Estimating vegetative productivity gradients around watering points in the rangelands of Northern Senegal based on NOAA AVHRR data

References

• Adriansen , H. K. 2002 . A Fulani without cattle is like a woman without jewellery: a study of pastoralists in Ferlo, Senegal. Copenhagen, Geographica Hafniensia All.
   Google Scholar
• Alissoutin , R. L. 1997 . Pond Management in the Podor Department, Senegal. International Institute for Environment and Development (IIED), Drylands Programme, Issue Paper No 72.
   Google Scholar
• Andrew , M. H. 1988 . Grazing Impact in Relation to Livestock Watering points. . Trends Ecology and Evolution , 3 ( 12 ) : 336 – 339 .
   PubMedGoogle Scholar
• Andrew , M. H. and Lange , R. T. 1986a . Development of a New Piosphere in Arid Chenopod Shrubland Grazed by Sheep: I. . Changes to the Soil Surface. Australian Journal of Ecology , 11 : 395 – 409 .
   Google Scholar
• Andrew , M. H. and Lange , R. T. 1986b . Development of a New Piosphere in Arid Chenopod Shrubland Grazed by Sheep: 2. . Changes to the Vegetation. Australian Journal of Ecology , 11 : 411 – 424 .
   Google Scholar
• Ba , C. 1986 . Les Peuls du Sénégal, étude geographique. Dakar, Les Nouvelles Editions Africaines.
   Google Scholar
• Barrell , H. 1982 . Le Ferlo des forages: Gestion ancienne et actuelle de l'espace pastoral. Dakar, ORSTOM.
   Google Scholar
• Bastin , G. N. , Pickup , G. and Pearce , G. 1995 . Utility of AVHRR data for land degradation assessment: a case study. . International Journal of Remote Sensing , 16 ( 4 ) : 651 – 672 .
   Web of Science ®Google Scholar
• Bastin , G. N. , Pickup , G. , Chewings , V. H. and Pearce , G. 1993a . Land Degradation Assessment in Central Australia Using a Grazing Gradient Method. . Rangeland Journal , 15 ( 2 ) : 190 – 216 .
   Google Scholar
• Bastin , G. N. , Sparrow , A. D. and Pearce , G. 1993b . Grazing Gradients in Central Australian Rangelands: Ground Verification of Remote Sensing-Based Approaches. . Rangeland Journal , 15 ( 2 ) : 217 – 233 .
   Google Scholar
• Bastin , G. N. , Tynan , R. W. and Chewings , V. H. 1998 . Implementing satellite-based grazing gradient methods for rangeland assessment in South Australia. . The Rangeland Journal , 20 ( 1 ) : 61 – 76 .
   Google Scholar
• Bégué , A. , Desprat , J. F. , Imbernon , J. and Baret , F. 1991 . Radiation use efficiency of pearl millet in the Sahelian zone. . Agricultural and Forest Meteorology , 56 : 93 – 110 .
   Web of Science ®Google Scholar
• Behnke , R. H. , Scoones , I. and Kerven , C. 1993 . Range Ecology at Disequilibrium-New Models of Natural Variability and Pastoral Adaptation in African Savannas. London : Overseas Development Institute & International . Institute for Environment and Development (IIED)
   Google Scholar
• Chewings , V. H. , Bastin , G. N. and Pickup , G. 1992 . “ Remote Sensing Models for Determining Grazing Impact in Arid Rangelands. ” . In Proceedings of the 6th Australasian Remote Sensing Conference. Wellington (New Zealand). 169 – 179 .
   Google Scholar
• Cihlar , J. , Manak , D. and D'Ion , M. 1994 . Evaluation of Compositing Algorithms for AVHRR Data Over Land. . IEEE Transactions on Geoscience and Remote Sensing , 32 ( 2 ) : 427 – 437 .
   Web of Science ®Google Scholar
• Fatchen , T. J. and Lange , R. T. 1979 . “ Piosphere Pattern and Dynamics in a Chenopod Pasture Grazed by Cattle. ” . In Studies of the Australian Arid Zone IV. Chenopod Shrublands. Edited by: Graetz , R. D. and Howes , K. M. W. 160 – 169 . Melbourne : CSIRO . Division of Land Resources Management
   Google Scholar
• Freudenberger , M. S. and Freudenberger , K. S. 1993 . Pastoralism in Peril: Pressures on Grazing land in Senegal. IIED Drylands Programme, Pastoral Land Tenure Series 4.
   Google Scholar
• Graetz , R. D. and Ludwig , J. A. 1978 . A Method for the Analysis of piosphere Data Applicable to Range Assessment. . Australian Rangeland Journal , 2 : 126 – 136 .
   Google Scholar
• Hanan , N. P. , Prevost , Y. , Diouf , A. and Diallo , O. 1991 . Assessment of Desertification Around Deep Wells in the Sahel using Satellite Imagery. . Journal of Applied Ecology , 28 : 173 – 186 .
   Web of Science ®Google Scholar
• Hiernaux , P. 2000 . “ Implications of the ‘New Rangeland Paradigm’ for natural resource management. ” . In The Sahel. SEREIN Occasional papers 11. Institute of Geography, University of Copenhagen. Edited by: Adriansen , H. , Reenberg , A. and Nielsen , I. 113 - 142 in
   Google Scholar
• Holben , B. N. 1986 . Characteristics of maximum-value composite images from temporal AVHRR data. . International Journal of Remote Sensing , 7 ( 11 ) : 1417 – 1434 .
