Title: Effectiveness of tropical grass species as sediment filters in the riparian zone of Lake Victoria
Other Titles: Tropical grass species as sediment filters
Authors: Wanyama, Joshua ×
Herremans, Kristof
Maetens, Willem
Isabirye, M.
Kahimba, Frederick
Kimaro, Didas
Poesen, Jean
Deckers, Seppe #
Issue Date: Sep-2012
Publisher: Published for the British Society of Soil Science by Blackwell Scientific Publications
Series Title: Soil Use and Management vol:28 issue:3 pages:409-418
Abstract: The effectiveness of tropical grass species in strips of different length in trapping sediment from
cropland was assessed, and the influence of filter length was determined. The assessment was made
under natural rainfall which induced sheet and rill erosion in run-off plots and then using simulated
run-off which caused concentrated erosion. The evaluated grasses were elephant grass, lemon grass,
paspalum and sugarcane. Run-off plots were on a 10% slope in a randomized complete block design
replicated three times. Filter lengths were 2.5, 5 and 10 m against a 10-m-long sediment source area
planted with maize on a clay loam soil. The results show that sediment trapping effectiveness (TE)
increases nonlinearly with increasing filter length for all grasses. Under natural rainfall, more than 70%
of sediment was trapped in the first 5 m, and lengthening the strip to 10 m only resulted in a marginal
increase in TE. With concentrated run-off, more than 70% of sediment was trapped in the first 5 m
and lengthening the strip to 10 m resulted in a significant increase in TE. Paspalum and lemon grass
performed significantly better than other grasses (P < 0.05), owing to their spreading growth pattern
over the soil surface. Paspalum also has the highest root density in the upper 0.3-m layer of the soil
followed by lemon grass, hence offering the greatest resistance to erosion from concentrated flow. The
results demonstrate that tropical grass filter strips provide a viable means for reducing the sediment flux
from cropland.
ISSN: 0266-0032
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geography & Tourism
Division Soil and Water Management
× corresponding author
# (joint) last author

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