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Assessing soil erosion and conservation with various methodologies at different scales. MOROCCAN DESIRE TEAM. Symposium Assessing benefits of SLM-Key for success. Rabat 2009. Sehoul is located between Oued Bouregreg and Grou.

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Assessing soil erosion and conservation with various methodologies at different scales

MOROCCAN DESIRE TEAM

Symposium

Assessing benefits of SLM-Key for success

Rabat 2009

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Sehoul is located between Oued Bouregreg and Grou

is part of the natural geographic unit "Plateau Central Marocain".

Marginal land with a high rate of poverty and important indicators of degradation

Land degradation, characterized by high variability and chronic shortage in term of natural resources.

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The assessed approaches

Assisted regeneration of cork oak

Rainfed tree plantation: olive associated with annual cultivation

Fodder cultivation: e.g. the lupine

Crop rotation Cereal / leguminous

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Crop rotation: Cereal / Leguminous

1- Increased soil protection by providing better cover

Cereal / leguminous rotation vegetation cover reached 65,5%

Cereal / Cereal rotation  vegetation cover is < 50 %

2- Maintaining and improving soil fertility

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3- Improving soil structural stability

Crop rotation (cereal/leguminous): Improves soil resistance to compaction and limits surface crusting.

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The Rainfed fruit tree plantation associated with annual cultivations

1- Protecting the soil surface (vegetation cover)

In the olive grove (15 years), we recorded the most important herbaceous cover (66%). However, the average cover of herbaceous in the rotation Cereal / Cereal does not exceed 52,5%.

2- Improvement of soil fertility and surface characteristics

fodder cultivation the lupine
Fodder cultivation: (the lupine)

Lupin: offers the best vegetation cover

Offers a medium organic matter content in the soil.

assessment of soil erosion by 137 cs measurements
Assessment of soil erosion by 137Cs measurements

barley/wheat rotation

vine monoculture

leguminous/ wheat rotation

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Medium termassessmentof Erosion rates ~50 years

Less erosion for

wheat /leguminous crop rotation

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Rainfall simulation technique:

Soil loss and runoff coefficient under different land use

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HYDROLOGIC MEASUREMENTS/ THE Hannanat catchement

Water balance in 2008-2009

rainfall 726,7mm

Runoff coefficient : 10%

hydrologic behaviour at the experimental micro catchment
Hydrologic behaviour at the experimental micro catchment :

winter

Autumn

  • In winter : rainfall events are longer and complicated compared to the autumnal period. Most of rainfall events shows a runoff coefficient lower than 5%.
  • In autumn: the flood hydrograph shows a quick response. The peak discharges are around several hundreds of liters per second (469 l/S) with a Runoff coefficient up to 54%.
surface runoff and erosion modelling
Surface runoff and erosion modelling
  • Our will is to model the Surface runoff, using a Model (for example the LISEM).
  • This modelling will permit to imagine scenarios of functioning of the watershed in relation with the global changes expected to be recorded in the area, first the scenario of success of the WSC actions our team is implementing, but also other scenarios of change like climatic change or land use and land cover transformations.
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Conclusion

Crop rotation Cereal / Leguminous seems to be a good strategy to use in Sehoul

But there is need for providing fodder

Study of vegetation cover, soil fertility, soil texture and moisture.

Use of 137Cs measurements

Soil loss and runoff coefficient

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Enable to understand the soil behaviour at the catchment scale and to evaluate the global soil loss

Study of Water balance

Hydrologic behavior