   Web of Science ®Google Scholar
• Huete , A. R. 1988 . A Soil-Adjusted Vegetation Index (SAVI): . Remote Sensing of Environment , 25 : 295 – 309 .
   Web of Science ®Google Scholar
• Hulme , M. 2001 . Climatic perspectives on Sahelian desiccation: 1973–1998. . Global Environmental Change , 11 : 19 – 29 .
   Web of Science ®Google Scholar
• Juul , K. 1996 . Post Drought Migration and Technological Innovations among Fulani Herders in Senegal: the Triumph of the Tube! IIED Drylands Programme, Issue Paper 64.
   Google Scholar
• Kumar , M. and Montieth , J. L. 1981 . “ Remote Sensing of crop growth. ” . In Plants and Daylight Spectrum. Edited by: Smith , M. 133 – 144 . London : Academic Press .
   Google Scholar
• Lange , R. T. 1969 . The piosphere: Sheep Track and Dung Patterns. . Journal of Range Management , 22 : 396 – 400 .
   Google Scholar
• Matheson , W. and Ringrose , S. 1994 . Assessment of degradation features and their development into the post-drought period in the West-Central Sahel using Landsat MSS. . Journal of Arid Environments , 26 ( 2 ) : 181 – 199 .
   Web of Science ®Google Scholar
• Pearson , J. T. , Sparrow , A. D. and Lange , R. T. 1990 . Prolonged Exposure to Sheep Grazing Reduces the Palatability of Australian Saltbush populations. . Australian journal of Ecology , 15 : 337 – 344 .
   Google Scholar
• Pickup , G. 1994 . Modelling Patterns of Defoliation by Grazing Animals in Rangelands. . Journal of Applied Ecology , 31 : 231 – 246 .
   Google Scholar
• Pickup , G. and Chewings , V. H. 1988 . Estimating the Distribution of Grazing and Patterns of Cattle Movement in a Large Arid Zone Paddock: An Approach using Animals Distribution models and Landsat Imagery. . International Journal of Remote Sensing , 9 ( 9 ) : 1469 – 1490 .
   Web of Science ®Google Scholar
• Pickup , G. and Chewings , V. H. 1994 . A Grazing Gradient Approach to Land Degradation Assessment in Arid Areas from Remotely-sensed Data. . International Journal of Remote Sensing , 15 ( 4 ) : 597 – 617 .
   Google Scholar
• Prince , S. D. and Goward , S. N. 1995 . Global primary production: a remote sensing approach. . Journal of biogeography , 22 : 815 – 835 .
   Web of Science ®Google Scholar
• Prins , E. 1997 . “ Natural Resources and Resource Utilization in Ferlo Faunal Reserves-a Baseline Mapping Report on Natural Resources and Resource Utilization. ” . In The Sahel: Natural Resource Management Projects: Energy Provision; Decentralisation, Empowerment and Capacity Building. SEREIN Occasional Papers No 5, Institute of Geography, University of Copenhagen. Edited by: Reenberg , A. , Nielsen , I. and Secher-Mar-cussen , H. 37 – 45 .
   Google Scholar
• Rao , C. R. N. and Chen , J. 1995 . Inter-satellite calibration linkages for the visible and near-infrared channels of the Advanced Very High Resolution Radiometer on the NOAA-7, -9 and -11 spacecraft. . International Journal of Remote Sensing , 16 : 1931 – 1942 .
   Web of Science ®Google Scholar
• Rao , C. R. N. and Chen , J. 1996 . Post-Launch Calibration of the Visible and Near-infrared Channels of the Advanced Very High Resolution Radiometer on the NOAA-14 spacecraft. . International Journal of Remote Sensing , 14 : 2743 – 2747 .
   Google Scholar
• Rasmussen , K. 1999 . Land degradation in the Sahel-Sudan. The conceptual basis. Special Issue, Danish Journal of Geography (2): 151 -159.
   Google Scholar
• Rasmussen , M. S. 1998 . Developing simple, operational, consistent NDVI-vegetation models by applying environmental and climatic information. . Part I. Assessment of Net Primary Production. International Journal of Remote Sensing , 19 : 97 – 117 .
   Google Scholar
• Thomas , D. S. G. 1993 . Sandstorm in a teacup: understanding desertification. . Geographical Journal , 159 : 318 – 331 .
   Web of Science ®Google Scholar
• Touré , O. 1990 . Where herders don't herd anymore: -Experience from the Ferlo, northern Senegal. IIED Drylands Programme, Issue Paper No 22.
   Google Scholar
• Turner , M. D. 1998a . Long-term effects of daily grazing orbits on nutrient availability in Sahelian West Africa: 1. . Gradients in the chemical composition of rangeland soils and vegetation. Journal of Biogeography , 25 ( 4 ) : 669 – 682 .
   Google Scholar
• Turner , M. D. 1998b . Long-term effects of daily grazing orbits on nutrient availability in Sahelian West Africa: Effects of a phosphorus gradient on spatial patterns of annual grassland production. . Journal of Biogeography , 25 ( 4 ) : 683 – 694 .
   Google Scholar
• Williams , M. A. J. and Balling , R. R. Jr. 1996 . Interactions of Desertification and Climate. London : Edward Arnold .
   Google Scholar