2010(Mugagga et al, , 2011Okwuosa, 2012); so that they are able to come up with suitable cropping systems and tillage practices at different landscape positions for enhancement of soil and water conservation (Bamutaze, Tenywa, Majaliwa, Vanacker, et al, 2010). Yimer, Ledin, and Abdelkadir (2006) assessed variations in soil properties along three vegetation gradients in the Bale Mountains of south-eastern Ethiopia.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, soil properties varied with differences in vegetation communities and topography. Furthermore, Bamutaze, Tenywa, Majaliwa, Vanacker, et al, (2010) studied the infiltration characteristics of volcanic soils on Mt. Elgon Uganda of field sites that were randomly selected across a topographic gradient and they concluded that infiltration rates are correlated to slope gradient.…”

Section: Introductionmentioning

confidence: 99%

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A field assessment of land use systems and soil properties at varied landscape positions in a fragile ecosystem of Mount Elgon, Uganda

Oyana

Kayendeke

Bamutaze

et al. 2014

African Geographical Review

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The purpose of this field study was to identify and characterize land use systems at varied spatial hierarchies, and to differentiate soil properties along varied landscape positions. Key data about existing land use systems and soil properties were systematically collected in 12 sites. Topographic profiles across catchment and geomorphic units were identified to show the relation typical of a mountain ecosystem. We found statistically significant differences (p < .05) in soil properties along altitudinal gradients in 52% of the samples and also in land use and land cover distribution characteristics along the slope gradients. The most dominant soils were sandy loam on the hillslopes and clay loams at the footslopes; and most of the cultivated fields were located on slopes ranging from 0 to 17%. The livestock production system was based on a small constructed unit with a capacity to enable feed resources. Soil conservation practices that were evident among the study sites included the use of mulching, hedgerows, intercropping, fallowing, and minimum tillage. Deep empirical knowledge of this system will further advance our understanding on how a fragile ecosystem responds to both natural and human-caused change, and its associated impact on the surrounding environment.

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“…To clarify soil infiltration characteristics, which are important for the irrigation scheme design and irrigation quality evaluation, the infiltration model is commonly used to quantitatively simulate soil infiltration processes. Accordingly, many experimental and theoretical studies have been devoted to unravelling the infiltration mechanisms associated with different irrigation methods [5][6][7][8]. However, little research on the infiltration model of vertical line source irrigation has been reported.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Infiltration Model for Predicting Cumulative Infiltration during Vertical Line Source Irrigation

Fan

Huang

Gong

et al. 2018

Water

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Vertical line source irrigation is a water-saving irrigation method for enhancing direct water and nutrient delivery to the root zone, reducing soil evaporation and improving water and nutrient use efficiency. To identify its influencing factors, we performed computer simulations using the HYDRUS-2D software. The results indicate that for a given soil, the line source seepage area, but not the initial soil water content and buried depth, has a significant effect on the cumulative infiltration. We thus proposed a simplified method, taking into account the seepage area for predicting the cumulative infiltration based on the Philip model. Finally, we evaluated the accuracy of the simplified method using experimental data and found the cumulative infiltrations predicted by the simplified method were in very good agreement with the observed values, showing a low mean average error of 0.028-0.480 L, a root mean square error of 0.043-0.908 L, a percentage bias of 0.321-0.900 and a large Nash-Sutcliffe coefficient close to 1.0 (NSE ≥ 0.995). The results indicate that this simplified infiltration model, for which the only emitter parameter required is the seepage area, could provide a valuable and practical tool for irrigation design.

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Infiltration characteristics of volcanic sloping soils on Mt. Elgon, Eastern Uganda

Cited by 34 publications

References 30 publications

Soil property changes over a 120-yr chronosequence from forest to agriculture in western Kenya

Soil property changes over a 120-yr chronosequence from forest to agriculture in western Kenya

A field assessment of land use systems and soil properties at varied landscape positions in a fragile ecosystem of Mount Elgon, Uganda

A Simplified Infiltration Model for Predicting Cumulative Infiltration during Vertical Line Source Irrigation

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