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 Printable version |
Soil protection in mountainous areas of Tunisia with the northern sulla (Hedysarum coronarium L.) |
Science et changements planétaires / Sécheresse. Volume 22, Number 2, 117-24, Avril-Juin 2011, Dynamique paysagère des terres arides et expériences réussies de restauration écologique., Articles de recherche
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 Résumé
Article gratuit
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Author(s) : Slim Slim, Faysal Ben Jeddi |
Summary : In an agricultural development action, a forage crop using the northern sulla (
Hedysarum coronarium L.) cultivar Bikra 21 was used to solve soil erosion problems in the Tunisian semi-arid mountainous areas of Massouge (Siliana) and Tlili Salhi (Zaghouan). The assessment of erosion and the sulla impact in edaphic substrates were investigated using sulla, durum wheat (
Triticum durum Desf.) and fallow crops. These crops were evaluated using different slopes of 4, 8, and 12%. A rainfall simulator was installed in these crops to determine the level of erosion resulting from a cumulative artificial rainfall of 170mm collected over 60 minutes. Sulla cover reduces water runoff from 6.3 to 6.8 times as compared to fallow and wheat. Water infiltration ranged from 99 to 96.6% respectively on a slope of 4 and 12% for sulla. However, wheat induced a relatively limited infiltration of water (76.7%) on 12% slope. The physico-chemical analysis of sediment transported by erosion showed that clay predominates in all cases, with 54 to 56%. Similarly, higher concentrations of nitrogen were major components of these sediments (from 28 to 36ppm). The organic matter of the eroded materials (3.8%) represents a land degradation indicator of the water erosion. |
Keywords : erosion control, infiltration, sediment, simulation, Tunisia, water erosion, water runoff |
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