Agriculture influences and shapes the world’s ecosystems, but not always in a positive way. More than 2.5 billion people are globally involved as stewards of land and water ecosystems that constitute the natural resource base for feeding the current and future world population. Yet, conventional agronomic interventions based on ‘hard’ agricultural engineering compromise various eco-services that are required for sustainable agricultural development.
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Library ResourceArticles et Livresdécembre, 2018Égypte, Soudan, Kenya, République-Unie de Tanzanie, Afrique australe, Afrique du Sud, Nigéria, Mexique, Brésil, Colombie, Équateur, Pérou, États-Unis d'Amérique, Japon, Philippines, Iran, Népal
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Library ResourceRapports et recherchesjuillet, 2018Afrique septentrionale, Tunisie
Soil erosion is a natural process causing serious land degradation problems. In Tunisia, soil
erosion represents a serious environmental problem. The Rmel watershed located in the
Governorate of Zaghouan in north-eastern Tunisia and covering an area of 679 square
kilometers, suffers from this problem. It was thus selected to estimate annual soil loss using the
Revised Universal Soil Loss Equation (RUSLE), and geographic information system (GIS).
RUSLE model’s parameters (R, K, LS, C, and P) were derived from digital elevation model -
Library ResourceDocuments de politique et mémoiresseptembre, 2018Afrique septentrionale, Tunisie
Stipagrostis pungens is a perennial grass species which belongs to the Poaceae family. It is usually found with several erect culms, grows up to 1.5 m in height, and forms substantial tufts. It is a tall stiff glabrous grass with pungent leaves, and a C4 grass with sclerophyllous, spine-tipped, inrolled leaves, with sunken stomata. The root system extends laterally for a radius of 20 m or more. The roots are covered throughout their length by a sandy sheath, which is penetrated by the root hairs that occur throughout the entire length of the sheath.
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