Descubre y comparte nuestro conocimiento público

Se han encontrado 109 recursos

Resultados de búsqueda

In the Sahel of West Africa, the productivities of rangelands, croplands and livestock are inextricably linked. Cattle, sheep and goats graze rangelands and crop residues, and their manure/urine is used to fertilize crops. Rangelands provide important feeds during the manuring period, resulting i...


Powell, J.M.Fernández Rivera, S.Hiernaux, Pierre H.Y.Turner, M.D.[Nutrient cycling in integrated rangeland/cropland systems of the Sahel]Nutrient cycling in integrated rangeland/cropland systems of the Sahel

Plant density and tiller cunts were done in several Sahelian rangelands in Mali, under a variety of soil, rainfall and grazing situations. Numeric models were developed to explain the dynamic relationship between grass tillering and herb density. Tests of application of these models to the plant ...


Hiernaux, Pierre H.Y.Leeuw, P.N. deDiarra, L.[Modelling tillering of annual grasses as a function of plant density: Application to Sahelian rangelands productivity and dynamics]Modelling tillering of annual grasses as a function of plant density: Application to Sahelian rangelands productivity and dynamics

The influence of night grazing on feeding behavior, nutrition and performance of cattle was studied. Twenty-four steers weighing 367 kg (SD = 76) grazed either from 0900 to 1900 (day grazers), 2100 to 0700 (night grazers) or 0900 to 1900 and 2400 to 0400 (day-and-night grazers) during 13 weeks. F...


Ayantunde, Augustine A.Fernández Rivera, S.Hiernaux, Pierre H.Y.Keulen, H. vanUdo, H.M.J.[Day and night grazing by cattle in the Sahel]Day and night grazing by cattle in the Sahel

Kergoat, L.Hiernaux, Pierre H.Y.Dardel, C.Pierre, C.Guichard, F.Kalilou, A.[Dry-season vegetation mass and cover fraction from SWIR1.6 and SWIR2.1 band ratio: Ground-radiometer and MODIS data in the Sahel]Dry-season vegetation mass and cover fraction from SWIR1.6 and SWIR2.1 band ratio: Ground-radiometer and MODIS data in the Sahel

An approach for combining remote sensing spectral measurements with an ecosystem model was presented in an accompanying article. The sahelian grassland ecosystem STEP model developed for that purpose was also described and validated. In order to fulfill a prerequisite for using coarse resolution ...


Seen, D. loMougin, E.Rambal, S.Gaston, A.Hiernaux, Pierre H.Y.[A regional sahelian grassland model to be coupled with multispectral satellite data. II. Toward the control of its simulations by remotely sensed indices]A regional sahelian grassland model to be coupled with multispectral satellite data. II. Toward the control of its simulations by remotely sensed indices

An approach to combining remote sensing spectral measurements with an ecosystem process model is presented. In this approach, the ecosystem model is not bound by the sole use of satellite data, but integrates the latter in an explicit formulation of the main processes of vegetation functioning. A...


Mougin, E.Seen, D. loRumbal, S.Gaston, A.Hiernaux, Pierre H.Y.[A regional sahelian grassland model to be coupled with multispectral satellite data. I. Model description and validation]A regional sahelian grassland model to be coupled with multispectral satellite data. I. Model description and validation
Hiernaux, Pierre H.Y.Justice, C.O.[Suivi du developpement vegetal au cours de l'ete 1984 dans le Sahel malien]Suivi du developpement vegetal au cours de l'ete 1984 dans le Sahel malien

Crop growth on acid sandy soils of the Sudano-Sahelian zone is primarily limited by the low amounts of organic matter and available mineral nutrients in the topsoil. The shortening of fallow periods with population growth, the exploitation of fire wood, spatial nutrient transfers by wind and wate...


Buerkert, AndreasHiernaux, Pierre H.Y.[Nutrients in the West African Sudano-Sahelian zone: Losses, transfers and role of external inputs]Nutrients in the West African Sudano-Sahelian zone: Losses, transfers and role of external inputs

Les formes du relief, le sols et la vegetation du secteur de Saye, en zone soudano-sahelienne du Mali Central, ont ete classes en vue d'etablir une base ecologique d'echantillonnage de la phytomasse fourragere. L'interpretation des photographies aeriennes au 50 000 a abouti a la reconnaissance de...


Touré, A.S.Grandtner, M.MHiernaux, Pierre H.Y.[Relief, sols et vegetation d'une savane soudano-sahelienne du Mali central]Relief, sols et vegetation d'une savane soudano-sahelienne du Mali central

The broader ecological and social contexts within which livestock husbandry of Sudano-Sahelian West Africa operates have changed significantly over the past thirty years. This study concerns how: (1) these broader trends have affected the quantity and quality of labor investments into livestock h...


Turner, M.D.Hiernaux, Pierre H.Y.[Changing access to labor, pastures, and knowledge: the extensification of grazing management in Sudano-Sahelian West Africa]Changing access to labor, pastures, and knowledge: the extensification of grazing management in Sudano-Sahelian West Africa

Selecciona los documentos para visualizarlos

Nombre del archivo Ver recurso